A working electric motor takes a current of 1.5A when the p.d across it is 250V. If its efficiency is 80%, the power output is?

A. 300.0W
B. 469.0W
C. 133.0W
D. 4.8W

Correct Answer: Option A

Explanation
Efficiency = power output/power Input
=> 80/100 = power output/1.5 x 250
i.e power output = (1.5 x 250 x 80)/100 =300w