题目内容
(供选学物理3-1的考生做)在如图所示的电路中,电源的电动势E =" 6.0" V,内电阻r =" 1.0" Ω,外电路的电阻R = 2.0Ω。闭合开关S后,电路中的电流I等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130007939858.png)
A.6.0 A | B.4.0 A | C.3.0 A | D.2.0 A |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130007939858.png)
D
由闭合电路欧姆定律,得
I=
,故选D
I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241300080021017.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.6.0 A | B.4.0 A | C.3.0 A | D.2.0 A |