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help with Energy Question?
An energy-star refrigerator rated at 950 watt is $100 more expensive than a standard one rated at 1050 watt If energy cost is $0.01 per kilowatt-hour, how long does it take for the energy-star refrigerator to start saving money for you?
The difference in power is 1.05kW - 0.95kW = 0.100kW
So the energy difference is 0.100kW*t (in hours)
The cost is $0.01*0.100kW*t = $100
so t = 100/(0.01*0.10) = 10^5 hr