题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318584221.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318599225.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318615672.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143186774520.jpg)
A.交流电的频率为50 Hz |
B.电流表![]() |
C.电流表![]() ![]() |
D.电压表的示数为44 V |
C
由交流电源的电压瞬时值表达式可知
,所以频率
HZ,A项说法正确;理想变压器的电压比等于线圈匝数比,即
,其中原线圈电压的有效值
="220" V,
44 V,故D项说法正确;
1A,故C项说法错误,由电流比与线圈匝数成反比,即
,所以
0.2 A,B项说法正确。综上所述,说法错误的是C项。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318771432.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318786594.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318958495.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318974217.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114318989514.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114319020347.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114319036477.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114319036480.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.交流电的频率为50 Hz |
B.电流表![]() |
C.电流表![]() ![]() |
D.电压表的示数为44 V |