题目内容
如图所示,理想变压器原、副线圈的匝数比n1:n2=1:3,次级回路中联入三个均标有“36V,40W”的灯泡, 且均正常发光,那么, 标有“36V、40W”的灯泡A ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123123575826.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123123575826.png)
A.也正常发光 | B.将被烧毁 |
C.比另三个灯暗 | D.无法确定 |
A
本题考查理想变压器。由题意知副线圈电压
,由变压器原理,
,原线圈电压
,所以灯泡A两端的电压也是36V,A也可以正常发光,A对BCD错;选A。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123123606854.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123123621653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123123668898.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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