Induced emf of the transformer can be determined as E1=4.44ϕfN1 E2=4.44ϕfN2 Where, E1= RMS value of primary side induced emf E2= RMS value of secondary side induced emf ϕ= flux N1= Number of turns in the primary side N2= Number of turns in the secondary side f= supply frequency ∴ RMS value of the inducted EMF/turn in a transformer is given by
E1
N1
=
E2
N2
=4.44fϕm This is called the emf equation of transformer, which shows, emf/number of turns is the same for both primary and secondary winding.