An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?
A
10k
B
50k
C
N1.00
D
N5.00
E
N10.00
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Electrical power = current x voltage = IV
but I = 4A and V = 250v
P = 4 x 250 = 1000W → 1KW
Electricity consumed = Power x time
= 1 x 5 = 5kwh
but 1kwh = 10k ( given )
cost of electricity consumed for 5hrs = 5 x 10 = 50k.
Source: Myschool Past Questions Archive (Record #42860)