Ceramic Resistor Construction

Metal film resistors are produced by depositing a resistive element on a high grade ceramic rod.

Ceramic resistor construction. The majority of the power wirewound resistors have a ceramic core and a ceramic coating to protect the winding. The construction of a carbon film resistor can be done by placing the carbon layer on a substrate of a ceramic. Tcr varies from 75 till 200 ppm c. The resistor is made by taking an alumina or ceramic substrate.

The ceramic coating combines a high insulation and physical protection with good heat dissipation. It is a nickname for the heat resistant ceramic case in which a coil of resistance wire is potted. Wirewound resistors are very variable in construction and physical appearance. Terminals are attached and the insulation coating is applied to the outside.

They are most often wire wound resistors. The construction of a resistor is shown in the below diagram. Composition resistors are produced using a mixture of a finely ground insulator and conductor. Then a thin film of resistive material is deposited this is typically metal oxide or a metal film again the resistor is fired.

The construction of ceramic composition resistors concentrates nearly all of the component mass into the resistive element resulting in a rugged device with high energy capacity. The carbon film is a resistive material toward the flow of current in this resistor. However even this description is out of date. Typical resistance values are in the range from 1ω til 10 kω.

Their resistive elements are commonly lengths of wire usually an alloy such as nichrome nickel chromium or manganin copper nickel manganese wrapped around a ceramic or glass fibre rod or tube and coated in an insulating flameproof cement film. This resistor consists of two terminals like a normal resistor. The resistance is controlled based on the ratio of the insulator and conductor mixture.