What is the role of resistors in a circuit?

Resistors play a fundamental role in electrical circuits by providing resistance to the flow of electric current. This opposition to current flow is crucial for controlling the amount of current that passes through various components in the circuit. By changing the resistance in a circuit, resistors can help regulate voltage levels and limit current, ensuring that other components (such as LEDs, transistors, or integrated circuits) operate within their specified voltage and current ratings.

Additionally, resistors help protect sensitive components from excessive current, which could potentially lead to damage. They are essential for the proper functioning of voltage dividers, biasing of transistors, and many other applications where precise control of current and voltage is required. Thus, the primary function of resistors is to control and manage the flow of electric current, maintaining the integrity and functionality of the entire circuit.