A lamp marked 100W 250V is lit for 10 hours If ... - WAEC Physics 1994 Question
A lamp marked 100W, 250V is lit for 10 hours. If it operates normally and 1KWh of electrical energy costs 2k, what is the cost of lighting the lamp?
A
1k
B
2k
C
5k
D
10k
correct option: b
100W X 10h = 1000Wh = 1KWh thus cost is 2k
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