题目内容
如图所示电路中,电源电压u=311sinl00πt(V),A、B间接有"220V 440W”的电暖宝、“220V 220W”的抽油烟机、交流电压表及保险丝.下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035159232786.jpg)
A.交流电压表的示数为31l V
B.电路要正常工作,保险丝的额定电流不能小于3
A
C.电暖宝发热功率是抽油烟机发热功率的2倍
D.工作1 min抽油烟机消耗的电能为1.32×104J
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035159232786.jpg)
A.交流电压表的示数为31l V
B.电路要正常工作,保险丝的额定电流不能小于3
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003515938344.png)
C.电暖宝发热功率是抽油烟机发热功率的2倍
D.工作1 min抽油烟机消耗的电能为1.32×104J
D
试题分析:电压表在交流电路中对应交流有效值,由于电源电压u=311sinl00πt(V),故有效值为220V,所以A错误;因保险丝融化电流指有效值,电暖宝的电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003515970699.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003516001685.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003516016609.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003516032867.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目