2012南京航空航天大学考研试题 819电路(含参考答案).pdf

A A . 216W B . 180W C . 144W D . 72W RL A . 0.75W B . 2W C . 3W D . 8W + 1Ω Ω 6A 1 6V 1Ω −12V + 1A + RL 1Ω 1Ω 2Ω 2V 1.1 1.2 1 R 30Ω 40Ωu ωC 100V A . 141.4V B . 100V C . 70.7V D . 20V iS 8 2 cos100t A A . 64W B . 16W C . 8W D . 2W + 0.01F R C iS 0.01H u V 0.04F − C R 0.25Ω 1.3 1.4 819 1 4 u (t ) 1 u (t ) 2 A. B. C. D. u 3e−5t ε(t) V u S o A . 2(e−2t −e−5t )ε(t ) V B . (e−2t −e−5t )ε(t) V C . 2(e−5t −e−2t )ε(t ) V D