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Which of the following statements defines correctly the efficiency of a machine?

Physics
JAMB 1979

Which of the following statements defines correctly the efficiency of a machine?
  • A. the load carried by the machine divided by effort required in carrying the load
  • B. the distance moved by the load divided by the distance moved by the effort
  • C. the useful work done by the machine divided by the total work put into the machine
  • D. the movement of the load divided by the movement of the effort about the same point
  • E. the temperature at the end of the application of the machine divided by the initial temperature
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Correct Answer: Option C
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