{"id":21102,"date":"2021-04-29T11:55:59","date_gmt":"2021-04-29T14:55:59","guid":{"rendered":"https:\/\/beduka.com\/blog\/?p=21102"},"modified":"2021-04-29T11:56:01","modified_gmt":"2021-04-29T14:56:01","slug":"exercicios-sobre-a-primeira-lei-de-ohm","status":"publish","type":"post","link":"https:\/\/beduka.com\/blog\/exercicios\/exercicios-sobre-a-primeira-lei-de-ohm\/","title":{"rendered":"Exerc\u00edcios sobre a Primeira Lei de Ohm com Gabarito"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>A Lei de Ohm determina que para calcular a resist\u00eancia el\u00e9trica em um circuito, basta dividirmos o potencial el\u00e9trico pela corrente el\u00e9trica. Leia o resumo e depois fa\u00e7a exerc\u00edcios sobre a Primeira Lei de Ohm com gabarito para entender como funciona.\u00a0<\/strong><\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quer seguir diretamente para alguma parte espec\u00edfica?<\/strong> Clique em algum dos t\u00f3picos abaixo:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#leis-de-ohm\">O que s\u00e3o as Leis de Ohm?<\/a><\/li><li><a href=\"#primeira-Lei-de-ohm\">O que \u00e9 a Primeira Lei de Ohm?<\/a><\/li><li><a href=\"#Quest\u00f5es sobre a Primeira Lei de Ohm\">Exerc\u00edcios sobre a Primeira Lei de Ohm.<\/a><\/li><li><a href=\"#Gabarito dos Exerc\u00edcios sobre a Lei de Ohm\">Gabarito dos exerc\u00edcios sobre a Primeira Lei de Ohm.<\/a><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Quando voc\u00ea terminar os exerc\u00edcios sobre positivismo<strong>,<\/strong> coloque em pr\u00e1tica todo seu conhecimento com <a href=\"https:\/\/beduka.com\/simulado-enem\/#\/\" target=\"_blank\" rel=\"noreferrer noopener\">O Melhor Simulado Enem do Brasil.<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"leis-de-ohm\">O que s\u00e3o as Leis de Ohm?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>As leis de ohm s\u00e3o representadas por f\u00f3rmulas que nos permitem calcular grandezas como tens\u00e3o, corrente e resist\u00eancia el\u00e9tricas<\/strong>. Entre outros elementos que um circuito normalmente possui.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contudo, <strong>elas s\u00f3 podem ser aplicadas em corpos com resist\u00eancias constantes<\/strong> que tamb\u00e9m s\u00e3o chamadas de resist\u00eancias \u00f4hmicas.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>S\u00e3o mais de 200 resumos gratuitos para o ENEM<\/strong> no <a href=\"https:\/\/www.instagram.com\/beduka_oficial\/\" target=\"_blank\" rel=\"noreferrer noopener\">Instagram do Beduka<\/a>, aproveite!<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"primeira-Lei-de-ohm\">O que \u00e9 a Primeira Lei de Ohm?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A 1\u00aa Lei de Ohm determina que a diferen\u00e7a de potencial entre dois pontos de um resistor \u00e9 proporcional \u00e0 corrente el\u00e9trica do pr\u00f3prio resistor<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ela tamb\u00e9m afirma que <strong>a raz\u00e3o entre potencial e corrente el\u00e9tricos \u00e9 sempre constante<\/strong> em resistores \u00f4hmicos.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A f\u00f3rmula que representa essa lei \u00e9:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"65\" height=\"90\" src=\"https:\/\/beduka.com\/blog\/wp-content\/uploads\/2021\/04\/formula-da-1a-lei-de-ohm-1.jpg\" alt=\"\" class=\"wp-image-21105\"\/><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Nessa f\u00f3rmula:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>U<\/strong> = Tens\u00e3o ou potencial el\u00e9trico (V)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>r<\/strong> = resist\u00eancia el\u00e9trica&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>i <\/strong>= corrente el\u00e9trica&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A diferen\u00e7a de potencial entre dois pontos do circuito mostra que ali h\u00e1 uma resist\u00eancia el\u00e9trica<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essa diferen\u00e7a acontece porque os <strong>el\u00e9trons transferem parte da sua energia aos \u00e1tomos da rede cristalina<\/strong>, pois estes oferecem resist\u00eancia \u00e0 sua condu\u00e7\u00e3o.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esse fen\u00f4meno de transfer\u00eancia de energia \u00e9 chamado de <strong>efeito joule<\/strong>. Ou seja, ao passar por um resistor, os <strong>el\u00e9trons perdem energia<\/strong> e \u00e9 essa carga que \u00e9 usada para acender a luz da sua casa.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quanto \u00e0 corrente el\u00e9trica (i), <strong>ela mede exatamente esse fluxo de cargas<\/strong> em amp\u00e9res e \u00e9 <strong>diretamente proporcional \u00e0 resist\u00eancia<\/strong>.&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Atalho<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Tem um atalho que voc\u00ea pode pegar para lembrar a f\u00f3rmula da 1\u00aa Lei de Ohm. Voc\u00ea j\u00e1 deve ter ouvido falar do <strong>macete do tri\u00e2ngulo<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00c9 aquele em que <strong>desenhamos um tri\u00e2ngulo com todas as vari\u00e1veis e cobrimos aquela que queremos saber<\/strong>, desvendando assim a f\u00f3rmula para chegar at\u00e9 ela.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Veja a imagem abaixo e sempre que quiser descobrir alguma f\u00f3rmula, cubra a vari\u00e1vel que voc\u00ea deseja saber com o dedo. Assim, a f\u00f3rmula se revelar\u00e1.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"300\" src=\"https:\/\/beduka.com\/blog\/wp-content\/uploads\/2021\/04\/Formulas-da-1a-Lei-de-ohm.jpg\" alt=\"F\u00f3rmulas da 1\u00aa Lei de ohm\" class=\"wp-image-21106\" srcset=\"https:\/\/beduka.com\/blog\/wp-content\/uploads\/2021\/04\/Formulas-da-1a-Lei-de-ohm.jpg 600w, https:\/\/beduka.com\/blog\/wp-content\/uploads\/2021\/04\/Formulas-da-1a-Lei-de-ohm-300x150.jpg 300w, https:\/\/beduka.com\/blog\/wp-content\/uploads\/2021\/04\/Formulas-da-1a-Lei-de-ohm-320x160.jpg 320w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><figcaption>F\u00f3rmulas da 1\u00aa Lei de ohm<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Quest\u00f5es sobre a Primeira Lei de Ohm com Gabarito<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Esperamos que, com esse resumo, <strong>tudo tenha ficado mais claro para voc\u00ea.&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Obrigado<\/strong> por ter lido at\u00e9 aqui!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Baixe <strong>gratuitamente<\/strong> o <a href=\"https:\/\/beduka.com\/blog\/dicas\/enem-dicas\/plano-de-estudos-gratuito\/\" target=\"_blank\" rel=\"noreferrer noopener\">Plano de Estudos<\/a> do <strong>Beduka<\/strong> e tenha uma prepara\u00e7\u00e3o<strong> perfeita <\/strong>para o <strong>ENEM<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 1- (<\/strong><a href=\"https:\/\/www.vunesp.com.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>VUNESP<\/strong><\/a><strong>) <\/strong>Os valores nominais de uma l\u00e2mpada incandescente, usada em uma lanterna, s\u00e3o: 6,0 V; 20 mA. Isso significa que a resist\u00eancia el\u00e9trica do seu filamento \u00e9 de:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) <\/strong>150 \u03a9, sempre, com a l\u00e2mpada acesa ou apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) <\/strong>300 \u03a9, sempre, com a l\u00e2mpada acesa ou apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>300 \u03a9 com a l\u00e2mpada acesa e tem um valor bem maior quando apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d)<\/strong> 300 \u03a9 com a l\u00e2mpada acesa e tem um valor bem menor quando apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e) <\/strong>600 \u03a9 com a l\u00e2mpada acesa e tem um valor bem maior quando apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 2- (<\/strong><a href=\"https:\/\/portal.uel.br\/home\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UEL<\/strong><\/a><strong>) <\/strong>Um resistor de 10 \u03a9 no qual flui uma corrente el\u00e9trica de 3,0 amp\u00e8res est\u00e1 associado em paralelo com outro resistor. Sendo a corrente el\u00e9trica total, na associa\u00e7\u00e3o, igual a 4,5 amp\u00e8res, o valor do segundo resistor, em ohms, \u00e9:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) <\/strong>5,0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) <\/strong>10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>20<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d) <\/strong>30<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e) <\/strong>60<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Muito bem! <\/strong>Voc\u00ea chegou \u00e0 metade dos Exerc\u00edcios sobre a Primeira Lei de Ohm. Continue fazendo o restante.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 3- (<\/strong><a href=\"https:\/\/www.ucsal.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>UCSal-BA<\/strong><\/a><strong>) <\/strong>Um resistor de 100 \u03a9 \u00e9 percorrido por uma corrente el\u00e9trica de 20 mA. A ddp entre os terminais do resistor, em volts, \u00e9 igual a:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) <\/strong>2,0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) <\/strong>5,0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>2,0 . 10<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d) <\/strong>2,0 . 10<sup>3<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e) <\/strong>5,0 . 10<sup>3<\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quest\u00e3o 4- (<\/strong><a href=\"https:\/\/portal.uneb.br\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Uneb-BA<\/strong><\/a><strong>) <\/strong>Um resistor \u00f4hmico, quando submetido a uma ddp de 40 V, \u00e9 atravessado por uma corrente el\u00e9trica de intensidade 20 A. Quando a corrente que o atravessa for igual a 4 A, a ddp, em volts, nos seus terminais, ser\u00e1:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>a) <\/strong>8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>b) <\/strong>12<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>c) <\/strong>16<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>d) <\/strong>20<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>e) <\/strong>30<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Parab\u00e9ns,<\/strong> voc\u00ea fez todos os exerc\u00edcios sobre a Primeira Lei de Ohm. Confira agora o Gabarito:<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Gabarito dos Exerc\u00edcios sobre a Lei de Ohm<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido da quest\u00e3o 1 &#8211;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>d)<\/strong> 300 \u03a9 com a l\u00e2mpada acesa e tem um valor bem menor quando apagada.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido da quest\u00e3o 2 &#8211;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>c) <\/strong>20<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido da quest\u00e3o 3 &#8211;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>a) <\/strong>2,0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Exerc\u00edcio resolvido da quest\u00e3o 4 &#8211;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alternativa correta: <strong>a) <\/strong>8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Estude para o Enem com o <a href=\"https:\/\/beduka.com\/simulado\" target=\"_blank\" rel=\"noreferrer noopener\">Simulado Beduka.<\/a> <strong>\u00c9 gratuito!<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gostou das nossas quest\u00f5es sobre a Lei de Ohm? <\/strong>Compartilhe com os seus amigos e comente abaixo sobre as \u00e1reas que voc\u00ea deseja mais explica\u00e7\u00f5es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Queremos te ajudar a encontrar a FACULDADE IDEAL! <\/strong>Logo abaixo, fa\u00e7a uma pesquisa por curso e cidade que te mostraremos todas as faculdades que podem te atender.<strong> <\/strong>Informamos a nota de corte, valor de mensalidade, nota do MEC, avalia\u00e7\u00e3o dos alunos, modalidades de ensino e muito mais.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Leia este resumo para entender plenamente a lei e depois fa\u00e7a exerc\u00edcios sobre a primeira lei de ohm com Gabarito para testar o que aprendeu.<\/p>\n","protected":false},"author":1,"featured_media":21107,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[568,606],"tags":[],"class_list":["post-21102","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exercicios","category-fisica-exercicios"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Exerc\u00edcios sobre a Primeira Lei de Ohm com Gabarito<\/title>\n<meta name=\"description\" content=\"Leia este resumo para entender plenamente a lei e depois fa\u00e7a exerc\u00edcios sobre a primeira lei de ohm com Gabarito para testar o que aprendeu.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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