Question

用戴维南定理求下图所示各电路中的电流I,

Answer 1

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