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JAMB Physics 2006 Question 25

Question 25

Electrical Energy and Power

An electric heater with a p.d. of 240 V connected across its terminals has a total resistance of 960 Ω. Find the power rating of the heater.

  1. A.4.00 W.
  2. B.0.25 W.
  3. C.60.00 W.
  4. D.38.40 W.
Show the answer and explanation

Answer: C (60.00 W.)

Explanation

P = V2/R = 2402 ÷ 960 = 57 600 ÷ 960 = 60 W.