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JAMB Physics 2001 Question 27

Question 27

Electrical Energy and Power

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

  1. A.300.0 W
  2. B.469.0 W
  3. C.133.0 W
  4. D.4.8 W
Show the answer and explanation

Answer: A (300.0 W)

Explanation

Power input = IV = 1.5 × 250 = 375 W. Output = 80% of 375 = 300.0 W.