求电流I和电压U

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求电流I和电压U求电流I和电压U 求电流I和电压UVb=12*8/(16+8)=4VVc=12*(18//6)/(18//6+7.5)=12*4.5/(4.5+7.5)=4.5VVa=0.5

求电流I和电压U
求电流I和电压U
 

求电流I和电压U

Vb = 12 * 8 / (16+8) = 4V

Vc = 12 * (18//6) / (18//6 + 7.5) = 12 * 4.5 / (4.5 + 7.5) = 4.5V

Va = 0.5 * Vc = 2.25v

U = Va - Vb = 2.25 - 4 = -1.75V

I = Vc / 6 = 4.5/6 = 0.75A