What is the average monthly cost of operating a 110-volt radon fan that draws 65 watts at a rate of $.08 per kilowatt-hour?

To determine the average monthly cost of operating a 110-volt radon fan that draws 65 watts, the first step is to convert the power rating from watts to kilowatts, since electricity rates are usually charged per kilowatt-hour.

Since there are 1,000 watts in a kilowatt, a fan that draws 65 watts can be converted to kilowatts as follows:

65 watts ÷ 1,000 = 0.065 kilowatts.

Next, we need to calculate the total energy consumption of the fan over a month. Assuming the fan operates continuously for 24 hours a day, the monthly energy consumption in kilowatt-hours can be calculated by multiplying the power consumption in kilowatts by the number of hours in a month:

0.065 kilowatts × 24 hours/day × 30 days/month = 46.8 kilowatt-hours per month.

Now that we have the total monthly energy consumption, we can find out the operating cost by multiplying the total kilowatt-hours by the rate of $.08 per kilowatt-hour:

46.8 kilowatt-hours × $0.08/kilowatt-hour = $3.744.

Rounding this can give us approximately $3.80.