An Etymological Dictionary of Astronomy and Astrophysics
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A device for storing electric charge. The simplest sort of capacitors consists of two parallel, conductive plates having equal amounts of opposite charges and separated by a → dielectric material. When a capacitor is fully charged there is a → potential difference between its plates. The larger the area of the plates and/or the smaller the separation between them the greater will be the charge that the capacitor can hold and the greater will be its → capacitance. The actual charge Q on the plates of a capacitor is given by: Q = C . V, where C is the capacitance and V the → voltage.

From capacit-, from → capacity + → -or.

From gonjân transitive stem of gonjidan "to be contained; to hold exactly; to be filled," → capacity, + -gar, → -or.