DATE: _____________ CLASS: ______________
HOME ENERGY AUDIT: MEASUREMENT WORKSHEET
Created for the NTEP II program on behalf
of the National Renewable Energy Laboratory in Golden, Colorado.
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
- 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.
- 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
- 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?