Last updated on Sep 21, 2026

Efficiency (AQA GCSE Physics Combined Science): Quizzes

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Efficiency

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What is efficiency?

Ratio of useful energy output to input

Which formula calculates efficiency using energy?

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

Which formula calculates efficiency using power?

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

A bulb uses $100$ J of energy and outputs $20$ J of light. What is its efficiency?

20%

A device has $80$ J input and $40$ J useful output. Calculate its efficiency.

50%

How can efficiency be increased?

By reducing waste output

Which method reduces waste output in a system?

Lubrication

How can waste output be recycled to increase efficiency?

Absorb thermal waste and use as input

Explore AQA GCSE Physics Combined Science Revision Notes by Topics

Energy Changes in a System

National & Global Energy Resources

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Energy Changes in a System

National & Global Energy Resources

Explore AQA GCSE Physics Combined Science Flashcards by Topics

Energy Changes in a System

National & Global Energy Resources

Explore AQA GCSE Physics Combined Science Exam Questions by Topics

Energy Changes in a System

National & Global Energy Resources

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