Efficiency (AQA GCSE Physics Combined Science): Flashcards

Ratio of useful work done to energy supplied

As a percentage

$\frac{\text{useful energy output}}{\text{total energy input}}$

$\frac{\text{useful power output}}{\text{total power input}}$

Reducing waste output

Recycling waste output

Lubrication, thermal insulation

Absorbing thermal waste and recycling as input energy

20%