This video introduces and explains efficiency for A Level Physics.

The efficiency (η) of an object, device or machine is the ratio between the useful energy out and the total energy in or the ratio between the useful power out and the total power in. The efficiency equation is: efficiency = useful energy out/total energy in = useful power out/total power in.

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Lewis

This video is recommended for anyone studying A Level Physics in the following exam boards:
AQA
CIE
Edexcel
Edexcel IAL
Eduqas
IB
OCR A
OCR B
WJEC

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