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Kiran D
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Join Date: Aug 2010
Posts: 26

Capacitor with DC supply

11/09/2010 1:40 AM

Capacitor acts as almost zero resistance for AC supply then why it doesn't short AC+ and AC- ?

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Kiran
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raj151857
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Join Date: Nov 2010
Location: New Delhi India
Posts: 8
#1

Re: Capacitor with DC supply

11/09/2010 2:54 AM

Dear Kiran,

Zero resistance does not mean short circuit. There is dielectric in between which prevent short circuit. If you increase the voltage beyond rated voltage at certain voltage it result in breaking of dielectric barrier & cause short circuit (Blast).

Trust you querry is been answered.

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JohnDG
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#2

Re: Capacitor with DC supply

11/09/2010 3:40 AM

A capacitor (unless it's a very large one) does not act as "almost zero resistance for AC supply".

The impedance of a capacitor is 1/ωC = 1/2πfC.

That means that a 0.1μF capacitor with a 50Hz line frequency will have an impedance of about 32kΩ, or about 27kΩ at 60Hz.

[Purists: note that I'm steering clear of complex complications].

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user-deleted-1105
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#3
In reply to #2

Re: Capacitor with DC supply

11/09/2010 5:58 AM

I a purrrrr-ist does that count?

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PeterT
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#4
In reply to #3

Re: Capacitor with DC supply

11/10/2010 3:07 PM

Only if these are cat-pacitors.

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