Physics 9702 · AS & A Level · Energy conservation

Energy conservation — practice question

A system has a useful power output of $4.0\,\text{W}$ and a wasted power of $16\,\text{W}$. Determine the efficiency of the system.

  • A$5.0\%$
  • B$20\%$
  • C$25\%$
  • D$80\%$

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