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