Physics · Work, energy and power

PhysicsWork, energy and powerJAMB

A machine does 4,000 J of useful work when 5,000 J of energy is supplied. Its efficiency is

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Answer: A. 80%

4,000/5,000 × 100 = 80%.

An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.

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