题目内容
在如图所示的电路中,电源电动势为3.0V,内阻不计,L1、、L2、L3为3个相同规格的小灯泡,这种小灯泡的伏安特性曲线如图所示.当开关闭合后,下列判断正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014458141840.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014458303420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014458141840.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014458303420.png)
A.灯泡L1的电阻为12Ω |
B.通过灯泡L1的电流为灯泡L2电流的2倍 |
C.灯泡L1消耗的电功率为0.75W |
D.灯泡L2消耗的电功率为0.30W |
ACD
试题分析:由电路图可知:L1两端的电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001445861580.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001445876589.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014458921044.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014459231053.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001445939673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001445954667.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001445986969.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250014460011064.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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