A working electric motor takes a current of 1 5... - JAMB Physics 2001 Question
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 option: a
Efficiency = power output/power Input
=> 80/100 = power output/1.5 * 250
i.e power output = 1.5*250 *80/100 =300w
=> 80/100 = power output/1.5 * 250
i.e power output = 1.5*250 *80/100 =300w
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