The core of a transformer is laminated to reduce energy loss caused by eddy currents. Eddy currents are small circulating currents induced in the iron core due to the changing magnetic field created by the alternating current in the coils. These currents generate heat and waste energy, decreasing the transformer's efficiency. Laminating the core involves stacking thin sheets of electrical steel, each insulated from the others by a thin coating. This construction increases the electrical resistance along the paths of eddy currents, forcing them to flow in smaller loops within each lamination rather than larger loops across a solid core. As a result, the total eddy current and associated heat losses are greatly reduced. Additionally, laminations help prevent excess heating, improve transformer efficiency, and reduce energy waste during operation. The insulation between the sheets also prevents short circuits between laminations, further enhancing performance. In summary, the transformer core is laminated to minimize eddy current losses by increasing resistance and breaking up the paths of these currents, thus improving the overall efficiency of the transformer.