1. Electromagnetic Induction & Alternating Current
Resources:
Grob: Basic Electronics Textbook: Chapters 15&16

2. Michael Faraday
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

3. Faraday’s Experiments
Show two of Faraday’s experiments

4. Left-Hand: 3 Finger Rule
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.

6. Alternating Current

7. How it works!

8. Alternating Current cont.

9. 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)

10. Sine Wave

11. Volts/Div= ______________ Sec / Div = ______________
Period (Time) = __________ Frequency= ____________
Peak V = ________ P-P Voltage = _________ RMS V= _________