题目内容
理想变压器原、副线圈匝数比为20:1,两个分别标有“12V,6W”、“12V,12W”的小灯泡并联在副线圈的两端,当两灯泡都正常工作时,原线圈电路中电压表和电流表(可视为理想的)的示数分别是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000365958187.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000365958187.png)
A.120V,0.10A | B.240V,0.025A |
C.120V,0.05A | D.240V,0.075A |
D
试题分析:灯泡正常工作,电压为额定电压,所以副线圈电压U2 = 12V,电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250000365951163.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000036642653.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000036658556.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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