# Electrical Power The rate at which electrical energy is converted to another form of energy. Thermal, Light, Motion…

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Electrical Power The rate at which electrical energy is converted to another form of energy. Thermal, Light, Motion…

Electrical Power Power = current x voltage P = I x V The units for power: watts (W)

Electrical Power All appliances have a power rating to tell how much power it uses. [http://www.nationalwholesaletools.com/index.asp?PageAction=VIEWPROD&ProdID=357]

[http://courses.knox.edu/envs101/appliances.JPG]

[http://www.thediyworld.co.uk/washer%20rating3.jpg]

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

Electrical Energy The amount of power that is used over a given time. Energy = Power x Time

Electrical Energy Electric companies normally use the kilowatt-hour to charge for energy. Remember: 1 kilowatt is 1000 watts!

MN is about 12 cents/kWh (When Taxes are Included)

[http://www.think-energy.net/_85256A170068279F_li_meter3a__file_meter3a.jpg] = \$82.56 x \$0.12 per kWh 688 kWh used May 1st May 31st

Electrical 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

Electrical 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 month Click Here for Xcel Energy Calculators

Average % of Energy Usage in a Home

[http://media.popularmechanics.com/images/tb_fllightbulb_sm.jpg] [http://www.conservastore.com/productimages/03-0034B.jpg]

[http://www.gatech.edu/energybuzz/images/graphicBulbEfficiency.gif]

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