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JAMB Physics 2010 Question 38

Question 38

Electrical Energy and Power

In the diagram above, a 200 W bulb is lighted by a 240 V a.c mains supply. If 1kWh is sold at ₦40, the cost of keeping the bulb lighted for a day is

Diagram for this question
  1. A.₦192.00.
  2. B.₦1.92.
  3. C.₦19.20.
  4. D.₦1 920.00.
Show the answer and explanation

Answer: A (₦192.00.)

Explanation

Energy in a day = 0.2 kW × 24 h = 4.8 kWh. Cost = 4.8 × ₦40 = ₦192.00.