电工面试问题之七

爱城电工

为什么电容器阻断DC 而通AC?

牛肉粉丝

Xc=1/(2Pifc)
( ^' M3 h; j3 p- Zif f=0 Xc is infinite, so capacitor block DC.
for AC, frequence is 60Hz(in north american), so Xc is a specific value. as a result , it can conduct AC.

MrElectrician

原帖由 爱城电工 于 2009-1-12 19:16 发表
* l) @6 m( \4 G9 N, O5 |* S为什么电容器阻断DC 而通AC?

3 d, ~( o& u& t  p8 p
2 p; E& Q7 M& P7 q+ ?( eI would like to ask a question, just for curiosity, if you do not mind.
5 u, \1 |2 `1 ~  }2 A
0 D$ f7 o2 b+ i5 B! PIs that a real question during your interview for an electrician job?

shenyang-china

Ha Ha, I think it is a joke. If it  was real, Lz must have lost his job.

wolfgan

电容器你可以想象成为一个容器，是用来装电子的，但是电子是不可以直接从这个容器里跑出去的，他是靠电压的变化或电流的变化来改变两级的电量而形成电流，所以对直流起到了一个不通的，而交流可以通过！！！