题目内容
如图10-2-15所示,理想变压器原、副线圈匝数比为3∶1,副线圈接三个相同的灯泡,均能正常发光,原线圈上串联一相同的灯泡A.则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206356132750.jpg)
图10-2-15
A.灯A也能正常发光
B.灯A将会烧坏
C.灯A比另三个灯都暗
D.不能确定
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206356132750.jpg)
图10-2-15
A.灯A也能正常发光
B.灯A将会烧坏
C.灯A比另三个灯都暗
D.不能确定
A
原线圈、副线圈电流之比
,所以
,通过每灯的电流等于其额定电流,有
,而通过灯A的电流
,所以也能正常发光.故选项A正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120635628738.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120635675537.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120635706655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120635722735.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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