题目内容
如图所示的电路中,R1=1Ω,R2=6Ω,电源内阻r=1Ω,若开关闭合后,铭牌上标有“6V 12W”的电动机刚好正常工作,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010504722485.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250010504722485.jpg)
A.流过电动机的电流为6A |
B.流过R2上的电流为1A |
C.电源电动势E=12V |
D.若电动机线圈电阻为0.5Ω,则电动机输出功率为7.5W |
BC
试题分析:闭合开关电动机正常工作,则电动机与R2两端电压为6V,流过电动机的电流
由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001050488504.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001050519632.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001050534506.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001050550453.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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