Transformers are essential electrical devices used to transfer energy between circuits by stepping up or stepping down voltage levels. This article explores various types of transformers, including power transformers for high-voltage transmission, distribution transformers for local delivery, 3-phase transformers for industrial applications, and furnace transformers for heavy-duty metallurgical operations. Power Transformers. Understanding these types highlights their critical role in ensuring efficient, reliable, and safe power supply across residential, commercial, and industrial sectors.