Electrical Power
description
Transcript of Electrical Power
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.
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Standard Voltage in the US is 120 V:
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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)
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= $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
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