题目内容
图甲所示的变压器原、副线圈匝数比为3:1,图乙是该变压器cd输入端交变电压u的图像,L1、L2、L3、L4为四只规格均为“9 V,6 W”的相同灯泡,各电表均为理想交流电表.以下说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500474622211614.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500474622211614.png)
A.ab输入端电压的瞬时值表达式为![]() |
B.电流表的示数为2A,且四只灯泡均能正常发光 |
C.流过灯L2的电流每秒钟方向改变50次 |
D.ab输入端输入功率Pab="18" W |
B
试题分析:由图像可知,cd输入端电压的瞬时值表达式为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047462691114.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004746253883.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004746300909.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250047463151067.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004746331678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004746347917.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004746362890.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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