Question

如何用电源等效变换求电流i,

Answer 1

从左往右依次变化电源性质,同时合并同类电源：

Is1 = 12/3 = 4 A ,R1 = 3Ω ；等效成电流源.

Is2 = 4 + 2 = 6 A ,R2 = 3 // 6 = 2Ω ；合并电流源.

Us3 = 6 * 2 = 12 V, R3 = 2 + 2 = 4 Ω ；等效成电压源,合并电阻.

Is4 = 12/4 = 3 A,R4 = 4 Ω ；等效成电流源.

Is5 = 4/2 = 2 A ,R5 = 2Ω

Is6 = 3 + 2 = 5 A ,R6 = 4 // 2 = 1.333 A ；合并电流源.

I = 5 * 1.333 / (1 + 1.333) = 2.857 A ；并联电阻反比例分流.