A、图示电路,已知R<sub>1sub>=5Ω,R<sub>2sub>=4Ω,R<sub>3sub>=6Ω,求A、B两点间的电压U<sub>ABsub>。r /> rc="https://img.ppkao.com/2018-08/lina/201808200843294916.jpg" />
A、图示电路,已知R<sub>1sub>=5Ω,R<sub>2sub>=4Ω,R<sub>3sub>=6Ω,求A、B两点间的电压U<sub>ABsub>。r /> rc="https://img.ppkao.com/2018-08/lina/201808200843294916.jpg" />
A、图示电路中,已知R<sub>1sub>=10Ω,R<sub>2sub>=R<sub>3sub>=5Ω,R<sub>5sub>=8Ω,i<sub>S1sub>=1A,i<sub>S2sub>=2A,i<sub>S3sub>=3A,i<sub>S4sub>=4A,i<sub>S5sub>=5A,u<sub>S3sub>=5V。以结点0为参考点,求结点电压u<sub>N1sub>、u<sub>N2sub>和u<sub>N3sub>。r /> rc="https://img.ppkao.com/2019-04/wangxuan/2019042717293130944.jpg" />
A、求图示电路中R<sub>3sub>为何值时,R<sub>5sub>支路中的电流I<sub>5sub>=0。r /> rc="https://img.ppkao.com/2018-08/lina/2018082008481339514.jpg" />
A、图示三极管放大电路,已知U<sub>ccsub>=12V,R<sub>Csub>=5kΩ,三极管的β=100,r<sub>besub>=2.5kΩ,R<sub>Bsub>=1MΩ,U<sub>BEsub>忽略不计,C<sub>1sub>、C<sub>2sub>足够大。r /> rc="https://img.ppkao.com/2018-08/lina/2018082009234328254.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、图示电路中,U=220V,S闭合时,U<sub>Rsub>=80V,P=320W;S断开时,P=405W,电路为电感性,求R、L<sub>Xsub>和C<sub>Xsub>。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018093016472464610.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、已知R<sub>1sub>=10KΩ,R<sub>2sub>=66KΩ,C=10uF。r /> (1)判断555定时器组成的是何种电路?r /> (2)试画出Uo的波形。r /> rc="https://img.ppkao.com/2019-04/wangjue/2019041616051721216.jpg" />