What is resistor? A resistor is a passive electronic component that limits or controls the flow of electric current in a circuit. It is designed to introduce a specific amount of resistance to the flow of electrical charge. The unit of resistance is the ohm (Ω). Resistors are commonly used in electronic circuits for various purposes, such as: Voltage division: Resistors are often used to create voltage dividers, dividing a voltage into smaller parts. Current limiting: They restrict the flow of c