如图2所示直流电路中,电阻和电压源均为已知,试求各支路电流,求准确详细步骤

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如图2所示直流电路中,电阻和电压源均为已知,试求各支路电流,求准确详细步骤
如图2所示直流电路中,电阻和电压源均为已知,试求各支路电流,

求准确详细步骤

如图2所示直流电路中,电阻和电压源均为已知,试求各支路电流,求准确详细步骤
简单一点,可以采用叠加法:
1、当只有50V电源时,各电流计算如下.总电阻R = 60Ω + 20Ω//40Ω//40Ω = 70Ω,于是,Ia =50V/70Ω = 5/7A;Ib = -5/7/2 = -5/14 A;Ic = 5/7/2/2 = 5/28 A;Id = -5/7/2/2 = -5/28A.
2、当只有40V电源时,各电流计算如下.总电阻R = 40Ω + 20Ω//40Ω//60Ω = (50 +10/11)Ω,于是,Id = - 40V/(50+10/11)Ω = -11/14A;Ib = 11/14x(10+10/11)/20 = 6/14 A;Ic = - 11/14x(10+10/11)/40 = - 3/14 A;Ia = 11/14x(10+10/11)/60 = 2/14 A.
3、上述结果叠加后,最终得到:Ia = 5/7+2/14 = 6/7 A;Ib = -5/14+6/14 = 1/14 A;Ic = 5/28 -3/14 = - 1/28 A;Id = -5/28 -11/14 = - 27/28 A.