Carbon-composition Resistor is a non-inductive resistor made from a mixture of finely powdered carbon with a non-conductive substance, usually phenolic. The resulting clay-like material is pressed into a cylindrical shape, and wire leads are inserted in the ends. The resistance depends on the ratio of carbon to the non-conducting material, and on the physical distance between the wire leads. This type of resistor is useful from direct current to ultra-high radio frequencies.
Compare, FILM RESISTOR, WIREWOUND RESISTOR
See also, Variable Resistor, Dropping Resistor, Grid Resistor, Current-limiting Resistor