【简答题】
A、求图所示电路在开关S打开和闭合两种情况下的等效电阻R<sub>absub>。r /> rc="https://img.ppkao.com/2019-04/wangxuan/2019042616331161571.jpg" />
A、求图所示电路在开关S打开和闭合两种情况下的等效电阻R<sub>absub>。r /> rc="https://img.ppkao.com/2019-04/wangxuan/2019042616331161571.jpg" />
A、求图所示电路的戴维宁等效电路和诺顿等效电路。r /> rc="https://img.ppkao.com/2019-04/wangxuan/2019042916490594208.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" />