Energy Efficiency
Reducing energy consumption while maintaining or improving energy services through technological and behavioral improvements.
Formula
Energy Efficiency (%) = (Useful Energy Output ÷ Total Energy Input) × 100
Real World
The EU's mandatory energy labelling scheme pushed washing machine efficiency from D-rated models in the 1990s to today's A-rated machines, cutting household electricity use for laundry by around 40%.
Exam Focus
When asked to 'suggest' improvements, give a named technology (e.g. LED lighting, heat pumps) and quantify the efficiency gain where possible.
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