What is the primary reason why the core of a transformer is laminated with thin sheets of insulated iron rather than using a solid iron block?

💡 Solution & Explanation

Transformers use laminated iron cores to minimize power losses due to eddy currents, which are induced circulating currents generated in a solid metal core by changing magnetic flux. Lamination breaks the path of these currents, increasing electrical resistance and drastically reducing Joule heating losses. Copper losses occur in windings rather than the core, and magnetic flux leakage is minimized through tight core design.