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JAMB Physics 2011 Question 35

Question 35

Electrical Energy and Power

If the charge of electricity per kWh is ₦4, what is the cost of operating an electrical appliance rated 250 V, 2 A for 6 hours?

  1. A.₦16
  2. B.₦24
  3. C.₦28
  4. D.₦12
Show the answer and explanation

Answer: D (₦12)

Explanation

Power = IV = 2 × 250 = 500 W = 0.5 kW. Energy = 0.5 × 6 = 3 kWh. Cost = 3 × ₦4 = ₦12.