NAME: _______________________________________________ DATE: _____________ CLASS: ______________ HOME ENERGY AUDIT: MEASUREMENT WORKSHEET Created for the NTEP II program on behalf of the National Renewable Energy Laboratory in Golden, Colorado. DIRECTIONS: Answer the questions below in the space provided. Let's calculate the annual cost to run an appliance for a year.   Wattage X Hours Used Per Day X Days Used Per Year = Kilowatt-hour (kWh) consumption 1000   Multiply this number by your local utility's rate per kWh consumed (In Denver the cost is 8.9 cents/kWh) to calculate annual cost.   EXAMPLE   If John uses a window fan (200 watts) 4 hours a day for 120 days per year, how much does it cost him to run his fan per year?   200 X 4 X 120 = 96 kWh 1000   96 kWh X 8.9 Cents/kWh = \$8.16 per year     PROBLEMS TO SOLVE   After school each day, Sally uses her computer to do her homework. If she has an average of two hours of homework per night for 180 days of school per year, how many Kilowatt-hours are consumed and what is the annual cost of using her computer? A CPU and monitor use 270 Watts. PROBLEM TO SOLVE On January 1, the meter looked like this: On January 31, the meter looked like this: How many kilowatt-hours of electricity were used during January? If the cost of electricity in Denver is \$.089 per kWh, how much did electricity cost for January? What is the average cost of electricity per day during January?

 HOMEWORK:   Choose a home appliance that you use and calculate your own energy consumption.   Appliance: _________________ Wattage: __________________ Hours used Per Day: ________   READING ELECTRIC METERS EXAMPLE Monday morning the meter looked like this: Friday morning the meter looked like this: The meter reading Monday would be 40565 and on Friday it would be 41615 To figure out how much electricity was used, subtract Monday's reading from Friday's reading like this: 41,615 - 40,565 = 1,050 kilowatt-hours Based on electricity costs in Denver of \$.089 per kilowatt-hour, the total cost would be: 1,050 X \$.089 = \$93.45