A resistor is an electronic component that is designed to resist the flow of electric current. It is used to control or limit the amount of current that flows through an electric circuit. Resistors are typically made of materials such as carbon, metal, or wire.
Materials that have no resistance are known as superconductors, which means that they can conduct electricity with zero resistance.
Some materials with high resistance include rubber, glass, and dry air.
The equation for resistance is given by:
R = V/I
where R is resistance, V is voltage, and I is current. The SI unit for resistance is the ohm (Ω), which is defined as the resistance between two points in a conductor where a constant potential difference of 1 volt produces a current of 1 ampere.