灵鹊做题网求大神帮做电路基础题!
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求大神帮做电路基础题!
如图
如图
可以直接用节点电压法,或者网孔电流法列方程求解,只是节点、网孔较多,解方程组麻烦.如图,我先用戴维南定理分两部分化简：
(1) 用网孔电流法,左边网孔电流就是 1A .
9 * I1 - 3 * 1 = 2
I1 = 5/9 A
4 * I2 + 2 * 1 = 2
I2 = 0 A
Uab = 6 * 5/9 = 10/3 A
Rab = 3//6 + 2//2 = 3 Ω
(2) 并联分流.
I1 = 7 * 9/14 = 4.5 A
I2 = 7 * 5/14 = 2.5 A
Uab = 3 * 2.5 - 4 * 4.5 = - 10.5 V
Rab = 7//7 = 3.5 Ω
(3) 合并：
I = (10/3 + 10.5) / (3+3.5) = 2.128 A
Uab = 10/3 - 3 * 2.128 = -3.051 V
(1) 用网孔电流法,左边网孔电流就是 1A .
9 * I1 - 3 * 1 = 2
I1 = 5/9 A
4 * I2 + 2 * 1 = 2
I2 = 0 A
Uab = 6 * 5/9 = 10/3 A
Rab = 3//6 + 2//2 = 3 Ω
(2) 并联分流.
I1 = 7 * 9/14 = 4.5 A
I2 = 7 * 5/14 = 2.5 A
Uab = 3 * 2.5 - 4 * 4.5 = - 10.5 V
Rab = 7//7 = 3.5 Ω
(3) 合并：
I = (10/3 + 10.5) / (3+3.5) = 2.128 A
Uab = 10/3 - 3 * 2.128 = -3.051 V