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# Electrical Power

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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: P = 2.0 A x 120 V P = 240 W [http://www.northpower.com.au/wrs/res2.nsf/images/appliances/\$file/Appliance2.jpg]

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

10. 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

11. 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

12. Average % of Energy Usage in a Home

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

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