Question

A motor takes 2,280 Joules of electrical energy and turns it into 1,606 Joules

of useful kinetic energy and 550 Joules of wasted thermal energy and sound.
Calculate the efficiency of the motor in percent.

Answer 1

70.4%

Step-by-step explanation:

Step one:

given data

input energy= 2280J

output energy= 1,606 Joules of useful kinetic and 55joules waste

hence the useful out put= 1606J

Required

The efficiency of the motor

Step two:

what is the efficiency of a motor?

efficiency is the ratio of mechanical power delivered by the motor (output) to the electrical power supplied to the motor (input)

Efficiency= 1606/2280*100

Efficiency=0.704*100

Efficiency=70.4%