题目内容
如图所示,甲是远距离的输电示意图,乙是发电机输出电压随时间变化的图象,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049136296550.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250049136296550.jpg)
A.用户用电器上交流电的频率是100Hz |
B.发电机输出交流电的电压有效值是500V |
C.输电线的电流只由降压变压器原副线圈的匝数比决定 |
D.当用户用电器的总电阻增大时,输电线上损失功率减小 |
D
试题分析:由题图乙知交变电流的周期为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004913644469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004913660592.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004913676559.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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