If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?
A
N28
B
N12
C
N16
D
N24
Verified Correct Answer: B.
Physical Principles & Numerical Solution
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
Source: Myschool Past Questions Archive (Record #14463)