An electric lamp is rated 240V 40W What is the ... - WAEC Physics 2005 Question
An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?
A
N7.20
B
N18.00
C
180.00
D
N720.00
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Correct Option: A
Cost = (\frac{Pt}{1000}) x cost per kWh
= (\frac{40 \times 72}{1000} \times 2.50 = N7.20)
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