题目内容
如图甲所示,理想变压器原副线圈的匝数比为10:1,b是原线圈的中心抽头,图中电表均为理想的交流电表,定值电阻R=10Ω,其余电阻均不计.从某时刻开始在原线圈c、d两端加上如图乙所示的交变电压。则下列说法中正确的有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052050426836.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052050426836.jpg)
A.当单刀双掷开关与a连接时,电压表的示数为31.1V |
B.当单刀双掷开关与b连接且在0.01s时,电流表示数为2.2A |
C.当单刀双掷开关由a拨向b时,副线圈输出电压的频率变为25Hz |
D.当单刀双掷开关由a拨向b时,原线圈的输入功率变大 |
D
试题分析:由图象可知,电压的最大值为311V,交流电的周期为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005205057539.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005205073563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005205089456.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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