Wondering if a machine could be said to be 100% efficient

  1. I was just wondering if a machine could be said to be 100% efficient if for example it gave out heat, light and sound but all I these types of energy are wanted and not wasted?
    Thanks for the replies
     
  2. jcsd
  3. mfb

    Staff: Mentor

    If you want every output: Sure. Electric heating is basically 100% efficient, for example.
    Add tiny amounts of gravitational waves, if there are moving parts ;).
     
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