Question

Please Give Right Answer Thank You.
an electric refrigerator rated 400 w operates 8 hours per day .what is the cost of the energy to operate it for 30 days at the rate of ₹3 per kilowatt hour?

Answer 1

Here, we have
Power of the electric refrigerator, P = 400 W = 4001000 kW = 0.4 kWTime for which the refrigerator op
erates, t = 30 × 8 h = 240 h
∴ Energy consumed = P x t
= 0.4 kW x 240 h
= 96 kWh
Cost of the energy to operate refrigerator at a rate of Rs 3.00 per kWh = 96 x 3.00 = Rs 288.00.