Difference between Alternator and Generator

 

Alternator	Generator
An Alternator is used to generate power on the small-scale requirement.	A Generator is used to generate electricity for large-scale requirements or supplies.
In Alternator, electricity is produced by spinning the magnetic field inside the windings of the copper wire.	A generator uses dynamo to convert mechanical energy to electrical energy. It works on the principle of electromagnetic induction.
Alternators use only the required amount of energy. So, they conserve more energy.	Generators use all the energy that is produced. So, they conserve less energy.
An alternator always induces an alternating current (AC).	A generator can generate either alternating (AC) or direct current (DC).
Alternators are considered very efficient.	Generators are considered less efficient.
It doesn't require polarization in the case of alternators.	Polarization is required after installation in the case of generators.
In Alternator, the magnetic field is rotating inside the stator.	In Generator, the magnetic field is stationary or fixed, and the armature winding spins.
The armature of an alternator is always stationary.	The armature of the Generator is rotating.
The Alternator receives the input supply from the stator.	The Generator receives the input supply from the rotor.
Alternators generate voltage only when needed.	Generators produce voltage at all times.
Alternators run on a high range of RPM.	Generators run on a high range of RPM.
Alternators are generally smaller in size.	Generators are generally larger and require more space to fit in.
Alternators can never charge a dead battery.	A generator can be used to charge a dead battery.
The brushes of alternators are long-lasting.	The brushes of generators are lesser long-lasting when compared to an alternator.
Alternators are mainly used in the automobile industry as a charging system for the battery.	Generators are mainly used to produce large-scale electricity.