This is an awesome
Faraday's
G) Generator Principle - Electromagnetic Induction
1831 - Michael Faraday discovered that current and voltage can be induced when a conductor (closed loop) moves within a magnetic field.
Engraving by John Cochran (1821-1865) of a portrait of Michael Faraday
© Copyright 1997,
http://www.walter-fendt.de/ph11e/
If this wire is moved up or down (perpendicular to the field), maximum current (and V) will be generated.
Moved left or right (parallel to the field), no current will be generated
Toward which point should the wire be moved to induce the maximum electric potential? (voltage)
Point 1, perpendicular to field
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movie is part of the collection: Creative Commons license: Public Domain
How to find the direction of current
Step 1: flux lines - Out of N into S Step 2: 4 fingers follow flux lines Step 3: Thumb follows movement of wire (Given) Step 4: Palm shows Push on electrons - The current direction
Ex) If the wire in the picture below is moved upward, which way will the electrons flow? Into the page OR Out of the page?
Out of Page
Down
List 3 factors that determine the amount of current generated when a magnet is moved is moved through closed coil of wire
Show Me The
Physics
(V) Induced voltage - also called EMF - Electromotive Force
B - Magnetic Field Strength l - length of conductor (in meters) v - velocity of conductor moving through the field
.
To the left or right (perpendicular to field)
Lenz’s Law - The magnetic field around induced current opposes the wire motion that produced it. Another way to demonstrate Lenz's Law
All the left hand rules only work when moving charges are negative.
What do you do when
Right Hand Rule!
Video
Enrichment
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