Resistors are an electric circuit component that implement electrical resistance as a circuit element, and protects other components that have a specific current rating. A low temperature coefficient of resistance is important to ensure that the resistance changes minimally with increased temperature.

Resistors are available in several common forms:

  • wire wound resistors formed from winding fine nichrome wire around a ceramic centre
  • film resistors formed from carbon or metal film deposited on a resistive base
  • carbon-composition resistors formed from bonded carbon powder.

Variable Resistors have resistance values that can be adjusted. These adjustable resistors are an important application for Nichrome or nickel chrome resistance wires.