http://wenku.baidu.com/view/1a26938d8762caaedd33d4bc.html
先把戴维南定理的规则仔细看一遍。
Uab = 4 + 2 * 2
= 8 V
Rab = 2 + 3
= 5 Ω
I = Uab / （Rab + RL）
= 8 / (5 + 1)
= 4/3 A
Uab = - 1 * 2 + 2 * I1 + 2 * 5
= - 2 + 2 * (5 - 2) + 10
= 14 V
Rab = 1 + 2 + 2
= 5 Ω
I = Uab / (Rab + RL)
= 14 / (5 + 2)
= 2 A
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