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Exercício 2 I. Uma pilha comercial fornece uma corrente de 5 mA durante 20 horas. Durante esse tempo, a tensão nos terminais da pilha varia linearm...

Exercício 2
I. Uma pilha comercial fornece uma corrente de 5 mA durante 20 horas. Durante esse tempo, a tensão nos terminais da pilha varia linearmente entre 1,5 V e 1,0 V. Quanto vale a energia total fornecida pela pilha durante essas 20 horas?
(a) 450 J.
(b) 1,25 Wh.
(c) 21,5 × 10−5 kWh.
(d) 220 J.
II. Um chuveiro é alimentado pela tensão v(t) = 220√2 cos(377t) (V, s). A corrente que percorre a resistência do chuveiro vale i(t) = 30√2 cos(377t) (A, s). Qual é a potência média consumida pelo chuveiro?

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Primeira Aula de Exercícios
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Sistemas Eletronicos • Universidade PaulistaUniversidade Paulista

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Crislaine da Silva

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Crislaine da Silva

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Vamos analisar as alternativas: A) 450 J: Não, essa não é a energia total fornecida pela pilha durante essas 20 horas. B) 1,25 Wh: Também não, essa não é a unidade correta para a energia total fornecida pela pilha. C) 21,5 × 10−5 kWh: Essa é a resposta correta, pois 1 kWh = 3,6 x 10^6 J, então 20 horas correspondem a 20/3600 = 1/180 de um kWh, que é 5,56 x 10^-3 kWh, ou 5,56 x 10^-3 x 3,6 x 10^6 J = 20 x 10^3 J = 20,0 x 10^3 J = 20,0 kJ = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0 x 10^3 J = 20,0

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