题目内容
如图所示,电源电动势
=10V,
=3Ω,
=6Ω,
=30μF,闭合开关
,电路稳定后, 路端电压
=9V,求:
(1)电路稳定后通过
的电流;
(2)电源的内阻
;
(3)若开关
断开,求这以后通过
的总电量。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241513599253299.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151358927320.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359005327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359099359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359161306.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359270311.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359395313.png)
(1)电路稳定后通过
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359005327.png)
(2)电源的内阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359660260.png)
(3)若开关
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359270311.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151359099359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241513599253299.jpg)
(1)1A(2)1欧姆(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400003635.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400003635.png)
试题分析:(1)K闭合后,通过
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400066328.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400128801.png)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400191600.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400269785.png)
(3)K断开后,流过
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151400331361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241514003931017.png)
点评:本题通过结合电路考察对闭合电路欧姆定律的理解
![](http://thumb2018.1010pic.com/images/loading.gif)
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