This document discusses electrical machines including DC generators, DC motors, and transformers. DC generators produce electricity through electromagnetic induction when a coil rotates in a magnetic field. DC motors operate on the same principle but use electricity to turn a coil and shaft. Transformers work by using a changing current in one coil to induce a current in another coil to change the voltage through electromagnetic induction.

1. UNIT II
ELECTRICAL MACHINES
Construction and Working principle- DC
Generators, EMF equation, Types and
Applications. Working Principle of DC motors,
Types and Applications. Construction, Working
principle and Applications of Transformer.

2. Introduction

3. When current moves through a coiled conductor a
circular magnetic field is induced about the coil
Current and Magnetism in a Coil