电路如图所示，当t=0时开关闭合，闭合前电路已处于稳态，电流I（t）在t≥0以后的变化规律是（）https://assets.asklib.com/psource/2015102909090997306.jpg

A . 126e-3 B . 126（1-e-3） C . 126（1+e-3） D . 4-3e-3

A .https://assets.asklib.com/psource/2015110111290284798.jpg B .https://assets.asklib.com/psource/201511011129155823.jpg C .https://assets.asklib.com/psource/2015110111293084231.jpg D .https://assets.asklib.com/psource/2015110111294629263.jpg

A . 100 B . 250 C . -250 D . -100

A . 0 B . 0.6 C . 0.3 D . 0.03

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

A .https://assets.asklib.com/psource/2015110111263771750.jpg B .https://assets.asklib.com/psource/2015110111265468337.jpg C .https://assets.asklib.com/psource/2015110111270839970.jpg D .https://assets.asklib.com/psource/2015110111272147763.jpg

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/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' />

-1A 2A 1A 0A

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

<img src='https://img2.soutiyun.com/shangxueba/ask/18495001-18498000/18496804/2015110114005030374.jpg' /> A．0 B． 0.6 C． 0.3 D． 0.03

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' />

图3-19所示电路中开关S1在t=0时闭合，开关S2在t=1s时闭合，试用阶跃函数表示电流i(t)。 <img src='https://img2.soutiyun.com/ask/uploadfile/5493001-5496000/006c63b713099b96077658762cacfaf9.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' />

题图8-10所示电路中，开关闭合已经很久，t=0时断开开关，试求t>0的电阻电流i(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962962316576129.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' />

电路如题图8-12所示，开关断开已经很久，t=0时闭合开关，试求t≥0时的电容电压uC(t)。 <img src='https://img2.soutiyun.com/ask/2020-07-07/962962362290744.png' />