If the charge of electricity in Kwh is N4, what is the co...
If the charge of electricity in Kwh is N4, what is the cost of operating an electrical appliance rated 250 v, 2A for six hours?
N28
N12
N16
N24
Correct answer is B
Energy consumed = power x time = lvt = 2 x 250 x 6hr = 300 wh = 3 kwh but 1 kwh = N4
3 kwh = 3 x N4 = N 12
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