A 200 – W computer power supply is on 10 hours per day. If the cost of electricity is $0.15/kWh, what is the cost (to the nearest dollar) to run the computer every day for a year (365 days)?
.2 kw * 10 = 2 kw hr per day
times 365 = 730 kw hr per year
times .15 dollar/kw hr = $109.50 per year
= $110 rounded to nearest dollar
To calculate the cost to run the computer every day for a year, we need to calculate the total energy consumed by the computer and multiply it by the cost of electricity.
First, let's calculate the energy consumption per day:
Energy consumption = Power * Time
Energy consumption = 200 W * 10 hours
Energy consumption = 2000 Wh (watt-hour)
Since electricity is measured in kilowatt-hours (kWh), we need to convert watt-hours to kilowatt-hours:
Energy consumption = 2000 Wh / 1000
Energy consumption = 2 kWh
Now, let's calculate the cost per day:
Cost per day = Energy consumption * Cost per kWh
Cost per day = 2 kWh * $0.15/kWh
Cost per day = $0.30
Finally, let's calculate the cost for a year (365 days):
Cost for a year = Cost per day * Number of days
Cost for a year = $0.30 * 365
Cost for a year ≈ $109.50
Therefore, the cost to run the computer every day for a year is approximately $109 to the nearest dollar.