There are many kinds of resistors, I will simply say. Carbon film resistance, with porcelain core, carbon film "carbon fired vapor deposited on porcelain core", wire. cement resistance, cement, resistance wire, wire. Metal resistance, porcelain core, metal film or metal oxide film, wire. Thermistors, photoresistors, varistors, PTC, NTC, semiconductor materials, wires, housings. There are also printed resistors.
