题目内容
如图所示的电路中.电源电动势为E.内阻为R.
和
为相同的灯泡,每个灯泡的电阻和定值电阻阻值均为R.电压表为理想电表.K为单刀双掷开关,当开关有 l位置打到2位置时,下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028037875824.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028037875824.jpg)
A.![]() ![]() |
B.![]() ![]() |
C.电源内阻的发热功率将变小 |
D.电压表读数将变小 |
D
试题分析:开关掷到位置1时,灯泡
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803896784.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803896856.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803927819.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803958688.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028040051009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804021883.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804036837.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804067833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804114892.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803755313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002803771341.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002804145478.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.![]() ![]() |
B.![]() ![]() |
C.电源内阻的发热功率将变小 |
D.电压表读数将变小 |