求开关闭合后的初始值及稳态值。

A . 清洁光敏遮断器或更换光敏三极管 B . 更换光敏遮断器 C . 调整簧片开关式字车初始位置传感器的簧片弹性 D . 更换簧片开关

A . 4.5-0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.B . 4.5-4.5https://assets.asklib.com/psource/2015102909090699957.jpg A.C . 3+0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.D . 4.5-0.5https://assets.asklib.com/psource/2015102909090699957.jpg A.

A . A B . B C . C D . D

A . ['['L/R3B .https://assets.asklib.com/psource/2015110111201458733.jpg C .https://assets.asklib.com/psource/2015110111202959174.jpg D .https://assets.asklib.com/psource/201511011120497322.jpg

A .https://assets.asklib.com/psource/2015110111243680324.jpg B .https://assets.asklib.com/psource/2015110111245222003.jpg C .https://assets.asklib.com/psource/2015110111250596372.jpg D .https://assets.asklib.com/psource/2015110111251843805.jpg

A .https://assets.asklib.com/psource/201511020947074085.jpg B .https://assets.asklib.com/psource/2015110209472042024.jpg C .https://assets.asklib.com/psource/2015110209473654095.jpg D .https://assets.asklib.com/psource/2015110209474940538.jpg

如图5.4.10所示电路中，t＜0时，电路已处于稳态，t=0时开关闭合，求t≥0₊时ic(t)。 <img src='https://img2.soutiyun.com/ask/2020-02-27/951671752554798.jpg' />

在图3.03中，开关S闭合前电路已处于稳态，试间闭合开关瞬间，电流初始值i(0+)为(1)1A;(2)0.8A;(3)0A <img src='https://img2.soutiyun.com/ask/2020-06-19/961426452083398.png' />

<img src='https://img2.soutiyun.com/ask/2020-06-17/961264067053561.png' />

图示电路在开关S闭合前电路已处于稳态，在t=0时刻开关闭合。试求开关闭合后的u_C(t)及i_L(t)。 <img src='https://img2.soutiyun.com/ask/2020-11-30/975606777612099.png' />

电路如图题6-33所示,求<img src='https://img2.soutiyun.com/ask/2020-10-15/971631143700658.png' /><img src='https://img2.soutiyun.com/ask/2020-10-15/971631160210602.png' />已知开关在t=0时闭合,闭合前电路已处于稳态. <img src='https://img2.soutiyun.com/ask/2020-10-15/971631172391299.png' />

电路如图所示，Is=3A，Us=18V，R1=3Ω，R2=6Ω，L=2H，在t＜0时电路已处于稳态。当t=0时开关S闭合，求t≥0时的i_L、u和i(t)。 <img src='https://img2.soutiyun.com/ask/uploadfile/5499001-5502000/c59f97db78e22204b83620ad1e292af9.jpg' />

<img src='https://img2.soutiyun.com/ask/2020-10-09/971114311942831.jpg' />

图4-4所示电路,t=0时,开关S闭合,求v_c(t). <img src='https://img2.soutiyun.com/ask/2020-12-01/975674141499809.png' />

电路如题6-17图所示，在t＜0时.电路已处于稳态，t=0时开关S由1端接至2端，求t＞0时的电容电压u_c(t)。 <img src='https://img2.soutiyun.com/ask/2020-08-20/966785880595594.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18498001-18501000/18500196/2015110114041431885.jpg' /> A．2s B． 0.5s C． 50ms D． 1s

题3.19图所示电路己处于稳态，当t=0时开关S由a切换至b，求t≥0时的电流i(t)和电压uR(t)。 <img src='https://img2.soutiyun.com/ask/2020-09-17/969183881171787.png' />

电路如图题7-1所示,开关在t=0时打开,打开前电路已处于稳态.求<img src='https://img2.soutiyun.com/ask/2020-10-15/971634467034742.jpg' />. <img src='https://img2.soutiyun.com/ask/2020-10-15/971634480570516.jpg' />