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Name _____________________________
Date ___________________

Earth Day

1.  Devin's bill from EdHelper Electricity and Company was for a total of $124.87. EdHelper Electricity and Company charges 8.8 cents per kilowatt-hour. The total bill also included non-energy related taxes and fees of $8.18. How many kilowatt-hours did Devin purchase?

2.  A sixty-watt incandescent bulb costs $0.75 and has an estimated life of 760 hours. An equivalent fifteen-watt compact fluorescent bulb costs $16.20 and has an estimated life of 9,120 hours. The current cost of electricity is $0.12 per kilowatt-hour. During a period of 9,120 hours, how much will be saved by using the fluorescent bulb?

3.  Shelby likes to run the air conditioner every day from 10:00 a.m. to 9:00 p.m. The air conditioner uses 1,300 watts of power. The current cost of electricity is $0.09 per kilowatt-hour. If Shelby uses the save energy switch on the air conditioner, the air conditioner will turn off automatically for 40% of the time that it is on. During a one week period, how much would Shelby save if she uses the save energy switch?

4.  Savannah's radio uses fifty-eight-watts of power. If Savannah plays the radio from 3:46 p.m. to 6:53 p.m., how many kilowatts will the radio use?


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