题目内容
如图所示是某款理发用的电吹风的电路图,它主要由电动机M和电热丝R构成。当闭合开关S1、S2后,电动机驱动风叶旋转,将空气从进风口吸入,经电热丝加热,形成热风后从出风口吹出。已知电吹风的额定电压为220V,吹冷风时的功率为120W,吹热风时的功率为1000W。关于该电吹风,下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022483234400.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022483234400.jpg)
A.电热丝的电阻为55 Ω |
B.电动机的电阻为![]() |
C.当电吹风吹冷风时,电热丝每秒钟消耗的电能为120 J |
D.当电吹风吹热风时,电动机每秒钟消耗的电能为1120 J |
A
试题分析:当吹热风时,电热丝消耗的电功率为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002248354833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002248370606.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250022483851140.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002248401343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002248401375.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目