该题用网孔电流法较好.
设上网孔电流为I11,左网孔电流为I22,右网孔电流为I33.且都假设为顺时针转向.
即:I11(R1+R6+R2)-I22*R1-I33*R2=UB
-I11+I22(R1+R4+R3)-I33*R2=U3
-I11*R2-I22*R3+I33*(R3+R2+R5)=-U3
该题用网孔电流法较好.
设上网孔电流为I11,左网孔电流为I22,右网孔电流为I33.且都假设为顺时针转向.
即:I11(R1+R6+R2)-I22*R1-I33*R2=UB
-I11+I22(R1+R4+R3)-I33*R2=U3
-I11*R2-I22*R3+I33*(R3+R2+R5)=-U3