题目内容
如图所示,把电阻R和电动机M串联接在电路中,已知电阻R与电动机线圈的电阻相等,接通电路后,电动机能正常工作,设电阻R和电动机两端的电压分别为U1和U2,经过时间t,电流通过电阻R做功为W1,产生的电热为Q1,电流通过电动机做功为W2,产生的电热为Q2,则: ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028225381546.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028225381546.png)
A.W1>W2,Q1 = Q2 |
B.W1 = W2,Q1 = Q2 |
C.W1<W2,Q1<Q2 |
D.U1<U2,Q1 = Q2 |
D
试题分析:电阻R与电动机线圈的电阻相等,由焦耳定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002822538566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002822553479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002822569568.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002822585547.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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