In a DC generator, brushes are made of

In a DC generator, brushes are made of

Right Answer is:

Carbon or graphite

SOLUTION

  • Brushes are used to collect the current due to the induced emf from the armature coils in a DC generator
  • Brushes are made up of Carbon and graphite to reduce the wear and tear of the commutator.
  • When a brush is at any particular segment, it shorts out that particular coil and draws current from the rest of the coils
  • If emf induce in that coil, the huge current will flow
  • To prevent this, brushes are positioned in such a way that the coil being short-circuited has no emf in it to prevent heat loss in the brushes and sparking at commutator segments
  • Hence brushes placed along the magnetic neutral axis
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