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    A transformer is defined as a passive electrical device that 

transfers electrical energy from one circuit to another through the 

process of electromagnetic induction. It is most commonly used to 

increase (‘step up’) or decrease (‘step down’) voltage levels 

between circuits.

[b]Working Principle of Transformer[/b]

The working principle of a 

[url=https://www.goodtransformer.com/power-transformer/]Power 

Transformer[/url] is very simple. Mutual induction between two or 

more windings (also known as coils) allows for electrical energy to 

be transferred between circuits. This principle is explained in 

further detail below.

[b]Transformer Theory[/b]

Say you have one winding (also known as a coil) which is supplied by 

an alternating electrical source. The alternating current through the 

winding produces a continually changing and alternating flux that 

surrounds the winding.

If another winding is brought close to this winding, some portion of 

this alternating flux will link with the second winding. As this flux 

is continually changing in its amplitude and direction, there must be 

a changing flux linkage in the second winding or coil.

According to Faraday’s law of electromagnetic induction, there will 

be an EMF induced in the second winding. If the circuit of this 

secondary winding is closed, then a current will flow through it. 

This is the basic working principle of a 

[url=https://www.goodtransformer.com/distribution-transformer/]

Distribution Transformer[/url].