【简答题】
A、试用电源等效变换法求图示电路中的电流I。<br /> <img src="https://img.ppkao.com/2018-09/lina/2018090210415085719.jpg" />
A、用结点电压法求如图所示电路的Uub>1ub>和I。<br /> <img src="https://img.ppkao.com/2019-05/leiyawen/2019051609333393120.jpg" />
A、图示电路中,已知Rub>1ub>=10Ω,Rub>2ub>=Rub>3ub>=5Ω,Rub>5ub>=8Ω,iub>S1ub>=1A,iub>S2ub>=2A,iub>S3ub>=3A,iub>S4ub>=4A,iub>S5ub>=5A,uub>S3ub>=5V。以结点0为参考点,求结点电压uub>N1ub>、uub>N2ub>和uub>N3ub>。<br /> <img src="https://img.ppkao.com/2019-04/wangxuan/2019042717293130944.jpg" />