电工面试问题之七

爱城电工 · 发表于 2009-1-12 19:16

为什么电容器阻断DC 而通AC?

牛肉粉丝 · 发表于 2009-1-12 21:49

Xc=1/(2Pifc)
if 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 · 发表于 2009-1-13 18:45

原帖由 爱城电工 于 2009-1-12 19:16 发表
+ O4 l6 M4 K7 a9 A( Y" q2 m& [为什么电容器阻断DC 而通AC?

I would like to ask a question, just for curiosity, if you do not mind.

Is that a real question during your interview for an electrician job?

shenyang-china · 发表于 2009-1-14 02:52

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

wolfgan · 发表于 2009-1-16 21:47

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！！！

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电工面试问题之七

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