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S 断开:
(1/R + 1/R + 1/R)* V1 = E/R + E/R + E/R
V1 = E
等效图:
I1 = (E - V1) / R = 0
I2 = (V1 - E) / R = 0
I3 = (E - V1) / R = 0
我是为了便于你理解而画出等效图,实际解题不需要画图,可以直接写出答案:
I1 = I2 = I3 = 0
S 闭合:
I1 = E/R
I2 = - E/R
I3 = E/R
http://wenku.baidu.com/view/1a26938d8762caaedd33d4bc.html
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