How exactly does a capacitor bypass a.c and blocks d.c?

Question

a capacitor has the formula for its reactance as 1/(2*pie*frequency*capacitance).

according to this formula it blocks dc because dc has 0 frequency and allows ac because ac has some frequency.

but how does a capacitor physically perform this task,please reply.

Answer 1

A capacitor stores charge. With AC, the charge goess in and then comes back out again every cycle. With DC, the charge is trying to always goe in the same direction. So, the capacitor eventually fills up.

Answer 2

From the formula of capacitive reactance
Xc=1/(2*pi*f*C)

In DC, the frequency is equal to 0 HZ. Therefore
Xc=1/(2*pi*0*C)=1/0=infinity. It means there a high resistance thus the current could not flow.

In AC, the frequency has a value greater than zero thus, there would be a value for Xc. Thus, Xc is not equal to infinity and therefore the current could pass on the circuit

Answer 3

Current through a capacitor can only flow while the dielectric within the capacitor is being charged. The surplus of negative charge (electrons) on one plate of the capacitor along with the positive charge (actually, an absence of electrons) on the other plate give rise to a current if the polarity across the capacitor changes. Current cannot flow after the capacitor is charged, it can only flow during charge or discharge.

HTH

Doug

Answer 4

maybe try it out so that you will know the answer to your question if it's yes or no and why