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How much will my electrical bill be? John Jones. Electricity is priced and sold by the Kilowatt-hour. (kilo-1000) If you use 1000 watts of electricity.

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Presentation on theme: "How much will my electrical bill be? John Jones. Electricity is priced and sold by the Kilowatt-hour. (kilo-1000) If you use 1000 watts of electricity."— Presentation transcript:

1 How much will my electrical bill be? John Jones

2 Electricity is priced and sold by the Kilowatt-hour. (kilo-1000) If you use 1000 watts of electricity for 1 hour, you use 1 kwh The price of a KwH of electricity is about 8 cents ($.08)

3 How does it add up? If you run ten 100 watt light bulbs for one hour: 10 * 100 – 1000 watts 1000 watts = 1 kwh 1*.08 = $.08 (8 cents)

4 How much does it cost? Assume that you have three 300 watt bulbs on the outside of your house. You turn the lights on at 9:00 p.m. and turn them off the next morning at 7. How much does it cost to run the bulbs through the night?

5 How long did the bulbs run? From 9 until 7 is 10 hours How many total watts? 3*300 = 900 watts Watthours = 10 hrs * 900 watts = 9,000 watthours 9000/1000 = 9 kwh * $.08 = $.72

6 Try this one! A 5000 watt clothes dryer will dry a load of clothes in 1 hour. How much does it cost to dry the load of clothes? 5000 watts * 1 hr. = 5000 watthours 5000 watthours/1000 = 5 kilowatthours 5 kwh *.08 = $.40 (40 cents)

7 If you can do this one, you’ve got it!! A football field has 36 bulbs rated at 500 watts. The coach turns on the lights at 5:00 p.m. and turns them off after the game at 10:00 p.m. How much does it costs to run the lights during the game?

8 36 bulbs x 500 = watts Time = 5 hours 18000*5=90000 watthours 90000/1000 = 90 kwh 900 * $.08 = $7.20


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