Key term for OCR GCSE Physics B, used in Energy and matter.
The ratio of useful energy output from a system to its total energy input, often expressed as a percentage.
Efficiency appears in OCR GCSE Physics B revision content for Matter – models and explanations, especially Energy and matter and Energy and matter.
Matter – models and explanations
Energy and matter • Energy and matter
Electric circuits
Electric generators • Electric generators
Electric circuits
Rate of energy transfer • Rate of energy transfer
Sustainable energy
Electricity generation • Electricity generation
Sustainable energy
Energy usage • Energy usage
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