Carbon graphite conducts electricity. Graphite, an allotrope of carbon, has free electrons what carry charges from one place to another throughout the graphite. This process causes electricity flow.
Graphite, a nonmetal, has a planar structure with honeycomb lattice layers. Apart from being soft, opaque and black, graphite is insoluble and has high boiling and melting points. The insides of pencils, batteries, arc-lamp electrodes and lubricants such as bicycle oil are made from graphite.
Another allotrope, or different form of carbon, is diamond. Diamond does not conduct electricity and is rather hard. Diamond can be changed to graphite if it is heated without oxygen.