Resistors are some of the simplest and most common electrical components, appearing in most electric circuits.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. The current through a resistor is in direct proportion to the voltage across the resistor's terminals.

Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment. A resistor is made out of material that conducts electricity less efficiently than a normal wire, allowing you to control the amount of current passing through a circuit.

Practical resistors can be made of various compounds and films, as well as resistance wire (wire made of a high-resistivity alloy, such as nickel-chrome). Resistors are also implemented within integrated circuits, particularly analog devices, and can also be integrated into hybrid and printed circuits.