The core material of transformers is constructed using laminated layers to reduce the effects of eddy currents. By utilizing this layered design, the transformer’s core is made up of thin, insulated sheets that are stacked together. This laminated structure helps to minimize the circulation of eddy currents within the core material. Eddy currents are induced currents that can occur in conductive materials when exposed to a changing magnetic field. By laminating the core, the individual layers act as barriers, impeding the flow of eddy currents and reducing energy losses in the form of heat. This design choice improves the efficiency and performance of the transformer.