Question

An electric refrigerator rated 400W operates 4 hours day . what is the cost of energy to operate it for the 30 days at 5 rupees per kWh

Answer 1

P = 400W
T = 4Hr

E = P * T

400*4 = 1600Wh = 1.6kWh

Energy usage for 30 days

1.6 * 30 = 48kWh

Cost of 1kWh is 5 Rs

So cost of 48kWh is 48 * 5

= 240 Rs


Thanks