Work Output vs.Input

First of all what do work output and work input mean?
  • Work output- This is the work done by the machine.
  • Work input- This is the work applied to the machine.
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In an ideal universe there would be no friction or heat transfer loss. This would mean the the work output equals the work input. However, this is not possible, therefore in our universe the work output is always less than the work input. However, how much less depends on the efficiency of the machines design.