10. A 615 W refrigerator runs 24 hrs per day.
Calculate the cost to run it for one year (365 days) at 11 cents/kWh.
To calculate the cost to run the refrigerator for one year, we need to find the total energy consumed in kilowatt-hours (kWh) and then multiply it by the cost per kWh.
First, we convert the power consumption from watts to kilowatts:
615 W = 615/1000 = 0.615 kW
Next, we find the total energy consumed in kilowatt-hours (kWh) per day:
0.615 kW * 24 hrs/day = 14.76 kWh/day
Finally, we calculate the total energy consumed in kilowatt-hours (kWh) per year:
14.76 kWh/day * 365 days/year = 5387.4 kWh/year
Now, we multiply the total energy consumed by the cost per kWh to find the cost to run the refrigerator for one year:
5387.4 kWh/year * $0.11/kWh = $592.61
Therefore, the cost to run the refrigerator for one year at 11 cents/kWh is $592.61.