Question

List the essential components of an electric generator and explain the role of each component in generating an alternating emf.

Answer 1

1) magnets: the magnets used in the generator are generally permanent magnets or electromagnets to produce magnetic field passing through the coil.

2) Armature: it consists of coils of current carrying wires in which emf is produced.

3) Rotor (prime mover): A mechanism to rotate the coil in the magnetic field to change the magnetic flux. It may be a turbine run by the windmill, thermal energy etc.

4) slip rings: These provide electrical connection for transfer of current to and fro from the generator . Brushes ride on the slip rings when the rotor rotates in a magnetic field.

5) Commutator: In DC generator a commutator is used to provide a current which is always in the same direction.