What Uses Watts in Your Home

Electricity usage is calculated in kilowatt-hours. A kilowatt-hour is 1,000 watts used for one hour. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour.

How to calculate electric usage cost:

1. Volts x Amps = Watts
2. Watts ÷ 1,000 = Kilowatts (kW)
3. Kilowatts (kW) x Hours of Use = Kilowatt Hours (kWh)
4. Kilowatt Hours (kWh) x .08355 (rate) = Cost of Usage
5. Add TVA Power Cost Adjustment charge per kWh

Appliance/Equipment	Avg. Usage	Monthly kWh	Cost/Month
Comfort & Health
Air Conditioner - Window 12,000 BTU (1,400 Watts)	8 hours/day	341	$27.35
Electric Blanket (177 Watts)	8 hours/night	43	$3.45
Dehumidifier (257 Watts)	12 hours/day	94	$7.54
Fan - Furnace (300 Watts)	7 hours/day	64	$5.13
Fan - Window (200 Watts)	2 hours/day	12	$.96
Fan - Ceiling (125 Watts)	12 hours/day	46	$3.69
Fan - Attic (1000 Watts)	2 hours/day	61	$4.89
Heat Pump (Average Rating) (1,800 sq. ft. house) 7.7 HSPF*	daily	Average Annual Cost	$889.16
Heat Pump (High Efficiency) (1,800 Sq. ft. house) 8.5 HSPF*	daily	Average Annual Cost	$813.18
Heat Pump (Geothermal) (1,800 sq. ft. house) Equiv. 13.3 HSPF*	daily	Average Annual Cost	$551.02
Heater - Portable (1500 W)	8 hours/day	365	$29.28
Humidifier (177 Watts)	8 hours/day	43	$3.45
Water Heater (4500 W)	3 hours/day	411	$32.97
Waterbed (375 Watts)	9 hours/day	103	$8.26
Hair Dryer (1,000 W)	15 min./day	7.6	$0.61
*Heating Season Performance Factor (an efficiency rating) **Based on 4,296 Heating Degree Days. Cooling costs would be approximately 40% of total energy costs.
Food Prep. & Preservation
Blender/Food Processor (400 Watts)	1 hour/week	2	$0.16
Coffee Maker (894 Watts)	one hour/day	27	$2.17
Dishwasher (1,200 Watts) (excludes hot water costs)	one hour/day	37	$2.97
Microwave Oven (1,450 W)	30 min./day	22	$1.76
Range (12,200 Watts)	30 mins./day	186	$14.92
Self Cleaning Cycle	twice/month	12	$.96
Freezer 15 Cu. Ft. (341 W.)	12 hrs/day	124	$9.95
Refrigerator - 14 Cu. Ft. (440 W.)	12 hrs/day	161	$12.91
Refrigerator - 18 Cu. Ft. (manual defrost - deduct 35%)	12 hrs/day	180	$14.44
Laundry
Clothes Dryer (4,900 W)	6 loads/week	90	$7.22
Washer (512 Watts) (Excludes water costs)	6 loads/week	9	$0.72
Iron (1,008 Watts)	2 hours/week	8	$0.64
Home Entertainment/Recreation
Color TV (200 Watts) (instant-on tvs use some electricity continuously)	8 hours/day	49	$3.93
VCR (125 Watts)	4 hours/day	15	$1.20
Home Computer (500 W) Including Monitor	4 hours/day	61	$4.89
Hot Tub (5,000 W)	2 hrs/day	304	$24.38
Pool Heater (incl. motor)	avg/daily	670	$53.74
Pool Pump (1 hp)	continuous	1240	$99.46
Lighting
40-Watt Bulb (40 W) Equivalent compact fluorescent	4 hours/day 4 hours/day	5 1.375	$0.40 $0.11
60-Watt Bulb (60 W) E quivalent compact fluorescent	4 hours/day 4 hours/day	7 1.625	$0.56 $0.13
75-Watt Bulb (75 W) Equivalent compact fluorescent	4 hours/day 4 hours/day	9 2.5	$0.72 $0.20
100-Watt Bulb (100 W) E quivalent compact fluorescent	4 hours/day 4 hours/day	12 3.25	$0.96 $0.26
Farm
Electric Fence Charger	daily	2	$0.16
Heater (tractor engine block) (600W)	10 hrs/day	182	$14.60
Heater (livestock tank)	8 hrs/daily	365	$29.28
Auto Battery Charger (600W)	2 hours	36	$2.89
Well Pump (750-1000W)	avg./10% usage	40	$3.21

For other tips on saving energy visit the Department of Energy Web site,
Energy Savers - Tips on Saving Energy and Money at Home