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Paying for Electricity

Paying for Electricity. Measuring Electrical Energy. The electrical energy that you use at home is measured in kilowatt hours ( kW  h ).

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Paying for Electricity

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  1. Paying for Electricity

  2. Measuring Electrical Energy • The electrical energy that you use at home is measured in kilowatt hours (kWh) The images above all represent 1 kWh of energy use. (A) A 100 W bulb on for 10 hours (B) Ironing for 1 hour (C) Jogging for 1 hour (D) Having a hot shower for 3 minutes

  3. Electric Meters • Electric meters, such as the one shown below, continuously measure the amount of electrical energy that is used in a building

  4. Smart Meters and Time-of-Use Prices • Modern electrical meters, called smart meters, allow power companies to charge different prices for electricity, depending on the time of day it is used • Smart meters measure the amount of energy that is used every hour

  5. Time-of-Use Pricing

  6. The Cost of Electricity • Just as you pay so much money per kilogram, when you buy fruits and vegetables, you pay a certain amount of cents per kilowatt-hour when you use electricity • Formula: Cost = Energy (kWh) X price

  7. Sample Problem #1 Calculate the cost of the electricity needed to operate a refrigerator for one month, if it uses 75 kWh of energy. The price of electricity is $0.089 / kWh. G: E = 75 kWh price = $ 0.089/kWh R: Cost A: Cost = E X price S: cost = 75 kWhX $ 0.089/kWh cost = $ 6.68 P: It costs $ 6.68 to operate a refrigerator for one month

  8. Sample Problem #2 You run your 1200 W dishwasher every night before you go to sleep for 30 min each time. Calculate the total weekly cost if your price is $0.07 per kWh. G: P = 1200 W = 1.2 kW t = 0.5 h (30 min) X 7 = 3.5 h price = $ 0.07/kWh R: Cost Find E first A: E = P X t Cost = E X price S: E = 1.2 kW X 3.5 h E = 4.2 kWh Cost = 4.2 kWh X $0.07 / kWh Cost = $0.29 P: It costs 29 cents to run the dishwasher for one week.

  9. Homework • “The Price of Energy” handout

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