If the charge of electricity is Kwh is N4; what is the cost of operating an electrical appliance rated 250V; 2A for six hours?

A. N28
B. N12
C. N16
D. N24

Correct Answer:

Option B – N12

Explanation

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