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In electronics a capacitor is a device used to store an electric charge, consisting of one or more pairs of conductors separated by an insulator. There are two terminals on a capacitor for application of connection to an electrical circuit. Although similar to a battery in some respects, a capacitor uses two plates to store electricity in an electrical field. A battery uses a chemical reaction to release electrical current. Capacitance formula: q C = - VWhere:q - charges on the platesV - voltage between the plates