Calculating Energy Transfers Simplified Revision Notes for GCSE AQA Physics Combined Science

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2.3.3 Calculating Energy Transfers

Transferring Energy

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Appliances transfer electrical energy to useful energy. For example, a fan transfers electrical energy to kinetic energy of the fan and an oven converts electrical energy to thermal energy to heat up your food.

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The amount of energy transferred in an appliance can be calculated using the following equation:

E=Pt

$E$ = energy in joules (J)
$P$ = power in watts (W)
$t$ = time in seconds (s)

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This equation tells us that more energy is transferred if the appliance has a higher power rating or if it is switched on for a longer time.

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