Electrical generators are very important appliances, especially in industrial operations, because they help to supply electrical power in the event of power outrange to avoid disruption of operations. Note that although they are referred to as 'generators,' they do not create electrical power. Instead, they convert mechanical energy obtained from an external source to electrical power. Generators
use the electromagnetic principle of induction that was discovered by Michael Faraday. Generators fall into two main groups; direct current (DC) generators, and alternating current (AC) generators. In the case of direct current generators, the generators are dynamos that have commutators that generate direct current. Common types of DC generators include homopolar generators and magnetohydrodynamic generators. Unlike the DC generators, AC generators give alternating current. A good example of a generator in this category is the induction AC motors
that run by turning rotors at a faster speed compared to the synchronous speed. Other types of AC generators include linear electric generators and variable-speed constant-frequency generators. Make sure to understand the characteristics of each when selecting the generator to buy for your facility.