What is the use of slip rings and carbon brushes?

When it's necessary to transmit current from a spinning conductor to a stationary conductor or vice versa, a slip ring and carbon brush combination is utilised.

Fabco Universal is a carbon brush manufacturer in delhi NCR

While carbon is a soft conductor, slip rings are composed of strong metal (often brass). When the two rub against one other, the carbon wears down over time and requires regular replacement. As a result, slip ring is safeguarded. Carbon also functions as a stable lubricant.

A revolving metal portion rubbing against a stationary metal part in an attempt to transmit electricity from metal to metal can cause overheating and melting.