题目内容
如图所示,理想变压器原线圈的匝数n1=1000匝,两个副线圈的匝数分别为n2=50匝和n3=100匝,L1是“6V、2W”的小灯泡,L2是“12V、4W”的小灯泡。当原线圈两端加上交变电流时,L1、L2都正常发光,那么,原线圈中的电流为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234549243350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234549243350.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
C
因为灯泡正常发光,所以可知U2=6V,根据
,计算可得原线圈电压U1=120V,输出功率和输入功率相等,所以
,计算可得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123455548595.png)
故选C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123455267982.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123455517927.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123455548595.png)
故选C
![](http://thumb2018.1010pic.com/images/loading.gif)
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