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JAMB Physics 2009 Question 41

Question 41

Electrical Energy and Power

An electric lamp marked 240V, 60W is left to operate for an hour. How much energy is generated by the filament?

  1. A.3.86 × 105 J
  2. B.3.56 × 105 J
  3. C.1.80 × 104 J
  4. D.2.16 × 105 J
Show the answer and explanation

Answer: D (2.16 × 105 J)

Explanation

Energy = power × time = 60 × 3600 = 216 000 J = 2.16 × 105 J.