Current through primary coil induces current in secondary coil.
The transformer has a primary coil and a secondary coil.
Current is induced in the secondary coil by passing a current through the primary coil.
The induced electromotive force at the secondary coil can be got by changing the flux of the primary coil.
"A water-cooled coil (inductor), acting as the primary winding of a transformer, surrounds the material to be heated (the workpiece), which acts as the secondary winding. Alternating current flowing in the primary coil induces eddy currents in the workpiece, causing it to become heated."
