Question

explain the diagram of dc generator?

Answer 1

An electrical Generator is a machine which converts mechanical energy (or power) into electrical energy (or power).

Principle :
  It is based on the principle of production of dynamically (or motionally) induced e.m.f (Electromotive Force). Whenever a conductor cuts magnetic flux, dynamically induced e.m.f. is produced in it according to Faraday's Law Electromagnetic Induction.
Working :
If two half slip rings are connected to ends of the coil the AC generator works as DC generator to produce DC current.When the coil is in the vertical position the induced current generated during the first half rotation rises from zero to maxi¬mum and then falls to zero again.As the coil moves further from this position, the ends of the coil go to other slip rings.Hence during the second half rotation the current is reversed in the coil itself, the current generated in the second half rotation of the coil is identical with that during the first half of direct current.

Answer 2

If we replace the silp rings of an A.C generateor by a commutator then it will becomea D.C generator .