Question

A computer in a house uses 0.6 kilowatt for 21.4 hour. If electricity costs $0.42 per kilowatt-hour, how much does it cost to use the computer?

Answer 1

The cost to use a computer that uses 0.6 kW for 21.4 hours, with electricity costing $0.42 per kilowatt-hour, is approximately $5.39.

Step-by-step explanation:

To calculate the cost of using the computer, we need to multiply the power usage of the computer in kilowatts by the number of hours it is used, and then multiply the resulting energy consumption in kilowatt-hours (kWh) by the cost of electricity per kilowatt-hour.

First, we find the energy used by the computer:

Energy (kWh) = Power (kW) × Time (h) = 0.6 kW × 21.4 h = 12.84 kWh

Next, we calculate the total cost to use the computer:

Cost = Energy (kWh) × Cost per kWh = 12.84 kWh × $0.42/kWh = $5.3928

Therefore, the cost to use the computer is approximately $5.39.