题目内容
如图甲所示,理想变压器原、副线圈的匝数比为3∶1,L1、L2、L3为三只规格均为“9V 6W”的相同灯泡,各电表均为理想交流电表,输入端接入如图乙所示的交变电压,则以下说法中正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500505343810862.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500505343810862.png)
A.电流表的示数为2A |
B.电压表的示数为![]() |
C.副线圈两端接入耐压值为9V的电容器能正常工作 |
D.变压器副线圈中交变电流的频率为50Hz |
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试题分析:变压器初级电压有效值为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005053469978.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050534851199.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250050535001060.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005053516459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005053531988.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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