题目内容
如图所示,一理想变压器原线圈的匝数为n1,副线圈的匝数为n2,原线圈两端a、b接正弦交流电源,电压表的示数为220V,电流表A1的示数为0.20A,电流表A2的示数为1.0A。下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241303004609618.png)
A.电阻R的阻值为44Ω
B原副线圈的匝数比为1: 5
C.电阻R 消耗的功率为44W
D.若电阻R的阻值增大,则A1的示数增大
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241303004609618.png)
A.电阻R的阻值为44Ω
B原副线圈的匝数比为1: 5
C.电阻R 消耗的功率为44W
D.若电阻R的阻值增大,则A1的示数增大
AC
根据原副线圈功率相等,可知
,所以
=44V,根据欧姆定律:R=U/I=44Ω,A对;原副线圈匝数比
,B错;电阻R 消耗的功率为P=
=44W,C对;若电阻R的阻值增大,匝数不变所以副线圈电压不变,电流减小,两个电流表示数均较小,D错,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130300507566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130300538377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130300554970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130300585450.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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