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A farmer uses 3450 J of energy on a wheel and axle to lift a 15 kg bucket of water 20 m to the top of her well. What is the efficiency of the system?

Verified Answer :

MissPhiladelphia

Efficiency is the
measure of how efficient a process is. It is used to assess the ability of a
process in avoiding waste energy, materials, money and time in doing a
desirable output. It is calculated as;


Efficiency = useful energy ouput / total energy input

Efficiency = 15(9.81)(20) / 3450 = 0.85

awc2017chs

Output= mgh = 159.820 = 2,940J


Input= 3450J (given)


Efficiency = output/input = 2,940/3450 = 0.85% efficient



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