What is TRANSFORMER ?
Transformer is a STATIC electric device, which
transforms electrical energy from one electrical
circuit to another electrical circuit by means of
common magnetic field without changing frequency.
Transformer is the most efficient
electrical device made, it can raise
or lower the voltage.
How transformer works?
The transformer works on the two main basic
principle of electricity .
FARADAY’s 1st law : Whenever flux linking with the
conductor changes emf is induced in
FARADAY’s 2nd law: The magnitude of the emf induced is
directly proportional to the rate of
change of flux.
Togetherly we call is as “MUTUAL INDUCTANCE”
1. The changing current
in the primary coil, is
usually achieved by
an alternating voltage,
resulting in an alternating
3. The field from the primary coil is
intensified and concentrated (also
referred to as increasing the “flux
linkage”) through the
secondary coil by an iron core
4.The changing flux through the
secondary coil, induces a
potential difference across the
2. As the alternating current changes
magnitude and direction, a magnetic
field is produced, which changes in a
What is transformation ratio?
Hence more the no. of turns in the winding more will be the emf induced.
TYPES OF TRANSFORMER
No. of PHASES
CLASSIFICATION ON BASIS OF APPLICATION
Stepup & stepdown tranformers.
CLASSIFICATION ON BASIS OF SERVICE