What are the basic requirements generating EMF ?

Ø  What are the basic requirements generating EMF ?

•          Conductor

•          Magnetic Field

•          Relative Speed

How EMF is Induced ?

Ø  When ever a conductor cuts the Magnetic field an EMF is induced in it ( Faradays I^st law of Electro magnetic induction )

What are the types of Induced EMF ?

Ø  Dynamically Induced EMF

Ø  Self Induced EMF

What do you mean my the word Dynamics ?

Ø  Dynamics is related to motion

DYNAMICALLY INDUCED EMF.

Ø  Emf is induced when the flux linking a conductor changes

Ø  In dynamically induced emf , the conductor moves in a stationary magnetic field.

Ø  The emf is induced in the conductor when it is in motion

               

Ø  Magnetic flux density    =       B wb/ m ²

               The conductor is  moving with a velocity of ‘v’ m/s 

                      Conductor length : l m

Ø  If the  conductor moves through a small distance  dx in  time dt seconds

Ø  Area swept by the    conductor  =  l ×dx

Ø  Flux cut by conductor
dø = flux density × area                 swept                                                              
      = (B l dx ) wb       

Ø  According to ‘faraday’s laws ,‘emf’ induced in the conductor is given by

Ø      E = N dø / dt

       = N *B * l * dx / dt

       = B * l * dx / dt (N=1)

       = B l v  volts

Ø   If the conductor moves at an angle’θ‘ to the magnetic field

     The EMF  E = B * l * v * Sinθ

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