a) Power and efficiency
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Last updated 8:11 PM on 2/12/26
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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 of an object (W) = energy transferred by the object (J) / time (s)
P = Fv
power delivered to an object (W) = force applied on the object (N) × velocity of the object (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 (J) / total input energy (J) ) × 100
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