[問題] 電路學
經濟部97年新進職員
1.題目:http://ppt.cc/GIAx
一開始想用戴維寧等效電路 從A看入
因為V+ = V- = 0v ,所以Vth(Va) = 0-(6/40K)*10k + (6/40k)*30k = 3v
Rth = 10k//30k + 10k//30k = 15k
接下來想用節點分析法就卡住了 算不出Vo?
2.
i(t) = Va(t)/(6+j6)+Vb(t)/(6+j8) = 1.4cos(3t-45) +0.4cos(4t+127)
接下來是用p(t) = i(t)v(t) => pav = Vm1Im1cos(theta1) +Vm2Im2cos(theta2)
再解Irms 這樣硬算媽?
麻煩各位熱心的板友幫忙 非常感謝
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