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Electrical Applications 2 by David W. Tyler

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64 Transformers
Finally the voltage E
s
induced in the secondary winding is used to
supply the load.
EMF EQUATION
Let the maximum value of core flux be 0
m
webers and the frequency
/hertz.
τ 1
The time taken for the flux to change from + φ
ΐΏ
to - O
m
is or
seconds. *
do
Since e = N—r- volts
at
the average
e.m.f.
induced in the primary winding
= N
p
x 2
<D
m
-=-
=
Ρ
Φ„/volts.
Where N
p
= number of turns on the primary winding.
For a sine wave, the r.m.s. value is 1.11 times the average value