Transformer:
In power plant, electric generator used to create an
emf.emf thus produced is of very high voltage before using it for domestic
purpose that voltage must be decreased
Thus device that used to decrease or increase voltage produced
by electric generator, is known as Transformer .
In transformer there exist primary and secondary coil that
are linked to a laminated iron core.
Reason to use laminated iron core is to reduce eddy
current ( circulating current leads to
power loss).
From electric generator, Alternating current passes through
the loops of wire of primary coil. It created changing magnetic field .in the
same way, As magnetic field produced inside a solenoid
This changing magnetic field travels through iron core to
the secondary coil ,
changing magnetic field produced changing magnetic flux in
secondary coil.
We know by faraday's law .changing magnetic flux induces a
emf .
As a result a voltage induced in secondary coil.
