1.

12.an electric refrigerator rated 400w operates 8 hour/ day .what is the cost of the energy tooperate it for 30 days at Rs. 5 per unit?

Answer»

Given,

Power = P = 400W = 400/1000 kW = 0.4 kW

Total time for which the refrigerator operated = t = 8 hours x 30 days = 240 h

Since, Energy consumed = P x t E = 0.4 x 240 kWh = 96 kWh

Therefore, total cost required to operate the refrigerator for the month = 96 x 5 = 480 INR.



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