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/20140824/201408241502485781865.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241502486722702.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241502485781865.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241502486722702.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:AC、灯泡
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150248781313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150248984772.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150249233806.png)
BD、两灯泡串联,每个灯泡分的1.5V电压,电流为0.20A,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150249358790.png)
故选ACD
点评:中等难度。注意小灯泡电阻随电流的增大而增大。
![](http://thumb2018.1010pic.com/images/loading.gif)
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