A motor that uses electrical energy at a rate of 1.5 kW is connected to a hydraulic lift that is used to lift a 1300 kg car to a height of 1.8 m in 24 s at a constant speed. Find the efficiency of the system consisting of the motor and the lift.

Question

Physics

Sophie Chapman

14 November, 11:50

A motor that uses electrical energy at a rate of 1.5 kW is connected to a hydraulic lift that is used to lift a 1300 kg car to a height of 1.8 m in 24 s at a constant speed. Find the efficiency of the system consisting of the motor and the lift.

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Jared Olsen · Answer 1

Efficiency is a measure of how much work or energy is conserved in a process. The efficiency is the energy output, divided by the energy input, and expressed as a percentage. It is calculated as:

efficiency (%) = (useful energy out : total energy in) x 100

efficiency (%) = (((1300x9.8x1.8) / 24x1000) : 1.5 kW) x 100

efficiency (%) = 63.7%

Hope this answers the question. Have a nice day.