A dc generator is an electrical machine that takes mechanical energy and converts it into electrical energy. A generator does not produce electrical energy by magic, it simply converts mechanical energy into electrical energy. This mechanical energy rotates the armature of a generator and thus electrical energy is produced in the armature conductor. For producing electricity from a generator, the following three requirements are essential:

Also Read :- Working Principle of DC Generator

  • Conductors
  • Magnetic field, and
  • Mechanical energy


Insulated conductors are placed in the armature slots. These conductors may be copper conductors or aluminium conductors.

Magnetic Field

The magnetic field is produced by the use of either a permanent magnet or an electromagnet. However, in all generators the electromagnet is mostly used. The reason is that the magnetic field can be easily controlled. These field poles are provided on the pole shoe of the generator.

Mechanical Energy

For the rotation of the conductor, mechanical energy is obtained from the prime mover (diesel engine, steam turbine, water turbine, etc). The mechanical energy given to the generator rotates the armature conductors which cuts the magnetic lines of force, and emf is induced.