更新时间2019-11-18 12:09:29
3-2
I2R2 - Us2 = I4R3,15I2 - 5 = 20I4,I4 = 3I2/4 - 1/4;
I1 = I2 - Is + I4 = I2 - 1 + 3I2/4 - 1/4 = 7I2/4 - 5/4;①
Us1 - I1R1 = I2R2 - Us2,15 - 10I1 = 15I2 - 5,
①代入,10( 7I2/4 - 5/4 ) + 15I2 = 15 + 5,I2 = 1A;
I4 = 3I2/4 - 1/4 = 0.5A;I1 = 7I2/4 - 5/4 = 0.5A; I3 = -Is = -1A 。
3-3
i2 = i3 - Is = i3 - 1;
Us1 + Us2 = i1R1 + ( i1 - i2 )R2,15 + 5 = 10i1 + 15i1 - 15( i3 - 1 )
5i1 - 3i3 = 1;①
Us1 = i1R1 + i3R3,10i1 + 20i3 = 15;②
联立②①,i1 = 0.5;i3 = 0.5;i2 = i3 - 1 = -0.5;
I1 = i1 = 0.5A;I2 = i1 - i2 = 1A;I3 = -Is = -1A;I4 = i3 = 0.5A 。
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