题目内容
一理想变压器原、副线圈的匝数比为100∶1,原线圈输入电压的变化规律如图甲所示,副线圈所接电路如图乙所示,P为滑动变阻器的触头。下列说法正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500435888310359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500435888310359.png)
A.电压表的读数为3.1V | B.P向左移动时,电压表的示数增大 |
C.P向右移动时,原线圈的电流减小 | D.P向右移动时,变压器的输出功率增大 |
D
试题分析:原线圈电压的有效值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004358898971.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004358914966.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目