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UNIT 12: TRANSFORMERS AND INDUCTIVE COMPONENTS INTRODUCTION A transformer transfers electrical energy between two coils using magnetic fields. It can step voltage up or down and provides isolation. Inductive components also include common‑mode chokes and coupled inductors. STORY 1: How a Transformer Works A transformer has two coils: primary and secondary, wound on a common magnetic core. When AC flows in the primary, it creates a changing magnetic field. This induces a voltage in the secondary