Discuss the types of $AC$ generator. How much power they deliver? What is the frequency of $AC$ generator?

(N/A) In commercial generators,the mechanical energy required for the rotation of the armature is provided by water falling from a height,for example,from dams. These are called hydroelectric generators.
Alternatively,water is heated to produce steam using coal or other sources. The steam at high pressure produces the rotation of the armature. These are called thermal generators.
Instead of coal,if a nuclear fuel is used,we get nuclear power generators. Modern-day generators produce electric power as high as $500 \ MW$,i.e.,one can light up $5$ million $100 \ W$ bulbs! In most generators,the coils are held stationary and it is the electromagnets which are rotated.
The frequency of rotation is $50 \ Hz$ in India. In certain countries such as the $USA$,it is $60 \ Hz$.