electrical power the rate at which electrical energy is converted to another form of energy....
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Electrical PowerElectrical Power
The rate at which electrical energy is converted to another form of energy.
Thermal, Light, Motion…
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Electrical PowerElectrical Power
Power = current x voltageP = I x VThe units for power: watts (W)
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Electrical PowerElectrical Power
All appliances have a power rating to tell how much power it uses.
[http://www.nationalwholesaletools.com/index.asp?PageAction=VIEWPROD&ProdID=357]
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[http://courses.knox.edu/envs101/appliances.JPG]
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[http://www.thediyworld.co.uk/washer%20rating3.jpg]
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Standard Voltage in the US is 120 V:
[http://www.northpower.com.au/wrs/res2.nsf/images/appliances/$file/Appliance2.jpg]
P = 240 W
P = 2.0 A x 120 V
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Electrical EnergyElectrical Energy
The amount of power that is used over a given time.
Energy = Power x Time
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Electrical EnergyElectrical Energy
Electric companies normally use the kilowatt-hour to charge for energy.
Remember: 1 kilowatt is 1000 watts!
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MN is about 12 cents/kWh (When Taxes are Included)
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[http://www.think-energy.net/_85256A170068279F_li_meter3a__file_meter3a.jpg]
= $82.56
x $0.12 per kWh688 kWh used
May 1st
May 31st
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Electrical EnergyElectrical Energy
Example:How much does it cost to run
an XBOX 360 (160 W) for 3 hours a day for an entire month?
30 days x 3 hours = 90 hours
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Electrical EnergyElectrical Energy
Energy = 160 W x 90 h Energy = 14400 Wh or 14.4 kWh Each kWh in MN is 11 cents so… 14.4 kWh x $0.11 = $1.58 per
monthClick Here for Xcel Energy Calculators
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Average % of Energy Usage in a Home
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[http://media.popularmechanics.com/images/tb_fllightbulb_sm.jpg]
[http://www.conservastore.com/productimages/03-0034B.jpg]
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[http://www.gatech.edu/energybuzz/images/graphicBulbEfficiency.gif]