Power transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction. They are essential in the transmission and distribution of electricity, allowing for the efficient transfer of high voltage electricity over long distances. By stepping up or stepping down voltage levels, power transformers help maintain the stability and reliability of electrical systems. These transformers are typically found in substations and are designed to handle large amounts of power. They consist of primary and secondary windings, which are wrapped around a core made of magnetic material. The design and operation of power transformers are crucial for the functioning of the electrical grid, ensuring that electricity reaches homes and businesses safely and efficiently.