What is the cost of running five 50W lamps and ... - JAMB Physics 2020 Question
What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 Kobo per KWh?
A
N0.65
B
N0.39
C
N3.90
D
N0.13
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Correct Option: D
P = (5 x 50) + (100 x 4)
= 650watts
Energy(kWhr) = 650 x 10-3 x 10
= 6.5 kWhr
1kWhr cost 2 kobo ; 6.5 kWhr will cost 2×6.512×6.51
= 13 kobo
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