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Segunda Lista de exerccios_ circuitos 1_Eng Eltrica_2010

Segunda Lista de exerccios_ circuitos 1_Eng Eltrica_2010 -...

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Engenharia Elétrica – Circuitos Elétricos 1 Segunda Lista de Exercícios 1. No circuito mostrado abaixo, o resistor variável R é ajustado de tal forma que a potência no resistor de 5 seja 20 W. Encontre o valor de R, a potência fornecida pela fonte e o valor da corrente em R. (R: R = 16 ; P fornecida = 125 W; I R = 2,5 A) 2. Calcule R 1 e R 2 para o circuito abaixo: (R: R 1 = 20 ; R 2 = 5 ) 3. O resistor de 12 do circuito abaixo dissipa 147 W. Encontre o valor da fonte de tensão V s . (R: V s = 100 V) 4. Usar divisão de tensão duas vezes para achar a tensão V x no circuito abaixo: (R: V x = 36 V)
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5. Duas fontes de tensão constante atuam no circuito da figura abaixo. Determinar a potência P que cada fonte fornece ao circuito. (R: W 15 P e W 75 P V 5 V 25 = = ) 6. Um circuito é constituído por doze fios de resistência R, ligados segundo as arestas de um cubo, como indica a figura a seguir. A excitação é feita por dois vértices de uma diagonal principal. A resistência vista pela fonte vale (R: R 6 5 R = ) 7. Determinar a tensão V AB .
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