Crank Ice
Crank Ice
What is the efficiency of this machine?
Martin does 72 joules of work on a hand cranked ice-cream machine.Of this energy,18 joules are lost due to friction in the crank mechanism,and the rest does useful work.What is the efficiency of this machine?
Martin does 72 joules of work on a hand cranked ice-cream machine.Of this energy,18 joules are lost due to friction in the crank mechanism,and the rest does useful work.What is the efficiency of this machine?
A 25%
B 54%
C 75%
D 80%
If the machine was 100% efficient then all 72 joules would be used for useful work.
So, since 54 joules are used for useful work the efficiency is:
(54/72)*100 = 75 % efficient.
efficiency = (output of energy)/(input of energy) and you multiply that by 100 to get the percentage.
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