题目内容
一个标有“6V、3W”的灯泡,不考虑其电阻随温度的变化. 求:
小题1:它的电阻为多大?正常工作时电流多大?
小题2:现给定一电动势为9V,内阻为0.4Ω的电源与灯泡相连,要想使灯泡正常发光,应在电路中串联一多大阻值的电阻?
小题1:它的电阻为多大?正常工作时电流多大?
小题2:现给定一电动势为9V,内阻为0.4Ω的电源与灯泡相连,要想使灯泡正常发光,应在电路中串联一多大阻值的电阻?
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350419538.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350434651.gif)
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350450276.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350465423.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350419538.gif)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350497545.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125350434651.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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