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Electromagnetic Faraday
Electromagnetic Faraday
8
Physics
11th Grade
11/14/2008

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Term
Faraday's Induced emf
Definition
a changing magnetic field from a changing current induces an emf
Term
Magnetic Flux, ΦB (4)
Definition

the induced emf in a wire loop is proportional to the rate of change of magnetic flux through the loop

ΦB = B┴A=BAcosθ

Weber, 1 Wb=1 T·m2

proportional to total number of lines passing through  the loop 

 

Term
Faraday's law of induction (2)
Definition

&=-N ΔΦB/Δt = Blv

a changing magnetic flux, ΔΦB induces and electric field

Term
Lenz's Law (2)
Definition

a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux

used to determing direction of conventional electric current induced in a loop due to a change in ΦB

Term
Electric generator
Definition
opposite of a motor; transforms mechanical energy into electrical energy
Term
Transformer (3)
Definition

consists of 2 coils either interwoven or linked by an iron core; a changing emf in one induces an emf in the other

voltage ≈ turns (N) ≈ 1/current

Vsec/Vpri=Nsec/Npri=Ipri/Isec

only work if the current is changing (AC) 

Term
Lorentz's Force Law (electron & magnetic)
Definition

Felectron = evB

FB = qv x B

e=electron charge=1.6x10-19C

Term
Induced EMF
Definition
when a conductor moves through a uniform magnetic field
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