用叠加定理求电路的U和I.
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用叠加定理求电路的U和I.
(1)电压源单独作用,电流源开路,负载是不平衡电桥,两臂电阻按各自的比例对电压源分压:
U‘ = 28 * 4 / 7 - 14 = 2 V
I’ = - 28 / (4 * 7 / (4 + 7)) = - 11 A
(2)电流源单独作用,电压源短路,电路分析见下图,各支路电流是按电阻值反比例分流:
I‘’ = 8 * 4 / 7 - 4 = 0.5714 A
U‘’ = 8 * (3 // 4 + 1) = 8 * 2.7143 =21.714 V
(3)合并:
U = U' + U'' = 23.714 V
I = I' + I'' = - 10.43 A
U‘ = 28 * 4 / 7 - 14 = 2 V
I’ = - 28 / (4 * 7 / (4 + 7)) = - 11 A
(2)电流源单独作用,电压源短路,电路分析见下图,各支路电流是按电阻值反比例分流:
I‘’ = 8 * 4 / 7 - 4 = 0.5714 A
U‘’ = 8 * (3 // 4 + 1) = 8 * 2.7143 =21.714 V
(3)合并:
U = U' + U'' = 23.714 V
I = I' + I'' = - 10.43 A