题目内容
如图所示为汽车蓄电池与车灯(电阻不变)、启动电动机组成的电路,蓄电池内阻为0.05Ω,电流表和电压表均为理想电表.只接通S1时,电流表示数为10A,电压表示数为12V,再接通S2,启动电动机工作时,电流表示数变为8A,则此时通过启动电动机的电流是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026134488900.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026134488900.png)
A.2A | B.8A | C.50A | D.58A |
C
试题分析:由题意知,电源电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613463850.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613479757.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613494763.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613510765.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613526719.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002613541651.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.2A | B.8A | C.50A | D.58A |