Some background for my question : A transformer consists of two coils of wire pl

Question

Some background for my question :

A transformer consists of two coils of wire placed close to each other (Fig. la) so that they will be "linked" by a common magnetic field. To make the linking of magnetic flux more efficient, an iron core is inserted inside the two coils (Fig. 1b). An alternating source voltage, Vp, in the primary coil (having NP turns of wire) produces a changing magnetic field (magnetic "flux") in the common core. This changing magnetic flux induces a voltage, Vs, in the secondary coil (having NS turns). Ideally the ratio of these voltages is proportional to the ratio of the number of turns in the two coils:

My question : Why is the core made of laminated iron?

Explanation / Answer

Transformer core is designed to provide a path for the magnetic field to flow around, which is necessary for induction of the voltage between the two windings.

inorder to provide high efficiency , low reluctance path is provided for the magnetic field which flows through the core. so that core is designed to prevent circulating currents within the iron core itself. these circulating currents are called eddy currents which cause heating and energy losses with in the core and decreasing the transformer efficiency.

eddy currents are loops of electric current induced with in the conductor by changing magnetic field in the conductor.

Laminations are provided to reduce the eddy currents .

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