Electrical Power The rate at which electrical energy is converted to another form of energy....
-
Upload
tatiana-bladen -
Category
Documents
-
view
220 -
download
0
Transcript of Electrical Power The rate at which electrical energy is converted to another form of energy....
Electrical PowerElectrical Power
The rate at which electrical energy is converted to another form of energy.
Thermal, Light, Motion…
Electrical PowerElectrical Power
Power = current x voltageP = I x VThe units for power: watts (W)
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]
[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 EnergyElectrical Energy
The amount of power that is used over a given time.
Energy = Power x Time
Electrical EnergyElectrical 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 kWh688 kWh used
May 1st
May 31st
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
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
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]