Why capacitor blocks d.c. but allows a.c., Physics

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Q. A capacitor blocks d.c. but allows a.c. Why?

Capacitive reactance   XC = 1/ωC

      = 1 / 2πνC

Where ν is the frequency of the a.c. supply.

In a d.c. circuit,ν = 0 ∴ XC = ∞

Thus a capacitor tenders infinite resistance to d.c. and blocks the d.c.

For an a.c., the capacitive reactance differs inversely as the frequency of a.c. and as well inversely as the capacitance of the capacitor.


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