题目内容
如图甲左侧的调压装置可视为理想变压器,负载电路中R=55 Ω,A、V为理想电流表和电压表.若原线圈接入如图乙所示的正弦交变电压,电压表的示数为110 V,下列表述正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002282455019.jpg)
A.电流表的示数为2 A
B.原、副线圈匝数比为1∶2
C.电压表的示数为电压的有效值
D.原线圈中交变电压的频率为100 Hz
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002282455019.jpg)
A.电流表的示数为2 A
B.原、副线圈匝数比为1∶2
C.电压表的示数为电压的有效值
D.原线圈中交变电压的频率为100 Hz
AC
试题分析:根据电路图可知,电阻R两端的的电压为110V,因此电阻R的电流I==
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000228260434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000228276618.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000228291567.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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