a) Power and efficiency

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4 Terms

1
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  • define power

  • the rate of work done

2
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  • state the two formula’s for power

  • P = W/t

    • power (W) = energy transferred (J) / time (s)

    P = Fv

    • power (W) = force (N) × velocity (ms-1)

3
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  • define efficiency

  • the percentage of the input energy that is transferred to a useful energy store

4
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  • state the formula for efficiency

  • efficiency = (useful output energy / total input energy) × 100