题目内容
如图所示的电路中,P为滑动变阻器的滑片。保持理想变压器的输入电压
不变,闭合电建S,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500490520539484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004905174349.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500490520539484.png)
A.P向下滑动时,灯L变亮 |
B.P向下滑动时,变压器的输出电压不变 |
C.P向上滑动时,[学-科网变压器的输入电流减小 |
D.P向上滑动时,变压器的输出功率变大 |
BD
试题分析:由于理想变压器输入电压不变,则副线圈电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004905220377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004905236324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004905252293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004905267545.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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