What is the primary purpose of a resistor in an electrical circuit?

The primary purpose of a resistor in an electrical circuit is to limit the flow of electric current. Resistors achieve this by providing a specific amount of resistance to the flow, which can help control the current levels to ensure that components receive the appropriate amount necessary for their operation. This is crucial in preventing damage to sensitive devices, managing voltage levels, and dividing signals within the circuit.

While amplifying electric signals or converting AC to DC are functions handled by different components like transistors or rectifiers respectively, and capacitors are typically responsible for storing electrical energy, the fundamental role of a resistor is to control how much current can pass through a circuit. This function is essential for maintaining the stability and reliability of electronic circuits.