Transcript Electromagnetic Induction & Alternating Current

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