Question

what is the use of carbon brush in generator?

Answer 1

The brush in a generator is a component that collects the current from the moving parts and feeds to the stationary circuit. So naturally it needsto be a conductor. Carbon being conductive and soft enough to providegood wear point against thecommutator segments is the best choice.

hope it helps

Answer 2

the dress in a generator is a component that connects the current from moving parts and Fields to the stationary circuit .
brush is a device which conducts electron between stationary wires and moving parts most commonly in a rotating shaft