Physics 0625 · IGCSE · Energy, work and power

Energy, work and power — practice question

An electric motor receives $1000\,\text{J}$ of electrical energy. It delivers $450\,\text{J}$ of useful output energy. What is the efficiency of the motor?

  • A4.5%
  • B5.5%
  • C45%
  • D55%

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