题图224所示电路可用来作为（）https://assets.asklib.com/psource/2015061112220110046.jpg

<img src='https://img2.soutiyun.com/ask/2021-01-03/978524981261597.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-03/978531322948321.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-07/962961960815781.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961967106141.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961973184488.png' />

电路如题图12-19所示。已知<img src='https://img2.soutiyun.com/ask/2020-07-07/962980568947105.png' />求u(t)和电源发出的平均功率。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962980580359758.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962980588114202.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962980593054484.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962980598822814.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962980606387247.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-07/962960491085717.png' />

是 否

A．理想电压源吸收功率，理想电流源发出功率，电路A吸收功率； B．理想电压源发出功率，理想电流源吸收功率，电路A吸收功率； C．理想电压源发出功率，理想电流源吸收功率，电路A发出功率。 D．理想电压源吸收功率，理想电流源发出功率，电路A发出功率。

若用节点法求题图所示电路中的电流<img src='https://img2.soutiyun.com/latex/latex.action' />和<img src='https://img2.soutiyun.com/latex/latex.action' />，试列出所需的方程。(不必求解) <img src='https://img2.soutiyun.com/ask/5499001-5502000/d6e63fc12e45a789fe69a41d9c5219b0.jpg' />

<img src='https://img2.soutiyun.com/ask/6081001-6084000/82d33409f9344d0e7fe6df86fea9619c.jpg' />

如题图E3-19所示电路，已知<img src='https://img2.soutiyun.com/ask/2020-11-14/974193896718043.png' />试求电流i。 <img src='https://img2.soutiyun.com/ask/2020-11-14/974193908480716.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962893799329117.png' /><img src='https://img2.soutiyun.com/ask/2020-07-06/962893808339632.png' />

<img src='https://img2.soutiyun.com/ask/2020-11-15/974325578118988.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962894436190544.png' /><img src='https://img2.soutiyun.com/ask/2020-07-06/962894441876869.png' />

题图10-50所示单口网络工作于正弦稳态，已知us(t)=<img src='https://img2.soutiyun.com/ask/2020-07-07/96297017944186.png' />试求单口网络的戴维宁等效电路。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962970193210647.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962970201021094.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962970211392687.png' />

在题图所示电路中，F与A、B的逻辑关系是() <img src='https://img2.soutiyun.com//1/2021-05-26/990876016471773.png' /> <img src='https://img2.soutiyun.com//1/2021-05-26/990876028690504.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-07/962965159186717.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962965170045339.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962894620121064.png' />

A．3 B．2 C．1 D．2

<img src='https://img2.soutiyun.com/ask/2020-07-07/96296176778574.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961778526355.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962961788372918.png' />

题图11-5所示电路中，已知<img src='https://img2.soutiyun.com/ask/2020-07-07/962977146182334.png' />试求20Ω电阻吸收的平均功率。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962977155298856.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962977161434207.png' /><img src='https://img2.soutiyun.com/ask/2020-07-07/962977167285541.png' />

电路如题图8-26所示，开关转换前电路已经稳定，t=0时开关转换，试求t≥0时的电容电压uc(t)和电阻电流i(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962962907971955.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962879455986725.png' />

<img src='https://img2.soutiyun.com/ask/2020-07-06/962894304423007.png' />

题图11-8a电路中，非线性电阻的特性如题图11-8b所示，可近似表示为i=0.01u^2，求其上的u、i。 <img src='https://img2.soutiyun.com/ask/2020-04-30/957112622558393.png' />