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Question

(a) What do you understand by the term efficiency of the machine?

(b) A machine has an efficiency of 70 %. Explain the statement as clearly as possible.


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Solution

(a)

  1. The efficiency of a machine indicates how well its input energy is converted to useful output energy or work.
  2. It is a major factor in the usefulness of a machine and is the fraction or percentage of the output divided by the input.

(b)

  1. If a machine is 70% efficient, it means that 70% of the work input to the machine is obtained as the useful work output.
  2. The remaining 30% of the work input has been lost in overcoming the friction and other factors.

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