题目内容
如图所示的电路中,电源电动势E =" 6.0V" ,内阻r =" 0.6Ω" ,电阻R2 =" 0.5Ω" ,当开关S断开时,电流表的示数为1.5A,电压表的示数为3.0V ,试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305127643440.jpg)
小题1:电阻R1和R3的阻值
小题2:当S闭合后,求电压表的示数和R2上消耗的电功率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305127643440.jpg)
小题1:电阻R1和R3的阻值
小题2:当S闭合后,求电压表的示数和R2上消耗的电功率
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512764748.png)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512811891.png)
(1)
断开时,
,(1分)
故
(2分)
(2)
闭合时,
,(1分)
电压表示数:
(2分)
消耗的电功率:
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512842321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512857796.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512889860.png)
故
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512764748.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512842321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305129671207.png)
电压表示数:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130513076891.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130513107361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130512811891.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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