题目内容
如图所示的电路中,定值电阻R的阻值为10
,电动机M的线圈电阻值为2
,a、b两端加有44V的恒定电压,理想电压表的示数为24伏,由此可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038247141854.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003824652333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003824652333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250038247141854.jpg)
A.通过电动机的电流为12A |
B.电动机的输出功率为40W |
C.电动机的线圈在1min内产生的热量为480J |
D.电动机的效率为83.3% |
BCD
试题分析:通过电动机的电流I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003824730744.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003824761791.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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