题目内容
如图所示,理想变压器的原、副线圈匝数之比为n1:n2=3:1,原线圈回路中的电阻A与副线圈回路中的负载电阻B的阻值相等。a、b端加一定交流电压U=311sin100πt(V)后,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241336404143496.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241336404143496.png)
A.两电阻两端的电压比UA:UB=3:1 |
B.两电阻中的电流之比IA:IB=1:3 |
C.两电阻消耗的电功率之比PA:PB=1:1 |
D.电阻B两端的电压表的示数UB=66V |
BD
由
输出电压有效值为
,输出电流为
,输入电流为
,电阻A两端电压为
,电压之比为1:3,输入输出电流之比为1:3,B对、电功率之比为1:9,C错;D对;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241336404451119.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133640476598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133640523655.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133640554645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133640601596.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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