carbon film resistor
The carbon resistor is a sheet resistor in which a thin layer of carbon is deposited on ceramic solids or cavities.
The resistor material is carbon, e.g. anthracite or graphite. Carbon resistors are inexpensive, but cannot tolerate high operating temperatures and have high inherent noise. Another disadvantage is the low constancy. Carbon resistors are frequently used in electronics mainly because of their low price and high availability.
In the case of the carbon film resistor, a thin carbon film is applied spirally to the ceramic body and encased by an insulating sheath.