A fridge uses 3 kWh of energy and it costs $0.15/kWh for energy. How much does it cost for one hour of usage?
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For example, for my refrigerator, the numbers are:
Refrigerator wattage = 130 Watts.
Estimated usage = 8 hours per day (33% duty cycle)
Total energy = 130W x 8h = 1040Wh = 1.04kWh/day.
Total cost = 1.04kWh/day x 365 days x $0.25/kWh = $94.90/year.
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