Resistors Classified By Material

a. A wire wound resistor is made by winding resistance wires into a resistor, which is made by winding high resistance alloy wires on an insulating framework and coated with a heat-resistant glaze insulation layer or insulating paint on the outside. Winding resistors have a low temperature coefficient, high resistance accuracy, good stability, heat resistance and corrosion resistance. They are mainly used for precision high-power resistors, but their disadvantages are poor high-frequency performance and large time constants.
b. Carbon composite resistors are made by pressing carbon and synthetic plastic.
c. A carbon film resistor is made by coating a layer of carbon on a ceramic tube and depositing crystalline carbon onto the ceramic rod skeleton. Carbon film resistors are currently the most widely used resistors due to their low cost, stable performance, wide resistance range, low temperature and voltage coefficients.
d. A metal film resistor is formed by coating a layer of metal on a ceramic tube, and the alloy material is evaporated onto the surface of the ceramic rod skeleton by vacuum evaporation.
Metal film resistors have higher accuracy, better stability, lower noise, and temperature coefficient than carbon film resistors. It is widely used in instruments and communication equipment.
e. A metal oxide film resistor is formed by coating a layer of tin oxide on a ceramic tube and depositing a layer of metal oxide on an insulating rod. Due to its inherent nature as an oxide, it is stable at high temperatures, resistant to thermal shock, and has strong load capacity. It can be classified according to its purpose, including general-purpose, precision, high-frequency, high-voltage, high resistance, high-power, and resistance network.