High voltage capacitors are passive electronic components that store charge and energy for use in high voltage applications. They consist of two conducting plates separated by an insulating material called the dielectric. Film capacitors are high voltage capacitors made out of plastic. There are two basic types. Film-foil capacitors include one or more layers of a plastic film dielectric wound alternately with metal foil electrodes. Metallized film capacitors consist of a film dielectric on which the metal electrode has been vapor-deposited. The layers are wound into a convoluted roll so that the electrodes extend beyond the dielectric films. Capacitance, a measure of energy storage ability, is typically expressed as C = K A/D, where A is the area of the electrodes, D is their separation, and K is a function of the dielectric between the electrodes.
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