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Energy Stored in a Charged Capacitor

When a capacitor is charged, energy is needed to remove electrons from the positive plate and push them onto the negative plate.The energy is stored as electrical potential energy.Work done W = QV. Therefore the area under the graph of V against Q is the energy stored by the capacitor.

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Specification: AQA Physics (7408), A-level, 3.7.4.3 Energy stored by a capacitor. Topic: Capacitors.

Key terms in this lesson

fleming's right-hand rule
A rule using the right hand, held with thumb and first two fingers mutually at right angles, to give the directions of motion, field and induced current.
right-hand grip rule
A rule in which curling the fingers of the right hand in the direction of conventional current round a wire or coil, the thumb points along the resulting magnetic field.

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