题目内容
如图,是一个小型电风扇电路简图,其中理想变压器的原、副线圈的匝数比为n:1,原线圈接电压为U的交流电源,输出端接有一只电阻为R的灯泡L和风扇电动机D,电动机线圈电阻为r。接通电源后,电风扇正常运转,测出通过风扇电动机的电流为I,则下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037426884264.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037426884264.png)
A.风扇电动机D两端的电压为![]() |
B.理想变压器的输入功率为![]() |
C.风扇电动机D输出的机械功率为![]() |
D.若电风扇由于机械故障被卡住,则通过原线圈的电流为![]() |
CD
试题分析:风扇正常运转,为非纯电阻电路,风扇电动机的两端电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742782492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742797581.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742813578.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742828508.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742844554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742860657.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003742875881.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037428911100.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250037429061007.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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