Question

An electric motor with a 1200 hp output drives a machine with an efficiency of 60%. What is the energy output of the machine per second?

Answer 1

536,904 J/s

Step-by-step explanation:

The energy output from motor is the input energy in the machine.

We know that efficiency is percentage energy ouput to energy input, and expressed as

`n=\frac {E_o}{E_i}`

Where n and E represent efficiency and energy respectively, subscripts o and i represent output and input respectively. Since for the machine we have the input energy then the output will be the product of efficiency and input energy

Energy output=0.6*1200 hp=720 hp

Converting hp to J/s we multiply by 745.7

Energy is 720*745.7=536,904 J/s