How are carbon film resistors prepared?

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(A) Carbon film resistors are prepared by depositing a thin layer of carbon on a ceramic rod through a process called thermal decomposition of hydroca

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By depositing a thin layer of carbon on a ceramic rod.

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(A) Carbon film resistors are prepared by depositing a thin layer of carbon on a ceramic rod through a process called thermal decomposition of hydrocarbon vapors. $1$. $A$ ceramic rod is placed in a vacuum chamber. $2$. Hydrocarbon gas is introduced into the chamber at high temperatures. $3$. The hydrocarbon decomposes,leaving a thin,uniform film of carbon on the surface of the ceramic rod. $4$. The resistance value is then adjusted by cutting a helical groove into the carbon film.

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