Final answer:
A basic transformer consists of two separate conductive coils wrapped around a ferromagnetic core. The core is made of soft iron, laminated to minimize eddy currents. Any change in current in the primary coil induces a current in the secondary coil.
Step-by-step explanation:
A ferromagnetic core is encircled by two independent conductive coils in a basic transformer. Usually composed of soft iron, the core is laminated to reduce eddy currents. The magnetic field generated by the primary coil is contained within and intensified by the core, which subsequently transfers it to the secondary coil. The secondary coil experiences a current induction upon any alteration in the primary coil's current.