Why should the carbon brush for the trolley be made of graphite?
Graphite has good conductivity
Graphite conducts electricity and is self lubricant, resistant to wear. As for why, high school chemistry textbooks have ah.
What you said is the graphite electrode graphite, there may be a high pure graphite graphite conductive rate so high, strong, high density, the graphite is mostly used in motor vehicles, such as generators, and electric tools.
