Cement or Ceramic Resistors fall into the category of wire-wound resistors. wire wound resistors are electrical passive components that limit the flow of current in a circuit. The resistive element exists out of an insulated metallic wire that is winded around a core of non-conductive material. The wire material has a high resistivity, and is usually made of an alloy such as Nickel-chromium (Nichrome) or a copper-nickel-manganese alloy called Manganin. The Wire Wound assembly is then coated with a ceramic or cement core material. Wire wound resistors are the oldest type of resistors that are still manufactured today. They can be produced very accurate, and have excellent properties for low resistance values and high power ratings. Because of the wire wound characteristic of these resistors, they can be inductive.