What is Resistors ? Resistors are two-terminal electrical or electronic component. Resistors resists an electric current by producing a voltage drop between its terminals. Resistors are used as part of electrical networks and electronic circuits. Resistors are used to create a known voltage-to-current ratio in an electric circuit. Conversely, resistors can be used to create a known current proportional to that difference, if the potential difference between two points in a circuit is known. All resistors dissipate heat. This is the principle behind electric heaters. Reference :Wikipedia, the free encyclopedia