Ceramic Resistor Construction

This mixture is then compressed into a cylindrical shape.

Ceramic resistor construction.

Then a thin film of resistive material is deposited this is typically metal oxide or a metal film again the resistor is fired. 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. They are most often wire wound resistors.

Tcr varies from 75 till 200 ppm c. Composition resistors are produced using a mixture of a finely ground insulator and conductor. This resistor consists of two terminals like a normal resistor. Wirewound resistors are very variable in construction and physical appearance.

Cement resistor only describes the appearance of common power resistors like that shown above. The resistor is made by taking an alumina or ceramic substrate. The carbon film is a resistive material toward the flow of current in this resistor. Terminals are attached and the insulation coating is applied to the outside.

The end connection electrode bases are then placed onto this and then this is fired to ensure they are robustly held in place. The majority of the power wirewound resistors have a ceramic core and a ceramic coating to protect the winding. The ceramic coating combines a high insulation and physical protection with good heat dissipation. Metal film resistors are produced by depositing a resistive element on a high grade ceramic rod.

The construction of a resistor is shown in the below diagram. However even this description is out of date. 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.