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Power

The power supplied by the cell is equal to Iε.Power is wasted as heat due to internal resistance.

Iε = I2R + I2r

Maximum power is delivered to the load whenload resistance = internal resistance of the source.The load is said to be matched to the source.

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Specification: AQA Physics (7407), AS-level, 3.5.1.6 Electromotive force and internal resistance and 3.5.1.4 Circuits. Topic: Direct Current Circuits.

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