A、如图所示为电桥电路,已知R<sub>1sub>=1Ω、R<sub>2sub>=2Ω、R<sub>3sub>=2Ω、R<sub>4sub>=4Ω、R<sub>5sub>=5Ω,试求等效电阻R<sub>absub>。r /> rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、如图所示为电桥电路,已知R<sub>1sub>=1Ω、R<sub>2sub>=2Ω、R<sub>3sub>=2Ω、R<sub>4sub>=4Ω、R<sub>5sub>=5Ω,试求等效电阻R<sub>absub>。r /> rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、已知电路如图所示,其中E<sub>1sub>=15V,E<sub>2sub>=65V,R<sub>1sub>=5Ω,R<sub>2sub>=R<sub>3sub>=10Ω。试用支路电流法求R<sub>1sub>、R<sub>2sub>和R<sub>3sub>三个电阻上的电压。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018092817031193342.jpg" />
A、如图所示轮系中,rc="https://img.ppkao.com/2018-08/lina/2018082916323943630.jpg" />,且知n<sub>1sub>=n<sub>5sub>=1500r/min,转向如图所示。求轴A的转速大小和转动方向。r />
rc="https://img.ppkao.com/2018-08/lina/2018082916324399679.jpg" />
A、R<sub>1sub>烧坏,R<sub>2sub>不会烧坏 B、R<sub>1sub>,R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏,R<sub>2sub>烧坏 D、R<sub>1sub>,R<sub>2sub>均未烧坏
A、R<sub>1sub>〉R<sub>3sub>〉R<sub>2sub> B、R<sub>1sub>=R<sub>2sub>=R<sub>2sub> C、R<sub>1sub>〈R<sub>3sub>〈R<sub>2sub> D、都不对
A、如图所示电路中,u<sub>Ssub>=10sin314tV,R<sub>1sub>=2Ω,R<sub>2sub>=1Ω,L=637mH,C=637μF,求电流i<sub>1sub>,i<sub>2sub>和电压u<sub>csub>。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018092818010827576.jpg" />
A、保持U<sub>ccsub>,R<sub>Bsub>一定,减小R<sub>csub> B、保持U<sub>ccsub>,R<sub>Bsub>一定,增大R<sub>csub>