A、I1/I2=2，P1/P2=2
B、I1/I2=2，P1/P2=4
C、I1/I2=1/2，P1/P2=1/2
D、I1/I2=2，P1/P2=1/4
更多“两电阻相并联，已知R<sub>1</sub>/R<sub>2</sub>=1/2，则流入电阻的电流之比I1/I2、功率之比P1/P2分别是（）。”相关的问题
A、（R<sub>1sub>+R<sub>2sub>）/R<sub>1sub>R<sub>2sub> B、R<sub>1sub>R<sub>2sub>/（R<sub>1sub>+R<sub>2sub>） C、R<sub>1sub>+R<sub>2sub> D、R<sub>1sub>R<sub>2sub>
A、R<sub>1sub>与R<sub>3sub>串联后与R<sub>2sub>并联 B、R<sub>1sub>与R<sub>3sub>并联后与R<sub>2sub>串联 C、R<sub>1sub>与R<sub>2sub>并联后与R<sub>3sub>串联 D、R<sub>1sub>与R<sub>2sub>串联后与R<sub>3sub>并联
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>。rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、如图所示为R－L－C并联的正弦电路，已知R=50Ω、L=16mH、C=40μF，接于有效值为U=220V的工频电源上，试求I<sub>Rsub>、I<sub>Lsub>、I<sub>Csub>、I。rc="https://img.ppkao.com/2018-05/tangxueping/2018051016121530201.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。rc="https://img.ppkao.com/2018-09/tangxueping/2018092817031193342.jpg" />
A、R′＞R；R〞＞R；R′＞R〞 B、R′＜R；R〞＜R；R′＜R〞 C、R′＞R；R〞＜R；R′＜R〞 D、无法判断
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