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Which of the following equations for the efficiency of a machine is correct?

Physics
WAEC 2008

Which of the following equations for the efficiency of a machine is correct?

  • A. Efficiency = \(\frac{\text{Velocity Ratio}}{\text{Mechanical Advantage}}\) x 100%
  • B. Efficiency = \(\frac{input}{output}\) x 100%
  • C. Efficiency = \(\frac{\text{load distance}}{\text{effort distance}}\) x 100%
  • D. Efficiency = \(\frac{\text{Mechanical Advantage}}{\text{Velocity Ratio}}\) x 100%
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Correct Answer: Option D
Explanation

EFFICIENCY is the ratio of useful work done by the machine to the total work put into the machine.

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