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A '''capacitor''' is an [[electrical]] component used to store electrical charge, block DC current, or filter low frequencies out of a signal.

A '''capacitor''' is an [[electrical]] component used to store electrical charge, block DC current, or filter low frequencies out of a signal.

They are usually constructed by rolling up two large (in area) sheets of conductive material separated by a (usually very thin) dielectric, or insulating material. Each sheet is then connected to one of the capacitor's leads.

A capacitor consists of two large-area plates of conductive material separated by a thin insulator. To make the structure compact, the plates are made from thin flexible sheets, which can be rolled up. Each sheet is then connected to one of the capacitor's leads.

 

If a current, carried by electrons, is pushed through a capacitor, excess electrons accumulate on one plate. The excess charge repels electrons from the opposite plate, and they leave out the other lead. The longer the current flows, the more charge accumulates and the more [[voltage]] is generated across the capacitor. If the capacitor is then removed from the source of current, the voltage may persist indefinitely.

==See also==

==See also==