Transformer consists of two inductive coils which are magnetically linked through a core of low reluctance but the coils are electrically isolated.The two coils have high mutual induction. If one of the coils is connected to an alternating voltage source,an alternating current will flow through that winding and this current set up an alternating flux in the core.Most of this flux is linked with the other coil and induces mutually induced emf in the other winding. This is according to the Faraday's law of electromagnetic induction.If the second coil circuit is closed,an induced current flows through it.So electrical energy is transferred from one circuit to another by magnetically.
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