4.2 electrical energy aashna jain. electrical energy it is the energy carried by moving electrons in...
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4.2 Electrical EnergyAashna Jain
Electrical energy
• It is the energy carried by moving electrons in an electric conductor.
• Electrons are forced down in a wire and the movement produces electricity.
• Electrons travel from one atom to another which makes the atoms imbalanced
Measurement
• Measured in Watts• Watts (LED- when turned on)• Watt-hours (Used for a longer time)• Kilowatts and Kilowatt-hours (Electricity bills)• Megawatts (electricity in an entire city)• Gig-watts (Large power plants)• US total electric capacity plants:1100 GW
Formula
• Energy transferred• Energy (J) = Power (W) x time (s)
• The power of a piece of electrical equipment depends on the voltage and current• Power (W) = Voltage (V) x current (A)
• Energy = Voltage x Current x Time
Uses
• Easy to transmit• Generated with AC or DC current• Lights• Air conditioners• Television• Computing• Water heating• Refrigeration
Examples
• Lightening (natural)• Too powerful to be confined in wires• Also an example of static electricity
• Dynamo, generator (Not natural)• Lamp (Light energy)• Heat in kettles, ovens etcetera (Heat energy)
Bibliography• http://ap-physics.david-s.org/electrical-energy/• http://www.ask.com/science/electric-energy-ddb91f717512643• http://shrinkthatfootprint.com/how-do-we-use-electricity• http://www.ucsusa.org/clean_energy/our-energy-choices/how-i
s-electricity-measured.html#.VQu4IUIxGHo
• http://www.wisegeek.com/what-is-electrical-energy.htm