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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: Edexcel Physics (9PH0), A-level, Topic 7: Electric and Magnetic Fields, statement 117. Topic: Capacitors.

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