Question

working principle of transformer is

Answer 1

Working Principle of Transformer The working principle of transformer is very simple. It depends upon Faraday's law of electromagnetic induction. Mutual induction between two or more winding is responsible for transformation action in an electrical transformer. Faraday's Laws of Electromagnetic Induction According to these Faraday's laws, "Rate of change of flux linkage with respect to time is directly proportional to the induced EMF in a conductor or coil".

Answer 2

Transformers consist of types of conducting coils as primary winding and secondary windings.

The input coil is called the primary winding and the output coil is called the secondary winding of the transformer.

There is no electrical connection between the two coils; instead they are linked by an alternating magnetic field created in the soft-iron core of the transformer. The two lines in the middle of the circuit symbol represent the core. Transformers waste very little power so the power out is almost equal to the power in.

The primary coil and the secondary coil posses high mutual inductances. If one of the coils is connected to the source of alternating voltage, then an alternating flux will set up in the laminated core.

This flux gets linked up with the other coil and an electromagnetic force is induced, as per Faraday’s law of electromagnetic inductance.

e = M di/dt Where e is induced EMF M is mutual inductance

If the second coil is closed then the current in the coil is transferred from primary coil of the transformer to the secondary coil.