In a DC generator, brushes are made of _______.

Brushes in DC machine:

• 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