
{"id":1828,"date":"2019-06-01T10:56:53","date_gmt":"2019-06-01T13:56:53","guid":{"rendered":"http:\/\/eliezerladeira.com.br\/blog\/?p=1828"},"modified":"2019-06-01T10:57:05","modified_gmt":"2019-06-01T13:57:05","slug":"exercicios-de-corrente-eletrica","status":"publish","type":"post","link":"https:\/\/eliezerladeira.com.br\/blog\/exercicios-de-corrente-eletrica\/","title":{"rendered":"Exerc\u00edcios de Corrente El\u00e9trica"},"content":{"rendered":"\n<p><strong>Quest\u00e3o 1.<\/strong> UERJ &#8211; 2019<\/p>\n<p>Resistores \u00f4hmicos id\u00eanticos foram associados em quatro circuitos distintos e submetidos \u00e0 mesma tens\u00e3o U<sub>A,B<\/sub>. Observe os esquemas:<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-1831\" src=\"http:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/uerj2019corrente.jpg\" alt=\"\" width=\"630\" height=\"346\" srcset=\"https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/uerj2019corrente.jpg 630w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/uerj2019corrente-600x330.jpg 600w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/uerj2019corrente-300x165.jpg 300w\" sizes=\"(max-width: 630px) 100vw, 630px\" \/><\/p>\n<p>Nessas condi\u00e7\u00f5es, a corrente el\u00e9trica de menor intensidade se estabelece no seguinte circuito:<\/p>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p>a) I<br \/>b) II<br \/>c) III<br \/>d) IV<\/p>\n<hr \/>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>Sendo os resistores \u00f4hmicos, podemos aplicar a lei de Ohm nos 4 circuitos propostos, ou seja:<\/p>\n<p>U<sub>A,B<\/sub> = R<sub>eq<\/sub>.i<\/p>\n<p>Analisando essa rela\u00e7\u00e3o, conclu\u00edmos que, se a tens\u00e3o nos terminais AB \u00e9 a mesma para todos os circuitos, ent\u00e3o ter\u00e1 menor corrente aquele que tiver maior resist\u00eancia equivalente.<\/p>\n<p>Portanto, precisamos calcular a resist\u00eancia equivalente em cada circuito.<\/p>\n<p>I) Temos quatro resistores associados em paralelo. Desta forma, a resist\u00eancia equivalente ser\u00e1 encontrada fazendo:<\/p>\n<p><img decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAALMAAACJCAYAAABn9Qk4AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAABEsZUXFwAABR1JREFUeNrt3T9IVVEcwPFDRIRIm0SDtIiDRGtIuIY8IlpEHBoiCJGGEEEiIhqCaBQXh3g8oiVEnFwinBxaRBoiWiTCtUEcRAT7\/bjHvF6vf55\/7vv9zvt+4Afv3jv4O\/f93vXce947J4Sz65V4JbESfLCWL\/kYyuejxFOJHSfFbC1f8jGYj5ditpov+RjKh2ImH4qZN4t8KGbeLPKhmHmzyIdiJh+KmWImH4qZN4t8KGbeLPI57R8phvUitpQv+aRVXwD4V0w+oHgoZgv9JWv9OYqHYubKTD6tvQpeVFhrz0X8pyCf6vOhm8GVkG4G3QzyoZgpZvIBbxb5AO1qM37C1iS+SSxIdNEe8vGWT084OF\/BW4n3TgvZWnvIp8J8Hkp8Kuwblqg7LWZr7SGfCvN5LTFR2PdG4rnTYrbWHvKpMJ\/PEg9y29ckfkpcd1rM1tpDPhXm80vihsRliUGJZYkhxzd\/1tpDPhXlc0liO+wfOh5wXMjW2kM+FeZzR2Ixt93v+CmGxfaQT4X5jJTcNX6RuOm0mK21h3wqzGcqZFOJhsKno+G0mK21h3wqzGdOolay\/6tEX8n+dxLrEr8lbhWOTUr8icdfxI59d8Unp9n2kE9C+fyVuFqyXz8dCyWfoifxtT4D\/JA79lJiLL7uCNks6JstODnNtId82jQffXSyltu+JzEbX3fFq3AxmcUAGDQcDv76o5471ijp2Dc4bbDoscT0IcdGYzej2CUZ5bTBIn0eOH\/EVXu3y6FDkRPxRrDGaYNV4xKrEluxm3El7tdRHB1f34jHH8WOfQenDN5pka9zGpCCwXilBgAAAAAAAAAAAGBVb8i+cL\/iLO\/7gVkqUfAxZL\/V8lQYnRI\/KGYcxlNhzITsZ14UM1wX892Q\/SgyUMzwXMz6FdTvYW\/uBYoZbotZp0N45rRrBIr5v9sSS477+aCY\/9MlBHooZqRQzEms8gmKOaWcQWFQzDjdv2+KGQAAAGhdf5xHagC4ClYR1toD0M0AAAAAAM82442WLo+m3wnWNdi6aA+80S+zF+fDeBv8LgifWnvQhIcSnwr7dAWpOu2BN69DttxZ3puQLSlMe+CKLqbzILeta\/n9lLhOe+CNrnuta2NfDtlKUcsSQ7QH3uiClNth\/9DxAO2BR7qM8GJuu9\/5XX9q7UETRkru8r+EvamtaA\/cmArZVLWhcDVr0B54MydRK9mvM2j2lezXedx0XezfErcKxyYl\/sTjL+KNWLfx9iAhfyWuluzXq9lCyVXvSXytz2w\/5I69lBiLrztCNsv+pvH2oE3po6613PY9idn4uitehYvFs8hpg0U6HFz89Uc9d6xRciNGPxUmPZaYPuTYaOxmFLsko5w2WKTPb+ePuGrvdjl06Hgi3gjWOG2walxiVWIrdjOuxP066qbfh9iIxx\/FG7EOThm80yJf5zQgBYPxSg0AAAAAAAAAAAAAJ8NcckgCc8khGcwlh2QwlxySwVxySAZzySEJzCWHZDCXHJLBXHJIBnPJIRnMJYcDvA4HM5cc9mE4GMlgOBjJYDgYyah6OHjnBAGcCsPBSIK34eCdMwQS14rhYAoPF4LhYCSD4WAkI7Wl0tDGUlsqDTiWl6XS7nMDieN4WCqtU+IHxYzjeFgqbSZ2gyhmHMn6Uml3401roJhxElaXStM8voe9Z+MUM861uKpcKk0fFz7LbVPMODdVLpV2W2KpsI9ihkv6E68eihkp4AtLSL7AAYoZoJjREv8AZsYGiN\/p3A4AAAJhdEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1mcmFjPjxtbj4xPC9tbj48bXN1Yj48bWk+UjwvbWk+PG1yb3c+PG1pPmU8L21pPjxtaT5xPC9taT48L21yb3c+PC9tc3ViPjwvbWZyYWM+PG1vPj08L21vPjxtZnJhYz48bW4+MTwvbW4+PG1pPlI8L21pPjwvbWZyYWM+PG1vPis8L21vPjxtZnJhYz48bW4+MTwvbW4+PG1pPlI8L21pPjwvbWZyYWM+PG1vPis8L21vPjxtZnJhYz48bW4+MTwvbW4+PG1pPlI8L21pPjwvbWZyYWM+PG1vPis8L21vPjxtZnJhYz48bW4+MTwvbW4+PG1pPlI8L21pPjwvbWZyYWM+PG1zcGFjZSBsaW5lYnJlYWs9Im5ld2xpbmUiLz48bWZyYWM+PG1uPjE8L21uPjxtc3ViPjxtaT5SPC9taT48bXJvdz48bWk+ZTwvbWk+PG1pPnE8L21pPjwvbXJvdz48L21zdWI+PC9tZnJhYz48bW8+PTwvbW8+PG1mcmFjPjxtbj40PC9tbj48bWk+UjwvbWk+PC9tZnJhYz48bXNwYWNlIGxpbmVicmVhaz0ibmV3bGluZSIvPjxtc3ViPjxtaT5SPC9taT48bXJvdz48bWk+ZTwvbWk+PG1pPnE8L21pPjwvbXJvdz48L21zdWI+PG1vPj08L21vPjxtZnJhYz48bWk+UjwvbWk+PG1uPjQ8L21uPjwvbWZyYWM+PC9tYXRoPu6gnSwAAAAASUVORK5CYII=\" alt=\"1 sobre R com e q subscrito fim do subscrito igual a 1 sobre R mais 1 sobre R mais 1 sobre R mais 1 sobre R 1 sobre R com e q subscrito fim do subscrito igual a 4 sobre R R com e q subscrito fim do subscrito igual a R sobre 4\" width=\"179\" height=\"137\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb4\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb4\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>II) Nesse circuito, os resistores est\u00e3o associados em s\u00e9rie e paralelo (associa\u00e7\u00e3o mista). Temos tr\u00eas ramos com dois resistores associados em s\u00e9rie em cada ramo.<\/p>\n<p>Come\u00e7amos encontrando a resist\u00eancia equivalente da s\u00e9rie. Assim, temos:<\/p>\n<p><img decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R com s \u00e9 r i e subscrito fim do subscrito igual a R mais R igual a 2 R\" width=\"134\" height=\"17\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbs\u00ab\/mi\u00bb\u00abmi\u00bb\u00a7#233;\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Desta forma, o circuito pode ser substitu\u00eddo por um circuito em paralelo com um resistor de 2R em cada um dos 3 ramos.<\/p>\n<p>Podemos agora calcular a resist\u00eancia equivalente da associa\u00e7\u00e3o em paralelo que ser\u00e1 a resist\u00eancia equivalente do circuito:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"1 sobre R com e q subscrito fim do subscrito igual a numerador 1 sobre denominador 2 R fim da fra\u00e7\u00e3o mais numerador 1 sobre denominador 2 R fim da fra\u00e7\u00e3o mais numerador 1 sobre denominador 2 R fim da fra\u00e7\u00e3o 1 sobre R com e q subscrito fim do subscrito igual a numerador 3 sobre denominador 2 R fim da fra\u00e7\u00e3o R com e q subscrito fim do subscrito igual a numerador 2 R sobre denominador 3 fim da fra\u00e7\u00e3o\" width=\"173\" height=\"137\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>III) Esse tamb\u00e9m \u00e9 um circuito misto com dois resistores associados em paralelo e em s\u00e9rie com um terceiro resistor.<\/p>\n<p>Encontrando a resist\u00eancia equivalente do paralelo, temos:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"1 sobre R com p a r a l e l o subscrito fim do subscrito igual a 1 sobre R mais 1 sobre R 1 sobre R com p a r a l e l o subscrito fim do subscrito igual a 2 sobre R R com p a r a l e l o subscrito fim do subscrito igual a R sobre 2\" width=\"137\" height=\"137\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbp\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbp\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbp\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>A resist\u00eancia equivalente do circuito \u00e9 encontrada somando a resist\u00eancia equivalente do paralelo com a resist\u00eancia R, ent\u00e3o temos:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R com e q subscrito fim do subscrito igual a R sobre 2 mais R R com e q subscrito fim do subscrito igual a numerador 3 R sobre denominador 2 fim da fra\u00e7\u00e3o\" width=\"91\" height=\"82\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>IV) Agora temos tr\u00eas resistores em s\u00e9rie associados em paralelo com outros dois resistores em s\u00e9rie. Vamos primeiro encontrar a resist\u00eancia equivalente de cada s\u00e9rie:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R com s e r i e 3 subscrito fim do subscrito igual a R mais R mais R igual a 3 R R com s e r i e 2 subscrito fim do subscrito igual a R mais R igual a 2 R\" width=\"170\" height=\"45\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbs\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbs\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Agora, encontraremos a resist\u00eancia equivalente do circuito calculando a resist\u00eancia equivalente do paralelo:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"1 sobre R com e q subscrito fim do subscrito igual a numerador 1 sobre denominador 3 R fim da fra\u00e7\u00e3o mais numerador 1 sobre denominador 2 R fim da fra\u00e7\u00e3o 1 sobre R com e q subscrito fim do subscrito igual a numerador 2 mais 3 sobre denominador 6 R fim da fra\u00e7\u00e3o R com e q subscrito fim do subscrito igual a numerador 6 R sobre denominador 5 fim da fra\u00e7\u00e3o\" width=\"127\" height=\"137\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00abmrow\u00bb\u00abmn\u00bb6\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb6\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Agora que encontramos as resist\u00eancias equivalentes de cada circuito, temos que identificar qual \u00e9 a maior. Sendo:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R sobre 4 menor que numerador 2 R sobre denominador 3 fim da fra\u00e7\u00e3o menor que numerador 6 R sobre denominador 5 fim da fra\u00e7\u00e3o menor que numerador 3 R sobre denominador 2 fim da fra\u00e7\u00e3o\" width=\"154\" height=\"35\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb4\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb\u00a7#60;\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb\u00a7#60;\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb6\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb\u00a7#60;\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Conclu\u00edmos que no circuito III, que apresenta a maior resist\u00eancia, teremos a menor intensidade de corrente.<\/p>\n<p><strong>Alternativa: c) III<\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 2. <\/strong>Enem &#8211; 2018<\/p>\n<p>Alguns peixes, como o poraqu\u00ea, a enguia-el\u00e9trica da Amaz\u00f4nia, podem produzir uma corrente el\u00e9trica quando se encontram em perigo. Um poraqu\u00ea de 1 metro de comprimento, em perigo, produz uma corrente em torno de 2 amp\u00e8res e uma voltagem de 600 volts.<\/p>\n<p>O quadro apresenta a pot\u00eancia aproximada de equipamentos el\u00e9tricos.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1832 lazyload\" data-src=\"http:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/enem2018corrente-cke.jpg\" alt=\"\" width=\"630\" height=\"234\" data-srcset=\"https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/enem2018corrente-cke.jpg 630w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/enem2018corrente-cke-600x223.jpg 600w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/enem2018corrente-cke-300x111.jpg 300w\" data-sizes=\"(max-width: 630px) 100vw, 630px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 630px; --smush-placeholder-aspect-ratio: 630\/234;\" \/><\/p>\n<p>O equipamento el\u00e9trico que tem pot\u00eancia similar \u00e0quela produzida por esse peixe em perigo \u00e9 o<\/p>\n<p>a) A exaustor.<br \/>b) computador.<br \/>c) aspirador de p\u00f3.<br \/>d) churrasqueira el\u00e9trica.<br \/>e) secadora de roupas.<\/p>\n<hr \/><\/div>\n<\/div>\n<\/div>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>Primeiro precisamos descobrir qual \u00e9 o valor da pot\u00eancia produzida pelo peixe. Para isso, vamos usar a f\u00f3rmula da pot\u00eancia e substituir os valores apresentados:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"letra mai\u00fascula p cursiva igual a U. i letra mai\u00fascula p cursiva igual a 600.2 igual a 1200 espa\u00e7o W\" width=\"151\" height=\"38\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bb\u00a7#8472;\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bbU\u00ab\/mi\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmi\u00bb\u00a7#8472;\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb600\u00ab\/mn\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb1200\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmi\u00bbW\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Comparando com os dados da tabela, identificamos que essa pot\u00eancia equivale a uma churrasqueira el\u00e9trica.<\/p>\n<p><strong>Alternativa: d) churrasqueira el\u00e9trica.<\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 3. <\/strong>PUC\/RJ &#8211; 2018<\/p>\n<p>Em um circuito el\u00e9trico, dois resistores id\u00eanticos, de resist\u00eancia R, s\u00e3o instalados em paralelo e ligados, em s\u00e9rie, a uma bateria e a um terceiro resistor, id\u00eantico aos anteriores. Nesta configura\u00e7\u00e3o, a corrente que flui pelo circuito \u00e9 I<sub>0<\/sub>. Ao substituir esse terceiro resistor em s\u00e9rie por outro, de resist\u00eancia 2R, a nova corrente no circuito ser\u00e1<\/p>\n<p>a) I<sub>0<\/sub><br \/>b) 3I<sub>0<\/sub>\/5<br \/>c) 3I<sub>0<\/sub>\/4<br \/>d) I<sub>0<\/sub>\/2<br \/>e) I<sub>0<\/sub>\/4<\/p>\n<hr \/><\/div>\n<\/div>\n<\/div>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>Na primeira situa\u00e7\u00e3o, a resist\u00eancia equivalente ser\u00e1 dada por:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R com e q 1 subscrito fim do subscrito igual a R sobre 2 mais R R com e q 1 subscrito fim do subscrito igual a numerador 3 R sobre denominador 2 fim da fra\u00e7\u00e3o\" width=\"99\" height=\"82\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Na segunda situa\u00e7\u00e3o, a resist\u00eancia do resistor em s\u00e9rie passa para 2R, logo a resist\u00eancia equivalente nesta nova situa\u00e7\u00e3o ser\u00e1 igual a:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"R com e q 2 subscrito fim do subscrito igual a R sobre 2 mais 2 R R com e q 2 subscrito fim do subscrito igual a numerador R mais 4 R sobre denominador 2 fim da fra\u00e7\u00e3o igual a numerador 5 R sobre denominador 2 fim da fra\u00e7\u00e3o\" width=\"155\" height=\"82\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbq\u00ab\/mi\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb+\u00ab\/mo\u00bb\u00abmn\u00bb4\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Como n\u00e3o houve mudan\u00e7a no valor da bateria que alimenta o circuito, ent\u00e3o a tens\u00e3o \u00e9 a mesma em ambas as situa\u00e7\u00f5es. Considerando a lei de Ohm, temos a seguintes igualdades:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"U igual a numerador 3 R sobre denominador 2 fim da fra\u00e7\u00e3o I com 0 subscrito igual a numerador 5 R sobre denominador 2 fim da fra\u00e7\u00e3o I I igual a numerador diagonal para cima risco 2 sobre denominador 5 diagonal para cima risco R fim da fra\u00e7\u00e3o. numerador 3 diagonal para cima risco R sobre denominador diagonal para cima risco 2 fim da fra\u00e7\u00e3o I com 0 subscrito igual a 3 sobre 5 I com 0 subscrito\" width=\"149\" height=\"86\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bbU\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmsub\u00bb\u00abmi\u00bbI\u00ab\/mi\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmi\u00bbI\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmi\u00bbI\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmenclose notation=\u00a8updiagonalstrike\u00a8\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/menclose\u00bb\u00abmrow\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00abmenclose notation=\u00a8updiagonalstrike\u00a8\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/menclose\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmenclose notation=\u00a8updiagonalstrike\u00a8\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/menclose\u00bb\u00ab\/mrow\u00bb\u00abmenclose notation=\u00a8updiagonalstrike\u00a8\u00bb\u00abmn\u00bb2\u00ab\/mn\u00bb\u00ab\/menclose\u00bb\u00ab\/mfrac\u00bb\u00abmsub\u00bb\u00abmi\u00bbI\u00ab\/mi\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb3\u00ab\/mn\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00abmsub\u00bb\u00abmi\u00bbI\u00ab\/mi\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00ab\/msub\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p><strong>Alternativa: b) 3I<sub>0<\/sub>\/5<\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 4. <\/strong>Enem &#8211; 2017<\/p>\n<p>Em algumas resid\u00eancias, cercas eletrificadas s\u00e3o utilizadas com o objetivo de afastar poss\u00edveis invasores. Uma cerca eletrificada funciona com uma diferen\u00e7a de potencial el\u00e9trico de aproximadamente 10 000 V. Para que n\u00e3o seja letal, a corrente que pode ser transmitida atrav\u00e9s de uma pessoa n\u00e3o deve ser maior do que 0,01 A. J\u00e1 a resist\u00eancia el\u00e9trica corporal entre as m\u00e3os e os p\u00e9s de uma pessoa \u00e9 da ordem de 1 000 \u03a9.<\/p>\n<p>Para que a corrente n\u00e3o seja letal a uma pessoa que toca a cerca eletrificada, o gerador de tens\u00e3o deve possuir uma resist\u00eancia interna que, em rela\u00e7\u00e3o \u00e0 do corpo humano, \u00e9:<\/p>\n<p>a) praticamente nula.<br \/>b) aproximadamente igual.<br \/>c) milhares de vezes maior.<br \/>d) da ordem de 10 vezes maior.<br \/>e) da ordem de 10 vezes menor.<\/p>\n<hr \/><\/div>\n<\/div>\n<\/div>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>Para essa quest\u00e3o iremos usar a equa\u00e7\u00e3o de um gerador, pois queremos comparar a resist\u00eancia interna do gerador com a resist\u00eancia do corpo humano. Essa equa\u00e7\u00e3o \u00e9 dada por:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"U igual a \u00e9psilon menos r. i\" width=\"74\" height=\"13\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bbU\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bb\u00a7#949;\u00ab\/mi\u00bb\u00abmo\u00bb-\u00ab\/mo\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Sendo:<\/p>\n<p>U: a diferen\u00e7a de potencial do circuito (V)<br \/>\u03b5: for\u00e7a eletromotriz (V)<br \/>r: resist\u00eancia interna do gerador(\u03a9)<br \/>i: corrente (A)<\/p>\n<p>O valor de U pode ser encontrado usando a lei de Ohm, ou seja, U = R.i. Note que essa resist\u00eancia \u00e9 a do circuito, que nesse caso \u00e9 igual a resist\u00eancia corporal.<\/p>\n<p>Substituindo os valores do problema na equa\u00e7\u00e3o do gerador, temos:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAANwAAACGCAYAAAC2T+QQAAAACXBIWXMAAA7EAAAOxAGVKw4bAAAABGJhU0UAAABBwf\/jmAAAB89JREFUeNrtnU+kXUccx8fzRBZVqiKiixDxVFWUiOoiqlRURTylorqoChHVRRehi4qqyCa6iIhSVRERj6quKpuKiKoKEfFERaiuuohS0UVcEW5n3Incd945787MmX\/n\/D4ffrx37u\/n\/mbOzJs58+Z8R6nNTLRNtf2t7aa2q9p2KHceaVtS42Xs5YOM7NV2p3HtjLazHvHrI6+fdZoJxGJV25XGtaPaLlI1APH5UtvJxrWvtH3mEf95otz22OmtmfLe8pzmKs\/8T9jvmDTKk7J8IJAftB2Z+\/15bfe07fSIX+34bOpgXeyweRyyz08faXsnUfnNs+vXtoP7lA\/Am\/vadmlbtg36trb3PeNfSpDXBW2fZCr\/ewXKBwIxI8eTxohz0DP+UaK8\/tW2zdE\/dCRdlH+q8oFQXtd2fe73N5T76mRbfKyOsL\/F73qG8vt+DuDFB2rzauQv2nb3iI+Beaa8Uqj8OcoHQjmv7XjjmhnlLnnEH0uQl5nW\/pip\/McKlA+E8pO2d1uuX9P2Ssf00CU+xjPcXW0H7M8f2j8EucqfunwgFLMwsb3lumncVx06XFd8DPap2b8FHmr7InP5c5QPAAAAAAAAAAAAAAAAAAAAAAAAAABAHCvaTqnNUnlbYXRPvlEzDUtj39prqf1UwdiQekp5T0LLXdO9y0F17eOymr0TN\/UohHl9Z1546LC9ltpPFYwNqadQXL4rtNw13bscVNs+XB2NwND5luvn1OwN6VR+fXKJGTvN2FimkXOv6d7loOr24epo3sQ+1HL9LbXxLe3Yfn1yiRlbQ4cLzb2mexfCIg3RQbUPV8cuNS1z7UFCvz65xIydOtZlqB6ny3eF5l7TvQthkYboUNqHl+OTLT57nNCvTy4xY2sY4UJzr+nehbBIQ3RQ7SNGh5sk9OuTS8zY2jvcpPJ7l0pDdHDtw9XxQcdQu70x1Mb265NLzNgappShudd073wJ0QittX14L5q0afwfanmgjunXJ5eYsbUsmoTkXtO98yVEI7Tq9uHqaObQ37Vcv6g2LpfG9uuTS8zYGjpcaO413TtfQjRCq24fPg3JDO3mOKtlO+waGbsbGfzapmMusWs2bjXwe2vrcKG5l7x3fXHRCB1E+wh5vnhB2\/f24dE8yJotL89l8GvLzyW2q0Jdvze0nvp0tEXf5ZN7DfeuLy4aoVLaxyBYU6goA+0jC6+pmXT6MlUBtI\/0mAMVd1INQPsAAAAAAAAAAAAAAAAAAADoSUoNxBpzGrIu4xg1OMWRUgOxxpyGrMs4Rg1OscTWQKwxpyHrMo5dg5MOZ8mtPZgypyHrMtamseirEQmOlRuiz4cuY3wRndo0Fn01IsGxcnNrD6bMaci6jLVpLPpqREKExj0ZWE5D1mWsSWMxRCMSHCs3RJ8PXcb4U8qaNBZDNCLBY4Eil\/Zg6pyGrMtYk8ZiiEYkOFZuTu3B1DkNWZexJo3FEI1I8HhAzqU9mCOnoeoyun5XDo1FF41I8HjeapJLezBHTkPVZXT9rhwaiy4akQBiQGMRIBNoLAJkBI1FAAAAAAAAAAAAAAAAAAAASINEnUM0L+usOxFI1DlE87LOuhs90nUO0bysp+5EIF3nEM3LeupOBEPVOUTzMr5AUawOV3POxZGuc4jmZT11J77DSdA5HKPmZarZQOq6E8FQdQ7RvKx3SllzzlUsmkjWOUTzsp66E4F0nUM0L+upOzFI1jlE87KuuhOBRJ1DNC\/rrDtodDp0DgEygM4hQEbQOQQAAAAAAAAAAAAAAAAAAACAMryp7Vf1bHOreU9qTwY\/9BJBHOZFRLMv84CaySqY\/ZnmPbh7auP2sdh+BvQSQRy3OkYfo2d4NqEfeokgki6RGTM63U7oh14iiORPbftbru9WG1W7YvuhlwgiMVO7v+xCx5K1w3Y0epzQD71EEIvpHEb3YmLNKC7vVZt1KWP6oZcIMIfRM7mZ0A+9RIDG4sXphH7oJQLMcUbNpBxS+aGXCCK5Zhv\/0+md6RTmRM0jif2UQi8RBPK2bfhmEeM\/NZPf25fBz1BSL7HUdrYmNRyJbFTgLmn7R81WiM19Mwtdr9I9IAYlt7O1zTBKHolsDt383fo9nZWYP3qfqtni1UGaC\/Sl1Ha2ts9LHol8yo6AW81+7o+9MeQ+5lcipbazNSl5JPLL2tYd6srsHFoZc2PIfczvkAmtg1Lb2ZqUPBL5graPHer4ZzvSjZbcx\/xKpNR2NteRVqn0RyL\/Yf8guIxwu8baEHId8zsdmKWgxHY2nw6X+khkl+1zO+xsa7SUOOZX4pSyi9Tb2ZqUPBL5UYfvPCeV2y6iwVLimF\/YuLhwOqNfySORb3T4zo9uZtr54phveIljfuEZqbezNSl5JPIJ1b2rx\/yj\/LcFHXIUlDjmVyIlt7M1KXUk8pKd7p5rXDe7S+5oOyqhIeQ85lcyJbezNSlxJPLDxnPuNsfPIAF9pOt8YlfsKHCHKgfp061Q6Tqf2MvajisZq6kArfSRrguNpcOBWPpI14XG0uFALH2k60Jj6XAglj7SdaGxdDigw7UwSRRLhwOx9JGuC42lw4FY+kjXhcbS4UAsfaTrQmPpcCAal714a7ajrAbE0uEA5nDZi9fV4Xxk7yS+vwcQjOl0vNkAkAEjHHrXTh0BIDHmfa+dVAMMlf8BmrIUqpIzTTkAAANbdEVYdE1hdGhNTAA8bWF0aCB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCI+PG1pPlI8L21pPjxtbz4uPC9tbz48bWk+aTwvbWk+PG1vPj08L21vPjxtaT4mI3gzQjU7PC9taT48bW8+LTwvbW8+PG1pPnI8L21pPjxtaT5pPC9taT48bXNwYWNlIGxpbmVicmVhaz0ibmV3bGluZSIvPjxtbj4xPC9tbj48bW8+JiN4QTA7PC9tbz48bW4+MDAwPC9tbj48bW8+LjwvbW8+PG1uPjA8L21uPjxtbz4sPC9tbz48bW4+MDE8L21uPjxtbz49PC9tbz48bW4+MTA8L21uPjxtbz4mI3hBMDs8L21vPjxtbj4wMDA8L21uPjxtbz4tPC9tbz48bWk+cjwvbWk+PG1vPi48L21vPjxtbj4wPC9tbj48bW8+LDwvbW8+PG1uPjAxPC9tbj48bXNwYWNlIGxpbmVicmVhaz0ibmV3bGluZSIvPjxtbj4xMDwvbW4+PG1vPj08L21vPjxtbj4xMDwvbW4+PG1vPiYjeEEwOzwvbW8+PG1uPjAwMDwvbW4+PG1vPi08L21vPjxtbj4wPC9tbj48bW8+LDwvbW8+PG1uPjAxPC9tbj48bWk+cjwvbWk+PG1zcGFjZSBsaW5lYnJlYWs9Im5ld2xpbmUiLz48bW4+MDwvbW4+PG1vPiw8L21vPjxtbj4wMTwvbW4+PG1pPnI8L21pPjxtbz49PC9tbz48bW4+MTA8L21uPjxtbz4mI3hBMDs8L21vPjxtbj4wMDA8L21uPjxtbz4mI3hBMDs8L21vPjxtbz4tPC9tbz48bW8+JiN4QTA7PC9tbz48bW4+MTA8L21uPjxtc3BhY2UgbGluZWJyZWFrPSJuZXdsaW5lIi8+PG1pPnI8L21pPjxtbz49PC9tbz48bWZyYWM+PG1uPjk5OTA8L21uPjxtcm93Pjxtbj4wPC9tbj48bW8+LDwvbW8+PG1uPjAxPC9tbj48L21yb3c+PC9tZnJhYz48bW8+PTwvbW8+PG1uPjk5OTwvbW4+PG1vPiYjeEEwOzwvbW8+PG1uPjAwMDwvbW4+PG1pPiYjeDNBOTs8L21pPjwvbWF0aD6OHOKyAAAAAElFTkSuQmCC\" alt=\"R. i igual a \u00e9psilon menos r i 1 espa\u00e7o 000.0 v\u00edrgula 01 igual a 10 espa\u00e7o 000 menos r.0 v\u00edrgula 01 10 igual a 10 espa\u00e7o 000 menos 0 v\u00edrgula 01 r 0 v\u00edrgula 01 r igual a 10 espa\u00e7o 000 espa\u00e7o menos espa\u00e7o 10 r igual a numerador 9990 sobre denominador 0 v\u00edrgula 01 fim da fra\u00e7\u00e3o igual a 999 espa\u00e7o 000 \u00f3mega mai\u00fasculo\" width=\"220\" height=\"134\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmi\u00bb\u00a7#949;\u00ab\/mi\u00bb\u00abmo\u00bb-\u00ab\/mo\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb01\u00ab\/mn\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb10\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb-\u00ab\/mo\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb01\u00ab\/mn\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmn\u00bb10\u00ab\/mn\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb10\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb-\u00ab\/mo\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb01\u00ab\/mn\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb01\u00ab\/mn\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb10\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmo\u00bb-\u00ab\/mo\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb10\u00ab\/mn\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb9990\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb01\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb999\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmi\u00bb\u00a7#937;\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Agora precisamos descobrir quantas vezes a resist\u00eancia interna do gerador deve ser maior que a resist\u00eancia corporal. Para isso, vamos dividir uma pela outra, isto \u00e9:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"r sobre R igual a numerador 999 espa\u00e7o 000 sobre denominador 1 espa\u00e7o 000 fim da fra\u00e7\u00e3o igual a 999 r igual a 999 espa\u00e7o R\" width=\"155\" height=\"59\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb999\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00abmrow\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb999\u00ab\/mn\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb999\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Portanto, a resist\u00eancia interna do gerador dever\u00e1 ser em torno de 1 000 vezes maior que a resist\u00eancia do corpo da pessoa.<\/p>\n<p><strong>Alternativa: c) milhares de vezes maior.<\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 5. <\/strong>Enem &#8211; 2016<\/p>\n<p>Tr\u00eas l\u00e2mpadas id\u00eanticas foram ligadas no circuito esquematizado. A bateria apresenta resist\u00eancia interna desprez\u00edvel, e os fios possuem resist\u00eancia nula. Um t\u00e9cnico fez uma an\u00e1lise do circuito para prever a corrente el\u00e9trica nos pontos: A, B, C, D e E; e rotulou essas correntes de I<sub>A<\/sub>, I<sub>B<\/sub>, I<sub>C<\/sub>, I<sub>D<\/sub> e I<sub>E<\/sub>, respectivamente.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1833 lazyload\" data-src=\"http:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/correnteenem2016.jpg\" alt=\"\" width=\"630\" height=\"512\" data-srcset=\"https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/correnteenem2016.jpg 630w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/correnteenem2016-300x244.jpg 300w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/05\/correnteenem2016-600x488.jpg 600w\" data-sizes=\"(max-width: 630px) 100vw, 630px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 630px; --smush-placeholder-aspect-ratio: 630\/512;\" \/><\/p>\n<p>O t\u00e9cnico concluiu que as correntes que apresentam o mesmo valor s\u00e3o<\/p>\n<p>a) I<sub>A<\/sub> = I<sub>E<\/sub> e I<sub>C<\/sub> = I<sub>D<\/sub>.<br \/>b) I<sub>A<\/sub> = I<sub>B<\/sub> = I<sub>E<\/sub> e I<sub>C<\/sub> = I<sub>D<\/sub>.<br \/>c) I<sub>A<\/sub> = I<sub>B<\/sub>, apenas.<br \/>d) I<sub>A<\/sub> = I<sub>B<\/sub> = I<sub>E<\/sub>, apenas.<br \/>e) I<sub>C<\/sub> = I<sub>B<\/sub>, apenas.<\/p>\n<hr \/>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>No esquema abaixo representamos as correntes que percorrem os diversos ramos do circuito.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-1837 lazyload\" data-src=\"http:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/06\/correnteenem20161.jpg\" alt=\"\" width=\"630\" height=\"366\" data-srcset=\"https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/06\/correnteenem20161.jpg 630w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/06\/correnteenem20161-300x174.jpg 300w, https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/06\/correnteenem20161-600x349.jpg 600w\" data-sizes=\"(max-width: 630px) 100vw, 630px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 630px; --smush-placeholder-aspect-ratio: 630\/366;\" \/><\/p>\n<p>Seguindo o esquema, observamos que I<sub>A <\/sub>e I<sub>B<\/sub> s\u00e3o iguais e que I<sub>c<\/sub> e I<sub>D<\/sub> tamb\u00e9m s\u00e3o iguais.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>Alternativa: a) I<sub>A<\/sub> = I<sub>E<\/sub> e I<sub>C<\/sub> = I<sub>D<\/sub><\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 6. <\/strong>Enem PPL &#8211; 2016<\/p>\n<p>O choque el\u00e9trico \u00e9 uma sensa\u00e7\u00e3o provocada pela passagem de corrente el\u00e9trica pelo corpo. As consequ\u00eancias de um choque v\u00e3o desde um simples susto a morte. A circula\u00e7\u00e3o das cargas el\u00e9tricas depende da resist\u00eancia do material. Para o corpo humano, essa resist\u00eancia varia de 1 000 \u03a9 , quando a pele est\u00e1 molhada, at\u00e9 100 000 \u03a9, quando a pele est\u00e1 seca. Uma pessoa descal\u00e7a, lavando sua casa com \u00e1gua, molhou os p\u00e9s e, acidentalmente, pisou em um fio desencapado, sofrendo uma descarga el\u00e9trica em uma tens\u00e3o de 120 V.<\/p>\n<p>Qual a intensidade m\u00e1xima de corrente el\u00e9trica que passou pelo corpo da pessoa?<\/p>\n<p>a) 1,2 mA<br \/>b) 120 mA<br \/>c) 8,3 A<br \/>d) 833 A<br \/>e) 120 kA<\/p>\n<hr \/><\/div>\n<\/div>\n<\/div>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>Queremos descobrir a corrente m\u00e1xima que percorre o corpo da pessoa. Note que temos dois valores de resist\u00eancia, um para o corpo seco e outra para o corpo molhado.<\/p>\n<p>A corrente m\u00e1xima, visto que a pessoa est\u00e1 como corpo molhado, ser\u00e1 encontrada considerando o valor m\u00ednimo dado para a resist\u00eancia, ou seja 1 000 \u03a9.<\/p>\n<p>Considerando esse valor, vamos aplicar a lei de Ohm:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"U igual a R com m o l h a d o subscrito fim do subscrito. i com m \u00e1 x subscrito fim do subscrito 120 igual a 1 espa\u00e7o 000 espa\u00e7o. espa\u00e7o i com m \u00e1 x subscrito fim do subscrito i com m \u00e1 x subscrito fim do subscrito igual a numerador 120 sobre denominador 1 espa\u00e7o 000 fim da fra\u00e7\u00e3o igual a 0 v\u00edrgula 12 A igual a 120 espa\u00e7o m A\" width=\"243\" height=\"91\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bbU\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmsub\u00bb\u00abmi\u00bbR\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbm\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00abmi\u00bbl\u00ab\/mi\u00bb\u00abmi\u00bbh\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbd\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmsub\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbm\u00ab\/mi\u00bb\u00abmi\u00bb\u00a7#225;\u00ab\/mi\u00bb\u00abmi\u00bbx\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmn\u00bb120\u00ab\/mn\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmsub\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbm\u00ab\/mi\u00bb\u00abmi\u00bb\u00a7#225;\u00ab\/mi\u00bb\u00abmi\u00bbx\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbm\u00ab\/mi\u00bb\u00abmi\u00bb\u00a7#225;\u00ab\/mi\u00bb\u00abmi\u00bbx\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb120\u00ab\/mn\u00bb\u00abmrow\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb12\u00ab\/mn\u00bb\u00abmi\u00bbA\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb120\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmi\u00bbm\u00ab\/mi\u00bb\u00abmi\u00bbA\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p><strong>Alternativa: b) 120 mA<\/strong><\/p>\n<hr \/>\n<div class=\"container\">\n<div id=\"content\" class=\"row\">\n<div id=\"article\" class=\"col-xs-12 col-md-8 col-lg-9\">\n<p><strong>Quest\u00e3o 7. <\/strong>Fuvest &#8211; 2010<\/p>\n<p>Medidas el\u00e9tricas indicam que a superf\u00edcie terrestre tem carga el\u00e9trica total negativa de, aproximadamente, 600.000 coulombs. Em tempestades, raios de cargas positivas, embora raros, podem atingir a superf\u00edcie terrestre. A corrente el\u00e9trica desses raios pode atingir valores de at\u00e9 300.000 A. Que fra\u00e7\u00e3o da carga el\u00e9trica total da Terra poderia ser compensada por um raio de 300.000 A e com dura\u00e7\u00e3o de 0,5 s?<\/p>\n<p>a) 1\/2<br \/>b) 1\/3<br \/>c) 1\/4<br \/>d) 1\/10<br \/>e) 1\/20<\/p>\n<hr \/><\/div>\n<\/div>\n<\/div>\n<p><strong>Resolu\u00e7\u00e3o:<\/strong><\/p>\n<p>O valor da corrente \u00e9 encontrado aplicando a seguinte f\u00f3rmula:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"i igual a numerador Q sobre denominador incremento t fim da fra\u00e7\u00e3o\" width=\"53\" height=\"35\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmo\u00bb\u00a7#8710;\u00ab\/mo\u00bb\u00abmi\u00bbt\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Sendo:<\/p>\n<p>i: corrente (A)<br \/>Q: carga el\u00e9trica (C)<br \/>\u0394t: intervalo de tempo (s)<\/p>\n<p>Substituindo os valores indicados, encontramos:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"300 espa\u00e7o 000 igual a numerador Q com r a i o subscrito fim do subscrito sobre denominador 0 v\u00edrgula 5 fim da fra\u00e7\u00e3o Q com r a i o subscrito fim do subscrito igual a 300 espa\u00e7o 000.0 v\u00edrgula 5 Q com r a i o subscrito fim do subscrito igual a 150 espa\u00e7o 000 espa\u00e7o C\" width=\"146\" height=\"97\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmn\u00bb300\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmsub\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmrow\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb300\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb.\u00ab\/mo\u00bb\u00abmn\u00bb0\u00ab\/mn\u00bb\u00abmo\u00bb,\u00ab\/mo\u00bb\u00abmn\u00bb5\u00ab\/mn\u00bb\u00abmspace linebreak=\u00a8newline\u00a8\/\u00bb\u00abmsub\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmn\u00bb150\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmi\u00bbC\u00ab\/mi\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p>Para conhecer a fra\u00e7\u00e3o da carga el\u00e9trica total da Terra que poderia ser compensada pelo raio, vamos fazer a seguinte raz\u00e3o:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"Wirisformula\" role=\"math\" src=\"data:image\/png;base64,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\" alt=\"Q com r a i o subscrito fim do subscrito sobre Q com T e r r a subscrito fim do subscrito igual a numerador 150 espa\u00e7o 000 sobre denominador 600 espa\u00e7o 000 fim da fra\u00e7\u00e3o igual a 1 quarto\" width=\"177\" height=\"45\" data-mathml=\"\u00abmath xmlns=\u00a8http:\/\/www.w3.org\/1998\/Math\/MathML\u00a8\u00bb\u00abmfrac\u00bb\u00abmsub\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00abmi\u00bbi\u00ab\/mi\u00bb\u00abmi\u00bbo\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00abmsub\u00bb\u00abmi\u00bbQ\u00ab\/mi\u00bb\u00abmrow\u00bb\u00abmi\u00bbT\u00ab\/mi\u00bb\u00abmi\u00bbe\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bbr\u00ab\/mi\u00bb\u00abmi\u00bba\u00ab\/mi\u00bb\u00ab\/mrow\u00bb\u00ab\/msub\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmrow\u00bb\u00abmn\u00bb150\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00abmrow\u00bb\u00abmn\u00bb600\u00ab\/mn\u00bb\u00abmo\u00bb\u00a7#160;\u00ab\/mo\u00bb\u00abmn\u00bb000\u00ab\/mn\u00bb\u00ab\/mrow\u00bb\u00ab\/mfrac\u00bb\u00abmo\u00bb=\u00ab\/mo\u00bb\u00abmfrac\u00bb\u00abmn\u00bb1\u00ab\/mn\u00bb\u00abmn\u00bb4\u00ab\/mn\u00bb\u00ab\/mfrac\u00bb\u00ab\/math\u00bb\" \/><\/p>\n<p><strong>Alternativa: c) 1\/4<\/strong><\/p>\n<p>[ratings]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quest\u00e3o 1. UERJ &#8211; 2019 Resistores \u00f4hmicos id\u00eanticos foram associados em quatro circuitos distintos e submetidos \u00e0 mesma tens\u00e3o UA,B.<\/p>\n","protected":false},"author":1,"featured_media":1839,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[196],"tags":[592,143,377,198],"class_list":["post-1828","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisica","tag-corrente-eletrica","tag-enem","tag-exercicios","tag-fisica"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2019\/06\/corrente-eletrica.jpg","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":2026,"url":"https:\/\/eliezerladeira.com.br\/blog\/tensao-eletrica\/","url_meta":{"origin":1828,"position":0},"title":"Tens\u00e3o El\u00e9trica","author":"admin","date":"","format":false,"excerpt":"Tens\u00e3o el\u00e9trica, tamb\u00e9m conhecida como diferen\u00e7a de potencial, \u00e9 a diferen\u00e7a de potencial el\u00e9trico entre dois pontos ou a diferen\u00e7a em energia potencial el\u00e9trica por unidade de carga el\u00e9trica entre dois pontos.","rel":"","context":"Em &quot;F\u00edsica&quot;","block_context":{"text":"F\u00edsica","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/disciplinas\/fisica\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2020\/04\/High_voltage_warning.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2020\/04\/High_voltage_warning.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2020\/04\/High_voltage_warning.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/eliezerladeira.com.br\/blog\/wp-content\/uploads\/2020\/04\/High_voltage_warning.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":2234,"url":"https:\/\/eliezerladeira.com.br\/blog\/acoplamento-desacoplamento-capacitivo\/","url_meta":{"origin":1828,"position":1},"title":"Capacitores &#8211; Princ\u00edpios para acoplamento e desacoplamento capacitivo de circuitos","author":"admin","date":"","format":false,"excerpt":"Idealmente, a imped\u00e2ncia do capacitor de acoplamento deve ser nula para a frequ\u00eancia do sinal. 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