History of generators

As its name suggests, a generator generates electricity. Michael Faraday’s discovery of electromagnetic induction demonstrated a way to construct a simple generator, but there was little need for such a device until commercial technologies that used electricity, such as lights, appeared. The earliest commercial uses of electricity, such as telegraphy, arc lighting systems, and metal electroplating used batteries as their power source. This was a very expensive way of generating electricity.

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Types of Generators AC - DC

The generators are classified into  two types.

• AC generators
• DC generators

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AC Generators:

These are also called as alternators. It is the most important means of producing electrical power in many of the places since now days all the consumers are using AC. It works based on principle of the electromagnetic induction. These are of two types one is induction generator and other one is synchronous generator.

Difference between kW (kilowatt) and kVA (kilovolt-ampere) ?

The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. 
kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power).  The power factor, unless it is defined and known, is therefore an approximate value (typically 0.8), and the kVA value will always be higher than the value for kW. 

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The kilovolt-amperes (kVa) are the generator end capacity.