An electrical machine is the apparatus that converts energy in three categories: generators which convert mechanical energy to electrical energy, motors which convert electrical energy to mechanical energy, and transformers which changes the voltage level of an alternating current.

Motors are classified into two types

AC Motor and DC Motor

Generators are classified into two types, 

AC generators and DC generators.

Transformers are classified into two types

Step up transformer and Step down transformer

Extra Topics

Synchronous Generator

Single Phase Induction Motor

Three Phase Induction Motor