A working electric motor takes a current of 1.5 A 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 * 250
i.e power output = 1.5*250 *80/100 =300w