08 electromagnetic induction & alternating current
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Transcript of 08 electromagnetic induction & alternating current
Electromagnetic Electromagnetic Induction & Induction & Alternating Alternating
CurrentCurrentResources:Resources:
Grob: Basic Electronics Textbook: Chapters 15&16Grob: Basic Electronics Textbook: Chapters 15&16
http://www.sayedsaad.com/fundmental/3_Basic%20AChttp://www.sayedsaad.com/fundmental/3_Basic%20AC%20Generation.htm%20Generation.htm
http://www.coolmagnetman.com/magindex.htmhttp://www.coolmagnetman.com/magindex.htmhttp://micro.magnet.fsu.edu/electromag/java/index.htmlhttp://micro.magnet.fsu.edu/electromag/java/index.htmlhttp://www.regentsprep.org/Regents/physics/phys03/http://www.regentsprep.org/Regents/physics/phys03/dinduction/default.htmdinduction/default.htm
Michael FaradayMichael Faraday While Orsted discovered a relationship While Orsted discovered a relationship
between magnetism and electricity, Faraday between magnetism and electricity, Faraday discovered the principle of discovered the principle of electromagnetism: that electricity can be electromagnetism: that electricity can be created using magnetism.created using magnetism.
Faraday presenting to the Royal Society
Faraday’s ExperimentsFaraday’s Experiments
http://micro.magnet.fsu.edu/http://micro.magnet.fsu.edu/electromag/java/index.htmlelectromag/java/index.html Show two of Faraday’s experimentsShow two of Faraday’s experiments
Left-Hand: 3 Finger RuleLeft-Hand: 3 Finger Rule
The direction that induced current flows The direction that induced current flows depends upon the direction the flux lines cut depends upon the direction the flux lines cut across the conductoracross the conductor
This direction can be determined by using This direction can be determined by using the 3-finger rule.the 3-finger rule. Pointing finger points fromPointing finger points from
N to S pole.N to S pole. Thumb points in the direction Thumb points in the direction
in which the conductor moves.in which the conductor moves. Middle finger indicates Middle finger indicates
the direction of electron flow.the direction of electron flow.
Alternating CurrentAlternating Current
http://micro.magnet.fsu.edu/http://micro.magnet.fsu.edu/electromag/java/index.htmlelectromag/java/index.html
How it works!How it works!
Alternating Current cont.Alternating Current cont.
AC vs DC (war of currents)AC vs DC (war of currents)Alternating CurrentAlternating Current Nikola Tesla Nikola Tesla
(Westinghouse)(Westinghouse)
Can be generated Can be generated easilyeasily
Can be sent long Can be sent long distances with little distances with little loss in powerloss in power
Does not require Does not require batteriesbatteries
Can be changed into Can be changed into DC easily when neededDC easily when needed
Few generating Few generating stationsstations
Direct CurrentDirect Current Thomas EdisonThomas Edison Can be generated Can be generated
easilyeasily Difficult to send long Difficult to send long
distancesdistances Most devices need Most devices need
DCDC Sometimes requires Sometimes requires
the need for batteriesthe need for batteries Many generating Many generating
substations substations (less than mile)(less than mile)
Sine WaveSine Wave
Volts/Div= ______________ Sec / Div = ______________
Period (Time) = __________ Frequency= ____________Peak V = ________ P-P Voltage = _________ RMS V= _________