Why does not a capacitor allow dc current?

Question

How does a capacitor work? What actually happens in between the plates of a parallel plate capacitor? How charge is induced on the opposite plate? Why it is meant only for ac?

How does a capacitor work? What actually happens in between the plates of a parallel plate capacitor? How charge is induced on the opposite plate? Why it is meant only for ac? Can anyone illustrate the original process of charging and discharging?

Answer 1

Because the capaitors is actually like a battery in DC. It stores the electrons and releases them later. Direct current is much more established in farads rather than alternating current which moves in both directions. The plate in a DC capacitor allows current to stick to the plate in one direction and release on the other not the same direction it comes in.

Answer 2

When a DC is applied to a uncharged Capacitor current will flow for few seconds depend up on the time constant of the circuits then when the capacitor is fully charged current flow will stop because capacitor is fully charged to applied voltage. Current only will flow when there is a potential differance.As we know capacitor is a two metal plate seperated by dielectric material is a enery storage device in capacitor energy is stored in the form of voltage

Answer 3

Direct current flows in the direction which capacitors will not allow passage. AC on the other hand flows in two directions, and this is why capacitors can allow AC to pass. For example audio signals through a speaker. If DC were allow to pass, then you get distortion. This is why capacitors are sometimes called "blocking capacitors".

Answer 4

capacitor is charging and discharging device to control flactuation as capacitor use with rectifier for the same. Capacitor use in a fan for create phase difference.

Answer 5

Pure DC will not pass the dielectric,only half wave rectification, or pulse dc together with ac. caps are used in connection with chokes and or resistance to fiter ripple current. Not employed solely for ac. It stores charge ac & dc much like the battery does or static ionization.

Answer 6

in a capacitor the capacitance or the work funcyion is based on the frequency of the current dc does not have a frequency

Answer 7

resistance of a capacitor =1/wc
w= frequency of current used.
for d.c. current w=0 so R= infinity .
hence capacitor does not allow d.c.