Start here: An alternating PD is supplied to the primary coil, The alternating PD means the current through the primary coil is alternating, This AC sets up a magnetic field around the primary coil which is constantly changing, The iron core is easily magnetised by the field around the primary coil, The growing and collapsing magnetic field in the iron core will pass through the secondary coil, As the magnetic field cuts the wires of the secondary coil, a voltage is induced, The voltage induced in alternating since an alternating voltage is applied to the primary coil, An alternating current is the final output.

How does a transformer work?

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