transformer

Transformer Key Point to Remember:-

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transformer

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Transformer

Key Point to Remember:-

A transformer is a static device comprising coupled coils (primary and secondary) wound on common magnetic core. The

arrangement transfers electric energy from one coil (primary) at a particular voltage level to the other coil (secondary) at another

voltage level via the magnetic flux carried by the core.

In a transformer, all voltages and currents are sinusoidal. The device is bilateral i.e. electric energy can be made to flow in either

direction with reversal of roles of the two coils.

Ideal transformer

(a) The core is infinitely permeable and is lossless.

(b) Both windings have no resistance and there is no leakage flux; so no voltage drop in either winding.

Two types of transformer cores are commonly employed in practice - core type and shell type. In the core type, the windings are

wound around the two legs of a rectangular magnetic core, while in shell type, the windings are wound on the central leg of a three

legged core

Transformer windings are made of solid or stranded copper or aluminum strip conductors. For electronic transformers, ‘magnetic

wire’ is normally used as conductor.

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