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

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Presentation on theme: "Electrical Power The rate at which electrical energy is converted to another form of energy. Thermal, Light, Motion…"— Presentation transcript:

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

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

3 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]

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

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

6 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

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

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

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

10 [http://www.think-energy.net/_85256A F_li_meter3a__file_meter3a.jpg] = $82.56 x $0.12 per kWh 688 kWh used May 1st May 31st

11 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

12 Electrical Energy Energy = 160 W x 90 h Energy = 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

13 Average % of Energy Usage in a Home

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

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


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