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GCSE Combined Science · key term
Energy transferred in ways that do not serve the intended purpose of a device.
Used by AQA and OCR
Specification 4.8.2.5 · Paper 3, Paper 4
Energy transferred in ways that do not serve the intended purpose. It still exists, but is often spread through the surroundings.
Revise: Energy Conservation and DissipationWasted energy = 1000 − 600 = 400 J. Efficiency = 600 ÷ 1000 × 100% = 60%. Arrow shaft widths are proportional to energy.
Specification P5.2b, P5.2d, PM5.2i · Biology Paper 1, Biology Paper 2, Chemistry Paper 1, Chemistry Paper 2, Physics Paper 1, Physics Paper 2
Explain wasted energy in the wires as well as within the appliance: wires and motor windings heat up because they have resistance.
Wasted energy is transferred to less useful stores, not destroyed.
If wasted energy is given, subtract it from the total input before calculating efficiency.
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Wasted energy has not disappeared: it has been transferred to stores that are less useful for the appliance’s intended task.
Energy transferred in ways that do not fulfil the intended purpose, often by heating the surroundings or producing unwanted sound.
Energy transferred in ways that do not serve the intended purpose of a device or system. This energy is not destroyed.
