{"id":1774,"date":"2016-01-11T22:14:29","date_gmt":"2016-01-11T22:14:29","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=1774"},"modified":"2024-08-19T16:35:10","modified_gmt":"2024-08-19T16:35:10","slug":"resistor-equivalente","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/eletricidade\/eletrodinamica\/resistor-equivalente\/","title":{"rendered":"Resistor equivalente"},"content":{"rendered":"

 <\/p>\n

\u00a0<\/span>Resistor equivalente<\/b><\/span><\/span><\/span><\/p>\n

Resi<\/b><\/span><\/span><\/span>stor equivalente (R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>)<\/b><\/span><\/span><\/span>\u00a0 \"\" Muitas vezes voc\u00ea deve <\/b><\/span><\/span><\/span>substituir um resistor de determinado<\/b><\/span><\/span><\/span> <\/b>valor nominal, num circuito el\u00e9trico, mas n\u00e3o o possui.<\/b><\/span><\/span><\/span><\/b><\/p>\n

No entanto voc\u00ea pode <\/b><\/span><\/span><\/span>substitu\u00ed-lo por uma associa\u00e7\u00e3o de resistores que possua o mesmo valor<\/b><\/span><\/span><\/span> <\/b>nominal.<\/b><\/span><\/span><\/span> Essa <\/b><\/span><\/span><\/span>associa\u00e7\u00e3o <\/b><\/span><\/span><\/span>recebe o nome de\u00a0<\/b><\/span><\/span><\/span>resistor equivalente (R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>) <\/b><\/span><\/span><\/span>da associa\u00e7\u00e3o,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>que \u00e9 <\/b><\/span><\/span><\/span>aquele que, submetido \u00e0 mesma diferen\u00e7a de potencial da associa\u00e7\u00e3o, \u00e9 percorrido pela mesma corrente, n\u00e3o alterando as caracter\u00edsticas do circuito.<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Resistor equivalente na associa\u00e7\u00e3o s\u00e9rie<\/b><\/span><\/span><\/span><\/p>\n

Uma \u00a0<\/b><\/span><\/span><\/span>associa\u00e7\u00e3o s\u00e9rie<\/b><\/span><\/span><\/span>\u00a0\u00e9 aquela em que os <\/b><\/span><\/span><\/span>resistores est\u00e3o associados um em seguida do outro de modo que a corrente em cada um seja a mesma.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

C\u00e1lculo da resist\u00eancia (R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>) do resistor equivalente<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>na associa\u00e7\u00e3o s\u00e9rie<\/b><\/span><\/span><\/span> \"\" a \u00a0<\/b><\/span><\/span><\/span>resist\u00eancia<\/b><\/span><\/span><\/span> do <\/b><\/span><\/span><\/span>resistor equivalente entre A e B<\/b><\/span><\/span><\/span> \u00e9 fornecida pela <\/b><\/span><\/span><\/span>soma das resist\u00eancias de cada resistor.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Exemplos num\u00e9ricos:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Resistor equivalente na associa\u00e7\u00e3o paralelo<\/b><\/span><\/span><\/span><\/p>\n

A <\/b><\/span><\/span><\/span>associa\u00e7\u00e3o paralelo<\/b><\/span><\/span><\/span>\u00a0\u00e9 aquela em que\u00a0<\/b><\/span><\/span><\/span> os <\/b><\/span><\/span><\/span>resistores s\u00e3o associados pelos seus terminais<\/b><\/span><\/span><\/span>, ou seja, <\/b><\/span><\/span><\/span>todos saem do mesmo ponto (A) e todos chegam ao mesmo ponto (B).<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

C\u00e1lculo da resist\u00eancia (R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>) do resistor equivalente na associa\u00e7\u00e3o paralelo:<\/b><\/span><\/span><\/span><\/p>\n

Tr\u00eas processos:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

3<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0\u2013<\/b><\/span><\/span><\/span>\u00a0Regra pr\u00e1tica:<\/b><\/span><\/span><\/span><\/p>\n

\"\"\u00a0quando <\/b><\/span><\/span><\/span>um<\/b><\/span><\/span><\/span> \u00e9 o <\/b><\/span><\/span><\/span>dobro <\/b><\/span><\/span><\/span>do outro, voc\u00ea <\/b><\/span><\/span><\/span>pega o maior e divide por tr\u00eas;<\/b><\/span><\/span><\/span><\/p>\n

\u00a0 quando <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>\u00e9 o <\/b><\/span><\/span><\/span>triplo<\/b><\/span><\/span><\/span> do outro, voc\u00ea <\/b><\/span><\/span><\/span>pega o maior e divide por quatro, <\/b><\/span><\/span><\/span>e assim por diante.<\/b><\/span><\/span><\/span><\/p>\n

\"\"\u00a0<\/span>dois resistores iguais<\/b><\/span><\/span><\/span>, voc\u00ea <\/b><\/span><\/span><\/span>divide o valor de um deles por dois;<\/b><\/span><\/span><\/span><\/p>\n

\u00a0\u00a0 <\/span>tr\u00eas resistores iguais<\/b><\/span><\/span><\/span>, voc\u00ea <\/b><\/span><\/span><\/span>divide o valor de um deles por tr\u00eas, <\/b><\/span><\/span><\/span>e assim por diante.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

Em alguns casos essa regra pr\u00e1tica, quando o <\/b><\/span><\/span><\/span>n\u00famero n\u00e3o der exato<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>pode ser substitu\u00edda<\/b><\/span><\/span><\/span> por <\/b><\/span><\/span><\/span>uma das duas acima.<\/b><\/span><\/span><\/span><\/p>\n

Exemplo num\u00e9rico:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

1<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0processo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Se voc\u00ea invertesse a ordem, o resultado seria o mesmo:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Resistor equivalente na associa\u00e7\u00e3o mista<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Associa\u00e7\u00e3o Mista<\/b><\/span><\/span><\/span>\u00a0 \"\" consta de uma <\/b><\/span><\/span><\/span>combina\u00e7\u00e3o das associa\u00e7\u00f5es s\u00e9rie e paralelo,<\/b><\/span><\/span><\/span> cujo c\u00e1lculo voc\u00ea deve fazer <\/b><\/span><\/span><\/span>por partes at\u00e9 chegar a um \u00fanico resistor equivalente R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/b><\/p>\n

Para isso deve-se ir <\/b><\/span><\/span><\/span>substituindo cada associa\u00e7\u00e3o parcial, s\u00e9rie ou paralelo<\/b><\/span><\/span><\/span>, por um <\/b><\/span><\/span><\/span>\u00fanico resistor<\/b><\/span><\/span><\/span> e <\/b><\/span><\/span><\/span>ir diminuindo<\/b><\/span><\/span><\/span> aos poucos o <\/b><\/span><\/span><\/span>esquema da associa\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

Analise detalhadamente esses exemplos:<\/b><\/span><\/span><\/span><\/b><\/p>\n

Em <\/b><\/span><\/span><\/span>cada caso<\/b><\/span><\/span><\/span> abaixo, calcule a <\/b><\/span><\/span><\/span>resist\u00eancia equivalente entre os pontos P e Q.<\/b><\/span><\/span><\/span><\/p>\n

01-<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

02-<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n

03- <\/b><\/span><\/span><\/span>Veja bem, os tr\u00eas \u00faltimos est\u00e3o em s\u00e9rie, <\/b><\/span><\/span><\/span>comece por eles:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0Quer se <\/b><\/span><\/span><\/span>aprofundar mais?<\/b><\/span><\/span><\/span> Veja, com as respectivas resolu\u00e7\u00f5es os exerc\u00edcios <\/b><\/span><\/span><\/span>01 (d, e, i, j e l); 06; 13 e 33.<\/b><\/span><\/span><\/span><\/p>\n

O que voc\u00ea deve saber, informa\u00e7\u00f5es e dicas<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/span><\/p>\n

C\u00e1lculo da resist\u00eancia (R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>) do resistor equivalente na associa\u00e7\u00e3o paralelo:<\/b><\/span><\/span><\/span><\/p>\n

Tr\u00eas processos:<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

3<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0\u2013<\/b><\/span><\/span><\/span>\u00a0Regra pr\u00e1tica:<\/b><\/span><\/span><\/span><\/p>\n

\"\"\u00a0quando <\/b><\/span><\/span><\/span>um<\/b><\/span><\/span><\/span> \u00e9 o <\/b><\/span><\/span><\/span>dobro <\/b><\/span><\/span><\/span>do outro, voc\u00ea <\/b><\/span><\/span><\/span>pega o maior e divide por tr\u00eas;<\/b><\/span><\/span><\/span><\/p>\n

\u00a0 quando <\/b><\/span><\/span><\/span>um <\/b><\/span><\/span><\/span>\u00e9 o <\/b><\/span><\/span><\/span>triplo<\/b><\/span><\/span><\/span> do outro, voc\u00ea <\/b><\/span><\/span><\/span>pega o maior e divide por quatro, <\/b><\/span><\/span><\/span>e assim por diante.<\/b><\/span><\/span><\/span><\/p>\n

\"\"\u00a0<\/span>dois resistores iguais<\/b><\/span><\/span><\/span>, voc\u00ea <\/b><\/span><\/span><\/span>divide o valor de um deles por dois;<\/b><\/span><\/span><\/span><\/p>\n

\u00a0\u00a0 <\/span>tr\u00eas resistores iguais<\/b><\/span><\/span><\/span>, voc\u00ea <\/b><\/span><\/span><\/span>divide o valor de um deles por tr\u00eas, <\/b><\/span><\/span><\/span>e assim por diante.\u00a0<\/b><\/span><\/span><\/span><\/p>\n

Em alguns casos essa regra pr\u00e1tica, quando o <\/b><\/span><\/span><\/span>n\u00famero n\u00e3o der exato<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>pode ser substitu\u00edda<\/b><\/span><\/span><\/span> por <\/b><\/span><\/span><\/span>uma das duas acima.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span>Quanto<\/b><\/span><\/span><\/span>\u00a0menor<\/b><\/span><\/span><\/span>\u00a0for a resist\u00eancia equivalente<\/b><\/span><\/span><\/span> de uma associa\u00e7\u00e3o de resistores,\u00a0<\/b><\/span><\/span><\/span>maior<\/b><\/span><\/span><\/span>\u00a0ser\u00e1 a pot\u00eancia<\/b><\/span><\/span><\/span> <\/b>dissipada por ela de modo que sua efici\u00eancia seja maior<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0justificativa\u00a0 \"\" P<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sub><\/span>=U<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\/R<\/b><\/span><\/span><\/span>eq<\/b><\/span><\/span><\/sub><\/span>\u00a0 \"\"\u00a0 observe que a <\/b><\/span><\/span><\/span>pot\u00eancia \u00e9 inversamente proporcional \u00e0 resist\u00eancia equivalente.<\/b><\/span><\/span><\/span><\/p>\n

\"\" Disjuntores<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Disjuntores<\/b><\/span><\/span><\/span>\u00a0 \"\" <\/b><\/span><\/span><\/span>A fun\u00e7\u00e3o\u00a0do <\/b><\/span><\/span><\/span>disjuntor \u00e9\u00a0interromper automaticamente a passagem da corrente<\/b><\/span><\/span><\/span> <\/b>el\u00e9trica por um dos pontos (c\u00f4modos) da resid\u00eancia<\/b><\/span><\/span><\/span>, quando sua<\/b><\/span><\/span><\/span>intensidade excede determinado<\/b><\/span><\/span><\/span> <\/b>valor <\/b><\/span><\/span><\/span>(a chave desliga).<\/b><\/span><\/span><\/span><\/p>\n

Se a <\/b><\/span><\/span><\/span>chave do disjuntor, com o excesso de corrente el\u00e9trica n\u00e3o desligasse<\/b><\/span><\/span><\/span>, os <\/b><\/span><\/span><\/span>fios do circuito seriam muito aquecidos podendo fundir, causando inc\u00eandios.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Junto aos disjuntores,<\/b><\/span><\/span><\/span> na caixa de luz, existe um <\/b><\/span><\/span><\/span>quadro identificador dos c\u00f4modos ou pontos atendidos por cada disjuntor, como por exemplo, ilumina\u00e7\u00e3o, tomadas, chuveiros, etc..<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Reostatos<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Reostatos<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>s\u00e3o resistores vari\u00e1veis<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>cuja finalidade \u00e9<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>adaptar a intensidade da corrente el\u00e9trica a valores desejados.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Tipos de reostatos:<\/b><\/span><\/span><\/span><\/span><\/p>\n

Os<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>principais tipos de reostatos s\u00e3o<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>\u00a0\"\"<\/b><\/span><\/span>\u00a0\u00a0<\/b><\/span><\/span>reostato de cursor<\/b><\/span><\/span>\u00a0\"\"<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>variando o cursor<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>voc\u00ea est\u00e1<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"variando a resist\u00eancia<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>(figura 1) \u00a0\"\"\u00a0<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>reostato<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>pontos<\/b><\/span><\/span>\u00a0\"\"<\/b><\/span><\/span>em<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>cada posi\u00e7\u00e3o da chave<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>a<\/b><\/span><\/span>resist\u00eancia el\u00e9trica<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>tem um<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>determinado valor<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>(figura 2).<\/b><\/span><\/span><\/span><\/span><\/p>\n

Curto circuito (CC)<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

\u00a0Quando <\/b><\/span><\/span><\/span>se liga (une) dois pontos de um circuito el\u00e9trico por um condutor (fio) de resist\u00eancia<\/b><\/span><\/span><\/span> <\/b>desprez\u00edvel (fio ideal, fio sem resist\u00eancia),<\/b><\/span><\/span><\/span> diz-se que esses <\/b><\/span><\/span><\/span>dois pontos ficam em curto circuito (CC).<\/b><\/span><\/span><\/span><\/p>\n

Considere um <\/b><\/span><\/span><\/span>resistor R<\/b><\/span><\/span><\/span> sendo percorrido por uma <\/b><\/span><\/span><\/span>corrente el\u00e9trica<\/b><\/span><\/span><\/span> i e submetido a uma <\/b><\/span><\/span><\/span>diferen\u00e7a de potencial U<\/b><\/span><\/span><\/span>AB <\/b><\/span><\/span><\/sub><\/span>= V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0– V<\/b><\/span><\/span><\/span>B.<\/b><\/span><\/span><\/sub><\/span><\/p>\n

\"\"<\/p>\n

Ligando-se, <\/b><\/span><\/span><\/span>em paralelo, entre os pontos A e B desse resistor<\/b><\/span><\/span><\/span>, um <\/b><\/span><\/span><\/span>condutor de resist\u00eancia desprez\u00edvel (fio ideal),<\/b><\/span><\/span><\/span> provoca-se um <\/b><\/span><\/span><\/span>curto circuito entre A e B<\/b><\/span><\/span><\/span> e verifica-se que <\/b><\/span><\/span><\/span>toda a corrente el\u00e9trica se desviar\u00e1, passando pelo fio ideal<\/b><\/span><\/span><\/span>, no qual, <\/b><\/span><\/span><\/span>aplicando-se a lei de Ohm ter-se-\u00e1<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0 V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0\u2013 V<\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/sub><\/span>= U<\/b><\/span><\/span><\/span>AB <\/b><\/span><\/span><\/sub><\/span>= R.i\u00a0 \"\"\u00a0 como<\/b><\/span><\/span><\/span>R = 0 (fio ideal),<\/b><\/span><\/span><\/span> tem-se\u00a0 \"\"\u00a0 <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0\u2013 V<\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/sub><\/span>= R.i<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0 V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0\u2013 V<\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/sub><\/span>= 0.i\u00a0 \"\"\u00a0 V<\/b><\/span><\/span><\/span>A<\/b><\/span><\/span><\/sub><\/span>\u00a0\u2013 V<\/b><\/span><\/span><\/span>B <\/b><\/span><\/span><\/sub><\/span>= 0\u00a0 \"\"\u00a0 <\/b><\/span><\/span><\/span>V<\/b><\/span><\/span><\/span>A <\/b><\/span><\/span><\/sub><\/span>= V<\/b><\/span><\/span><\/span>B.<\/b><\/span><\/span><\/sub><\/span><\/p>\n

Assim, o <\/b><\/span><\/span><\/span>circuito se comporta como se o resistor n\u00e3o existisse<\/b><\/span><\/span><\/span> e pode-se <\/b><\/span><\/span><\/span>redesenhar o circuito, tornando os pontos A e B coincidentes.<\/b><\/span><\/span><\/span><\/p>\n

Exemplos de c\u00e1lculo do valor da resist\u00eancia (R<\/b><\/span><\/span><\/span>eq)<\/b><\/span><\/span><\/sub><\/span> do resistor equivalente, <\/b><\/span><\/span><\/span>com curto-circuito (CC)<\/b><\/span><\/span><\/span><\/p>\n

Calcule,<\/b><\/span><\/span><\/span> em cada caso, a <\/b><\/span><\/span><\/span>resist\u00eancia do resistor equivalente entre os pontos A e B:<\/b><\/span><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

b)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

c)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

\u00a0<\/span><\/p>\n

C\u00e1lculo do resistor equivalente em casos mais complexos de curto-circuito<\/b><\/span><\/span><\/span><\/p>\n

\u00a0Em <\/b><\/span><\/span><\/span>alguns casos de curto circuito mais complexos<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>n\u00e3o \u00e9 poss\u00edvel visualizar a situa\u00e7\u00e3o (os pontos em curto-circuito)<\/b><\/span><\/span><\/span> e \u00e9 preciso <\/b><\/span><\/span><\/span>refazer o circuito<\/b><\/span><\/span><\/span>, procedendo da seguinte <\/b><\/span><\/span><\/span>maneira pr\u00e1tica:<\/b><\/span><\/span><\/span><\/p>\n

1<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0\"\" <\/b><\/span><\/span><\/span>Marcar<\/b><\/span><\/span><\/span> todos os <\/b><\/span><\/span><\/span>n\u00f3s <\/b><\/span><\/span><\/span>da associa\u00e7\u00e3o <\/b><\/span><\/span><\/span>(n\u00f3 \u2013 ponto de cruzamento de 3 ou mais fios ).<\/b><\/span><\/span><\/span><\/p>\n

2<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0\"\" Colocar <\/b><\/span><\/span><\/span>letras <\/b><\/span><\/span><\/span>em <\/b><\/span><\/span><\/span>cada n\u00f3,<\/b><\/span><\/span><\/span> lembrando que os <\/b><\/span><\/span><\/span>pontos unidos por fio ideal (n\u00f3s)<\/b><\/span><\/span><\/span> est\u00e3o em <\/b><\/span><\/span><\/span>curto circuito e devem ser nomeados a mesma letra<\/b><\/span><\/span><\/span>, pois possuem o <\/b><\/span><\/span><\/span>mesmo potencial.<\/b><\/span><\/span><\/span><\/p>\n

3<\/b><\/span><\/span><\/span>o<\/b><\/span><\/span><\/sup><\/span>\u00a0\"\" <\/b><\/span><\/span><\/span>Refazer o circuito<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

Exemplos de c\u00e1lculo do valor da resist\u00eancia (R<\/b><\/span><\/span><\/span>eq)<\/b><\/span><\/span><\/sub><\/span> do resistor equivalente, <\/b><\/span><\/span><\/span>com curto-circuito (CC), refazendo o circuito<\/b><\/span><\/span><\/span><\/p>\n

Determine, em <\/b><\/span><\/span><\/span>cada caso<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>entre <\/b><\/span><\/span><\/span>os <\/b><\/span><\/span><\/span>pontos P e Q,<\/b><\/span><\/span><\/span> a <\/b><\/span><\/span><\/span>resist\u00eancia equivalente<\/b><\/span><\/span><\/span> de cada associa\u00e7\u00e3o:<\/b><\/span><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Etapas: <\/b><\/span><\/span><\/span>Preste muita aten\u00e7\u00e3o nas etapas da resolu\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"\u00a0<\/span>Refazendo o circuito<\/b><\/span><\/span><\/span><\/p>\n

Os resistores entre os pontos P e P<\/b><\/span><\/span><\/span>, unidos pela <\/b><\/span><\/span><\/span>mesma letra, est\u00e3o em curto circuito<\/b><\/span><\/span><\/span> \"\" <\/b><\/span><\/span><\/span>n\u00e3o colocar<\/b><\/span><\/span><\/span> os resistores de <\/b><\/span><\/span><\/span>5\u2126 e 30 \u2126<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0 entre <\/b><\/span><\/span><\/span>P e B <\/b><\/span><\/span><\/span>tem um<\/b><\/span><\/span><\/span> de 30 \u2126 <\/b><\/span><\/span><\/span>e um<\/b><\/span><\/span><\/span> de 8 \u2126<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0 <\/b><\/span><\/span><\/span>entre B e Q<\/b><\/span><\/span><\/span> tem<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

um <\/b><\/span><\/span><\/span>de 10\u2126<\/b><\/span><\/span><\/span>\u00a0 \"\"\u00a0 veja esquema e seq\u00fc\u00eancia acima.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

c)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Observa\u00e7\u00e3o:<\/b><\/span><\/span><\/span> Se voc\u00ea quiser <\/b><\/span><\/span><\/span>aprofundar mais<\/b><\/span><\/span><\/span>, analise os exerc\u00edcios 26; 28(c); 29; 30; 34(c) e 35, com as respectivas resolu\u00e7\u00f5es.<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

Confira os exerc\u00edcios com resolu\u00e7\u00e3o comentada<\/a><\/span><\/h3>\n","protected":false},"excerpt":{"rendered":"

  \u00a0Resistor equivalente Resistor equivalente (Req)\u00a0 Muitas vezes voc\u00ea deve substituir um resistor de determinado valor nominal, num circuito el\u00e9trico, mas n\u00e3o o possui. No entanto voc\u00ea pode substitu\u00ed-lo por uma associa\u00e7\u00e3o de resistores que possua o mesmo valor nominal. Essa associa\u00e7\u00e3o recebe o nome de\u00a0resistor equivalente (Req) da associa\u00e7\u00e3o,\u00a0que \u00e9 aquele que, submetido \u00e0 mesma diferen\u00e7a de potencial da<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1676,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-1774","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1774","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=1774"}],"version-history":[{"count":2,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1774\/revisions"}],"predecessor-version":[{"id":1780,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1774\/revisions\/1780"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/1676"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=1774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}