题目内容
如图所示,理想变压器原、副线圈匝数比为4∶1,原线圈接u=
sin(100πt)V的交变电压,副线圈上接有灯泡A、理想电感线圈L及理想电压表
。下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020541932553.png)
A.副线圈中电流的频率为100Hz
B.灯泡A两端电压为55V
C.若u有效值不变,频率增大,则灯泡A将变暗
D.若u有效值不变,频率增大,电压表
的示数仍不变
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002054162486.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002054177429.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250020541932553.png)
A.副线圈中电流的频率为100Hz
B.灯泡A两端电压为55V
C.若u有效值不变,频率增大,则灯泡A将变暗
D.若u有效值不变,频率增大,电压表
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002054209429.jpg)
CD
试题分析:根据原线圈中交变电压的瞬时值表达式u=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002054162486.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002054240429.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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