电路如图5.1所示。开关S在t＝0时闭合。则i L （0 ＋ ）为多大？ i L （t） https://assets.asklib.com/images/image2/2017052116050368271.jpg

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

A .https://assets.asklib.com/psource/2015110111313843578.jpg B .https://assets.asklib.com/psource/2015110111315151618.jpg C .https://assets.asklib.com/psource/2015110111320582310.jpg D .https://assets.asklib.com/psource/2015110111323019711.jpg

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 . 0 B . -5 C . 5 D . 10

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 . 2.5 B . -2 C . 2 D . -2.5

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 . 0 B . 7.64 C . 10 D . 12

A . 0.1 B . 0.05 C . 0 D . 0.2

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' />

-1A 2A 1A 0A

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

<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111311967106.jpg' /> A．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111313843578.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111315151618.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111320582310.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/18381001-18384000/18381704/2015110111323019711.jpg' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18525001-18528000/18526549/201511011401317578.jpg' /> A．2.5 B． -2 C． 2 D． -2.5

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' />

如图所示电路原已稳定，t =0时将开关S打开，求i(0+)及u(0+)。 <img src='https://img2.soutiyun.com/ask/2019-11-15/942681202242036.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' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18498001-18501000/18500204/2015110114043515136.jpg' /> A．0 B． -5 C． 5 D． 10