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Energy Cost Calculation for Electrical Appliances

Learn how to calculate the cost of running electrical appliances based on power ratings, energy usage, and cost per kilowatt-hour. Step-by-step guide included.

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Energy Cost Calculation for Electrical Appliances

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  1. Calculating Cost to Run Electrical Appliances • First, find the UL tag on the appliance. • If power rating is given, move on to next step. If not, you must calculate the electrical power of the appliance. • POWER = CURRENT X VOLTAGE P = IV (w) = (a)(V) Remember: Power is the rate at which work is done. A 100w light bulb converts electricity into light faster than a 60w light bulb. Therefore, it gives off more light!

  2. Calculating Cost… con’t • Calculate the amount of electrical energy the appliance uses in a given period of time. • E = Pt (kWh) = (kW)(h) E = electrical energy P = electrical power T = time

  3. Calculating Cost… con’t • Use the cost per kilowatt hour, to determine the cost to use the electrical appliance. Simply multiply cost per kWh by the number of kWh used by the appliance. • In Frederick, the cost is about 9 cents per kilowatt hour.

  4. Sample Problem • How much does it cost to run the digital clock in my room for 24 hours? • The UL tag reads 8w (0.008kW) E = Pt E = 0.008kW x 24h E = 0.192kWh • 0.192kWh x 9cents / kWh = 1.728 cents

  5. Sample Problem • What does it cost to make a batch of french fries in my deep fat fryer if they must cook for 7 minutes? • The UL tag reads: 12.5a, 120V • First, I must calculate its power rating. P = IV P = 12.5a x 120V I = 12.5a V = 120V P = 1500w

  6. Next, Use the Power to calculate the Electrical Energy used. E = Pt P = 1500W = 1.5kW T = 7min = 0.12h E = 1.5kW x 0.12h E = 0.18kWh Finally, use the electrical energy to calculate the cost. 0.18kWh x 9c / kWh 1.62 cents to make a batch of fries.

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