SSE JE Electrical Engineering 29 Oct 2020 Shift 2 Papers

Question : 176 of 200

Marks: +1, -0

A electric motor operating from 220 V supply takes a current of 8 A. The motor has an efficiency of 80%. Determine the output of the motor.

Solution:

Given that, input voltage

( \V )=220 \V

Line current

( \I _{ \L })=8 \A

Input power

= \V ×\I _{ \L }=220 ×8=1760 \W

Efficiency

(\η)=80 \%=0.8

Output power

=\η×

input power

=1760 ×0.8=1408 \W

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