Xc=1/(2Pifc)9 U$ } J$ v9 I, R' Y
if f=0 Xc is infinite, so capacitor block DC.* w, E. z3 w3 S2 {) ^
for AC, frequence is 60Hz(in north american), so Xc is a specific value. as a result , it can conduct AC.
6 y3 K% ^ }/ P/ R; Z
6 g' M% K- V8 G2 p& y
I would like to ask a question, just for curiosity, if you do not mind. ' y N2 Y, S: l ?5 M3 {6 N2 _- b/ c3 s
Is that a real question during your interview for an electrician job?
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发表于 2009-1-12 19:16
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发表于 2009-1-16 21:47
