Earth Day Theme Unit
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Name _____________________________
Date ___________________

Earth Day
Complete

1.  Christopher likes to run the air conditioner every day from 9:00 a.m. to 8:00 p.m. The air conditioner uses 1,200 watts of power. The current cost of electricity is $0.11 per kilowatt-hour. If Christopher 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 Christopher save if he uses the save energy switch?
2.  A seventy-five-watt incandescent bulb costs $1.16 and has an estimated life of 760 hours. An equivalent eighteen-watt compact fluorescent bulb costs $15.48 and has an estimated life of 7,600 hours. The current cost of electricity is $0.10 per kilowatt-hour. During a period of 7,600 hours, how much will be saved by using the fluorescent bulb?
3.  Kyle's radio uses fifty-eight-watts of power. If Kyle plays the radio from 4:40 p.m. to 7:56 p.m., how many kilowatts will the radio use?
4.  Aaron's bill from EdHelper Electricity and Company was for a total of $145.15. EdHelper Electricity and Company charges 9.8 cents per kilowatt-hour. The total bill also included non-energy related taxes and fees of $10.11. How many kilowatt-hours did Aaron purchase?

 

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