What is the role of a resistor in an electrical circuit?

A resistor plays a key role in an electrical circuit by limiting the flow of current. This is achieved through its inherent resistance, which causes it to oppose the flow of electric charge when voltage is applied across it. By doing so, the resistor helps to control the amount of current that can pass through the circuit, ensuring that components are not damaged by excessive current levels or that the current stays within safe operating limits.

This function is critical for the overall safety and functionality of electronic devices and circuits, as it prevents overheating and potential failure of sensitive components. Resistors are widely used for tasks such as adjusting signal levels, dividing voltages, and protecting components from excessive current. Thus, understanding the role of resistors in a circuit's operation is fundamental in both basic and advanced electronics.