What is the principle of operation of a Transformer?

A simple transformer consists of two windings placed on an iron core. When alternating voltage is applied to one winding (called the primary), it sets up to alternating flux in the core. The alternating flux links the other winding (called the secondary) and induces in it.

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Where do we require single-phase induction motors?

Single-phase induction motors are required where-

• 3-phase supply is not available
• Efficiency is of lesser importance
• Equipments is portable
• Ratting is less than 1 H.P.

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