Question

State whether true or false:

A transformer is an electrical device that works on the principle of self-induction.

• A. True
• B. False

Answer 1

The correct option is B False

The transformer works in the principle of mutual induction between primary and secondary coils which states that induced EMF in a secondary coil is directly proportional to the rate of change of flux linkage with respect to first coil.
Say we have one winding which is supplied by an alternating electrical source. The alternating current through the winding produces a continually changing flux or alternating flux that surrounds the winding. If any other winding is brought nearer to the previous one, obviously some portion of this flux will link with the second. As this flux is continually changing in its amplitude and direction, there must be a change in flux linkage in the second winding or coil. According to Faraday's law of electromagnetic induction, there must be an EMF induced in the second. If the circuit of the later winding is closed, there must be a current flowing through it. This is the simplest form of electrical power transformer and this is the most basic of working principle of transformer.