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Estimating Appliance and Home Electronic
Energy Use

If you're trying to decide
whether to invest in a more energy-efficient appliance or you'd like to determine your
electricity loads, you may want to estimate appliance energy
consumption.

Formula for Estimating Energy
Consumption

You can use this formula to
estimate an appliance's energy use:

(Wattage × Hours Used
Per Day ÷ 1000 = Daily Kilowatt-hour (kWh) consumption

(1
kilowatt (kW) = 1,000 Watts)

Multiply this by the number of
days you use the appliance during the year for the annual consumption. You can then
calculate the annual cost to run an appliance by multiplying the kWh per year by your
local utility's rate per kWh
consumed.

Wattage

You
can usually find the wattage of most appliances stamped on the bottom or back of the
appliance, or on its nameplate. The wattage listed is the maximum power drawn by the
appliance. Since many appliances have a range of settings (for example, the volume on a
radio), the actual amount of power consumed depends on the setting used at any one
time.

If the wattage is not listed on the appliance, you
can still estimate it by finding the current draw (in amperes) and multiplying that by
the voltage used by the appliance. Most appliances in the United States use 120 volts.
Larger appliances, such as clothes dryers and electric cooktops, use 240 volts. The
amperes might be stamped on the unit in place of the wattage. If not, find a clamp-on
ammeter—an electrician's tool that clamps around one of the two wires on the
appliance—to measure the current flowing through it. You can obtain this type of ammeter
in stores that sell electrical and electronic equipment. Take a reading while the device
is running.

Typical Wattages of Various
Appliances

Here are some examples of the
range of nameplate wattages for various household
appliances:

·     Aquarium = 50–1210
Watts

·     Clock radio =
10

·     Coffee maker =
900–1200

·     Clothes washer =
350–500

·     Clothes dryer =
1800–5000

·     Dishwasher = 1200–2400 (using the drying
feature greatly increases energy consumption)

·    
Dehumidifier = 785

·     Electric blanket-
Single/Double = 60 / 100

·     Fans

o  Ceiling = 65–175

o  Window
= 55–250

o  Furnace = 750

o 
Whole house = 240–750

·     Hair dryer =
1200–1875

·     Heater (portable) =
750–1500

·     Clothes iron =
1000–1800

·     Microwave oven =
750–1100

·     Personal computer

o  CPU - awake / asleep = 120 / 30 or
less

o  Monitor - awake / asleep = 150 / 30 or
less

o  Laptop = 50

·    
Radio (stereo) = 70–400

·    
Refrigerator (frost-free, 16 cubic feet) =
725

·     Televisions (color)

o  19" = 65–110

o  27" =
113

o  36" = 133

o  53"-61"
Projection = 170

o  Flat screen =
120

·     Toaster =
800–1400

·     Toaster oven =
1225

·     VCR/DVD = 17–21 /
20–25

·     Vacuum cleaner =
1000–1440

·     Water heater (40
gallon) = 4500–5500

·     Water pump
(deep well) = 250–1100

·     Water
bed (with heater, no cover) = 120–380