# Unit 3: Transformers

**Objectives:** Demonstrate understanding of the theory of operation and construction of transformers. Demonstrate understanding of turns ratio, voltage, current, and power transformation in transformers. Demonstrate understanding of transformer connection diagrams, transformer ratings, phase dot notation, parallel connections of transformer windings, series aiding connections of transformer windings, and series opposing connections of transformer windings. Demonstrate understanding of copper losses, iron losses (hysteresis and eddy currents), and magnetizing current. Demonstrate understanding of transformer efficiency and voltage regulation.