Efficiency (OCR GCSE Physics A (Gateway Science Suite)): Flashcards

Ratio of useful work done to energy supplied

As a percentage

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

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

Reducing waste output

Recycling waste output

Lubrication, thermal insulation

Absorbing thermal waste and recycling as input energy

100 joules

20 joules

20% efficient