{"id":80905,"date":"2024-01-14T13:21:46","date_gmt":"2024-01-14T13:21:46","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/circuitos-rl-caracteristicas-aplicacoes-e-exemplos\/"},"modified":"2024-01-20T10:11:08","modified_gmt":"2024-01-20T10:11:08","slug":"circuitos-rl-caracteristicas-aplicacoes-e-exemplos","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/pt-br\/circuitos-rl-caracteristicas-aplicacoes-e-exemplos\/","title":{"rendered":"Circuitos RL | Caracter\u00edsticas, aplica\u00e7\u00f5es e exemplos"},"content":{"rendered":"<h2>Circuitos RL: Compreendendo Seu Funcionamento e Aplica\u00e7\u00f5es<\/h2>\n<h2>O Que S\u00e3o Circuitos RL?<\/h2>\n<p>Os circuitos RL, formados por resistores (R) e indutores (L), s\u00e3o componentes cruciais nos sistemas el\u00e9tricos e eletr\u00f4nicos. Eles exibem comportamentos \u00fanicos durante processos transit\u00f3rios, como ao conectar ou desconectar uma fonte de tens\u00e3o. Os circuitos RL s\u00e3o usados em v\u00e1rias aplica\u00e7\u00f5es, incluindo filtros, osciladores e sistemas de amortecimento.<\/p>\n<h2>Processo de Energiza\u00e7\u00e3o<\/h2>\n<p>Ao conectar um circuito RL a uma fonte de tens\u00e3o cont\u00ednua (DC), a corrente come\u00e7a a fluir pelo resistor e indutor. \u00c0 medida que a corrente aumenta, o indutor gera uma for\u00e7a eletromotriz (EMF) de oposi\u00e7\u00e3o, que se op\u00f5e \u00e0 mudan\u00e7a da corrente. As equa\u00e7\u00f5es-chave para o processo de energiza\u00e7\u00e3o s\u00e3o:<\/p>\n<ul>\n<li>Corrente atrav\u00e9s do indutor: I(t) = (V<sub>source<\/sub> \/ R) \u00d7 (1 &#8211; e<sup>-t\/\u03c4<\/sup>)<\/li>\n<li>Tens\u00e3o no indutor: V<sub>L<\/sub>(t) = V<sub>source<\/sub> \u00d7 e<sup>-t\/\u03c4<\/sup><\/li>\n<li>Constante de tempo (\u03c4) do circuito RL: \u03c4 = L \/ R<\/li>\n<\/ul>\n<h2>Processo de Desenergiza\u00e7\u00e3o<\/h2>\n<p>Quando a fonte de tens\u00e3o \u00e9 desconectada, e o indutor \u00e9 descarregado atrav\u00e9s do resistor, a energia armazenada no campo magn\u00e9tico do indutor \u00e9 liberada, gerando uma EMF de oposi\u00e7\u00e3o que faz a corrente decair ao longo do tempo. As equa\u00e7\u00f5es-chave para o processo de desenergiza\u00e7\u00e3o s\u00e3o:<\/p>\n<ul>\n<li>Corrente atrav\u00e9s do indutor: I(t) = I<sub>inicial<\/sub> \u00d7 e<sup>-t\/\u03c4<\/sup><\/li>\n<li>Tens\u00e3o no indutor: V<sub>L<\/sub>(t) = -V<sub>inicial<\/sub> \u00d7 e<sup>-t\/\u03c4<\/sup><\/li>\n<li>Constante de tempo (\u03c4) do circuito RL: \u03c4 = L \/ R<\/li>\n<\/ul>\n<h2>Aplica\u00e7\u00f5es dos Circuitos RL<\/h2>\n<p>Os circuitos RL podem ser usados como filtros de passa-baixa ou passa-alta, atenuando frequ\u00eancias espec\u00edficas enquanto permitem a passagem de outras. Em uma configura\u00e7\u00e3o de filtro passa-baixa, a sa\u00edda \u00e9 tirada no indutor, enquanto em um filtro passa-alta, a sa\u00edda \u00e9 tirada no resistor.<\/p>\n<p>Os circuitos RL podem ser combinados com outros elementos de circuito, como capacitores, para criar osciladores que geram formas de onda peri\u00f3dicas cont\u00ednuas. Esses osciladores s\u00e3o \u00fateis na gera\u00e7\u00e3o de sinais, s\u00edntese de frequ\u00eancia e circuitos de rel\u00f3gio.<\/p>\n<p>Os circuitos RL tamb\u00e9m s\u00e3o empregados como elementos de amortecimento em sistemas onde \u00e9 necess\u00e1rio controlar oscila\u00e7\u00f5es ou vibra\u00e7\u00f5es, como em sistemas mec\u00e2nicos ou el\u00e9tricos.<\/p>\n<p>Al\u00e9m disso, os circuitos RL podem ser utilizados para gerar pulsos ou trens de pulso com tempos de subida e descida espec\u00edficos, que podem ser ajustados escolhendo valores apropriados de resistor e indutor.<\/p>\n<h2>Exemplo de C\u00e1lculo em um Circuito RL<\/h2>\n<p>Consideremos um exemplo de c\u00e1lculo de circuito RL, que envolve a resposta do circuito a uma fonte de tens\u00e3o:<\/p>\n<ul>\n<li>Valores dados: Fonte de tens\u00e3o (V<sub>source<\/sub>): 12 V, Resistor (R): 200 \u03a9, Indutor (L): 400 mH (0,4 H)<\/li>\n<li>Calcule a constante de tempo (\u03c4) do circuito RL: \u03c4 = L \/ R \u2192 \u03c4 = 0,4 H \/ 200 \u03a9 = 0,002 s (2 ms)<\/li>\n<li>Escolha um tempo espec\u00edfico (t) ap\u00f3s a aplica\u00e7\u00e3o da fonte de tens\u00e3o: t = 0,001 s (metade da constante de tempo)<\/li>\n<li>Calcule a corrente atrav\u00e9s do circuito (I) no tempo t: I(t) = (V<sub>source<\/sub> \/ R) \u00d7 (1 &#8211; e<sup>-t\/\u03c4<\/sup>) \u2192 I(0,001) \u2248 0,0236 A (23,6 mA)<\/li>\n<li>Calcule a tens\u00e3o no indutor (V<sub>L<\/sub>) no tempo t: V<sub>L<\/sub>(t) = V<sub>source<\/sub> \u00d7 e<sup>-t\/\u03c4<\/sup> \u2192 V<sub>L<\/sub>(0,001) \u2248 7,278 V<\/li>\n<\/ul>\n<p>Este exemplo demonstra como calcular a corrente atrav\u00e9s do circuito e a tens\u00e3o no indutor em um tempo espec\u00edfico ap\u00f3s a conex\u00e3o do circuito RL a uma fonte de tens\u00e3o. A mesma abordagem pode ser usada para a resposta do circuito quando a fonte de tens\u00e3o \u00e9 removida, com algumas modifica\u00e7\u00f5es nas equa\u00e7\u00f5es.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2022\/01\/logo.png\" alt=\"\" \/><\/p>\n<div style=\"text-align: center; font-size: 20px;\">\n    <a href=\"https:\/\/www.electricity-magnetism.org\/rl-circuits\/\">Original Article<\/a>\n<\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Os circuitos RL, compostos por resistores (R) e indutores (L), s\u00e3o componentes essenciais em sistemas el\u00e9tricos e eletr\u00f4nicos.<\/p>\n","protected":false},"author":1,"featured_media":1581,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[14],"tags":[],"class_list":["post-80905","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nao-categorizado","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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