A fridge's compressor motor consumes electrical energy at a rate of 500W when running. If it runs for 35% of each day, and a kWh costs about .10$, how much does it cost to run the fridge for a month?

Answer 1

35% of a day is 0.35(24) = 8.4 hours and 500 W is equal to 0.500 kW.

So the energy consumed is (0.500)(8.4) = 4.2 kWh per day. At $0.10 that would cost (4.2)(0.1) = $0.42 per day.

If you assume 30 days are in a month, the cost per month would be ($0.42)(30) = $12.60 per month