题目内容
根长1m的均匀电阻丝需与一盏“10V,5W”的灯同时工作,电源电压恒为100V,电阻丝阻值R=100Ω(其阻值不随温度而变),现利用分压电路从电阻丝上获取电能使灯正常工作。和灯并联的一段电阻丝的长度范围为:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021075472505.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021075472505.jpg)
A.0-0.1m | B.0.1m-0.2m | C.0.2m-0.3m | D.0.3m-0.4m |
B
试题解析:灯泡的额定电阻RL=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250021075621007.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002107578701.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002107578701.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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