题目内容
(2011年富阳二中高三月考)在某交变电流电路中,有一个正在工作的理想变压器,如图所示.它的原线圈匝数n1=600匝,交流电源的电动势e=311 sin(100πt) V(不考虑其内阻),电压表和电流表对电路的影响可忽略不计,原线圈串联一个额定电流为0.2 A的保险丝,副线圈匝数n2=120匝,为保证保险丝不被烧断,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412234683037.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241412234683037.jpg)
A.负载功率不能超过62 W |
B.副线圈电流最大值不能超过1 A |
C.副线圈电路中的电阻R不能小于44 Ω |
D.副线圈电路中电压表的读数为62 V |
C.
由
=
得U2=44 V,D错;由
=
得I2≤1 A,所以负载功率最大为P2=U2I2≤44 W,A错;副线圈中的电流最大值为Im=
A,故B错;由R=
得R≥44 Ω,C对.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223468469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223514411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223546411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223592418.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223639344.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141223686536.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目