A 5 kW appliance is used for 5 hours. At $0.014 per kWh, what is the cost of running the appliance?

A 5 kW appliance is used for 5 hours. At $0.014 per kWh, what is the cost of running the appliance?

• A. $0.50
• B. $0.35
• C. $0.70
• D. $0.21

Answer: (B)

To determine the cost of running a 5 kW appliance for 5 hours, you first need to calculate the total energy consumption in kilowatt-hours (kWh). This is done by multiplying the power rating of the appliance by the duration of use:

5 kW * 5 hours = 25 kWh.

Next, to find the total cost, you multiply the total energy consumption by the rate per kWh:

25 kWh * $0.014 per kWh = $0.35.

Thus, the cost of operating the 5 kW appliance for 5 hours at a rate of $0.014 per kWh is $0.35. This clearly demonstrates how the calculations are applied in practical contexts, reinforcing the importance of understanding units and cost per energy consumed in electrical work.