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It is clear from the name "carbon film resistor" itself that this type of resistor is made of the carbon film. The carbon film is deposited on the ceramic precursor. This is actually a fixed type of resistor, which means that it only provides a resistance value. The function of the carbon film is to limit the current flow in the circuit. We can define carbon film resistors as Carbon film resistor is fixed resistor. It uses a carbon film deposited on a ceramic precursor to limit the flow of current.