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2. E = P x t ... rearrange to calculate power

  • P = t ÷ E
  • P = E x t
  • P = E ÷ t
  • E = P ÷ t

3. efficiency = useful power out ÷ total power in (x 100%) ... what is power measured in?

  • J
  • kg
  • W
  • N

4. E = m x c x θ ... What is c?

  • mass
  • specific heat capacity
  • temperature change
  • energy

5. E = P x t ... Time measured in?

  • days
  • seconds
  • hours
  • minutes
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