题目内容
如图甲所示,变压器原副线圈的匝数比为3∶1,L1、L2、L3为三只规格均为“9 V,6 W”的相同灯泡,各电表均为理想交流电表,输入端交变电压u的图象如图乙表示.则以下说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414262340410397.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414262340410397.png)
A.电压表的示数为27 V | B.三只灯泡均不能正常发光 |
C.电流表的示数为2 A | D.变压器副线圈两端交变电流的频率为100Hz |
C
本题主要考查的是理想变压器原副线圈匝数¸电流¸电压关系的问题。
所以:
,理想交流电压表测量的电压的有效值,所以电压表的示数为27v,A选项错误;
,所以,
三只灯泡均正常发光,B错误;电流表示数为:
,所以C选项正确;变压器原副线圈的频率是相同的:
,D选项错误;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142623498749.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142623576586.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142623498749.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142623982560.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241426240441085.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142624091901.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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