{"id":17498,"date":"2024-09-23T15:02:58","date_gmt":"2024-09-23T18:02:58","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=17498"},"modified":"2024-09-23T15:03:00","modified_gmt":"2024-09-23T18:03:00","slug":"questao-83-enem-2013","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-83-enem-2013\/","title":{"rendered":"Quest\u00e3o 083 &#8211; ENEM 2013\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Medir temperatura \u00e9 fundamental em muitas aplica\u00e7\u00f5es, e apresentar a leitura em mostradores digitais \u00e9 bastante pr\u00e1tico. O seu funcionamento \u00e9 baseado na correspond\u00eancia entre valores de temperatura e de diferen\u00e7a de potencial el\u00e9trico. Por exemplo, podemos usar o circuito el\u00e9trico apresentado, no qual o elemento sensor de temperatura ocupa um dos bra\u00e7os do circuito (Rs ) e a depend\u00eancia da resist\u00eancia com a temperatura \u00e9 conhecida.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"338\" height=\"223\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-846.png\" alt=\"\" class=\"wp-image-17499\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-846.png 338w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-846-300x198.png 300w\" sizes=\"(max-width: 338px) 100vw, 338px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Para um valor de temperatura em que RS = 100 \u03a9, a leitura apresentada pelo volt\u00edmetro ser\u00e1 de&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A0 + 6,2 V.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B) + 1,7 V.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C) + 0,3 V.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D) \u2013 0,3 V.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E) \u2013 6,2 V<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Podemos calcular a corrente em cada ramo sabendo que a diferen\u00e7a de potencial entre os pontos de cima e o ponto de baixo ser\u00e1 de 10 V. Utilizando a primeira Lei de Ohm, temos:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"91\" height=\"95\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-847.png\" alt=\"\" class=\"wp-image-17500 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 91px; --smush-placeholder-aspect-ratio: 91\/95;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Para calcular a resist\u00eancia equivalente, temos que em s\u00e9rie<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Req=R1+R2+&#8230;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E em paralelo&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"143\" height=\"36\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-848.png\" alt=\"\" class=\"wp-image-17501 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 143px; --smush-placeholder-aspect-ratio: 143\/36;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Assim, a corrente que passa pelo lado esquerdo i<sub>1<\/sub> \u00e9 dada por:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"142\" height=\"206\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-849.png\" alt=\"\" class=\"wp-image-17502 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 142px; --smush-placeholder-aspect-ratio: 142\/206;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Da mesma forma, a corrente que passa pelo lado direito i<sub>2<\/sub> \u00e9 dada por:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"168\" height=\"120\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-850.png\" alt=\"\" class=\"wp-image-17503 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 168px; --smush-placeholder-aspect-ratio: 168\/120;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Em seguida, precisamos comparar a ddp no meio do circuito, onde est\u00e1 o volt\u00edmetro considerando que o ponto do lado direito est\u00e1 aterrado.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"189\" height=\"387\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-851.png\" alt=\"\" class=\"wp-image-17504 lazyload\" title=\"\" data-srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-851.png 189w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-851-147x300.png 147w\" data-sizes=\"(max-width: 189px) 100vw, 189px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 189px; --smush-placeholder-aspect-ratio: 189\/387;\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Fazemos agora a diferen\u00e7a de pot\u00eancia entre os dois pontos<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"211\" height=\"194\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-852.png\" alt=\"\" class=\"wp-image-17505 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 211px; --smush-placeholder-aspect-ratio: 211\/194;\"><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Alternativa D<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Medir temperatura \u00e9 fundamental em muitas aplica\u00e7\u00f5es, e apresentar a leitura em mostradores digitais \u00e9 bastante pr\u00e1tico. O seu funcionamento \u00e9 baseado na correspond\u00eancia entre valores de temperatura e de diferen\u00e7a de potencial el\u00e9trico. Por exemplo, podemos usar o circuito el\u00e9trico apresentado, no qual o elemento sensor de temperatura ocupa um dos bra\u00e7os do circuito [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":17499,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,26],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-17498","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-26","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-fisica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/17498","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=17498"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/17498\/revisions"}],"predecessor-version":[{"id":17506,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/17498\/revisions\/17506"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/17499"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=17498"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=17498"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=17498"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=17498"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=17498"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}