1Electromagnetic Induction
Occurs when an emf is induced in a coil due to a changing magnetic flux
2Magnetic Flux
Formula
Φ = BA
(LOG TABLES)
3The Weber
If the magnetic flux density over an area of 1 m² is 1 tesla then the flux through the area is 1 weber.
4Faraday's Law of Electromagnetic Induction
states that the size of the induced emf is directly proportional to the rate of change of flux.
5E = – (dΦ ÷ dt)
E = – N (dΦ ÷ dt)
where N = number of turns
6Lenz's law of Electromagnetic Induction
the direction of the induced emf opposes the change causing it.
7Electrical Generator
A device that converts mechanical energy to electrical energy
8Mutual Induction
Occurs in two adjacent coils when the magnetic field in one coil changes and an emf is induced in the other
9Self Induction
A changing magnetic field in a coil induces an emf in the coil itself
10Transformer
A device which changes the value of an alternating current