Final answer:
The cost to use a computer that consumes 0.5 kW for 12.5 hours, with an electricity cost of $0.22 per kilowatt-hour, is $1.375.
Step-by-step explanation:
To calculate the cost of electricity for using a computer, we need to know the power rating of the computer in kilowatts (kW), the number of hours it is used, and the cost of electricity per kilowatt-hour ($/kWh).
In this case, the computer uses 0.5 kW for 12.5 hours. To find the total energy consumed, we multiply the power rating by the time of use:
Energy consumed (kWh) = Power (kW) × Time (hours)
Energy consumed = 0.5 kW × 12.5 hours = 6.25 kWh
To find the cost of using the computer, we multiply the total energy consumed by the cost per kWh:
Cost = Energy consumed (kWh) × Cost per kWh ($/kWh)
Cost = 6.25 kWh × $0.22/kWh = $1.375
Therefore, the cost to use the computer is $1.375.