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A Capacitor

OCR A-level PhysicsCapacitorsLesson 1 of 12

A capacitor is a component that stores charge. It consists of two metal or conducting plates separated by air or an insulator known as a dielectric. When a capacitor is connected to a cell or battery, one plate loses charge and becomes positive with a charge of +Q and the other gains the charge of -Q, so that the charge stored on the capacitor is Q.

Diagram

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