Which component limits the flow of current in a circuit?

The component that limits the flow of current in a circuit is the resistor. Resistors are designed to oppose the flow of electric current, which is based on Ohm's Law, where voltage equals current times resistance (V = IR). By providing a specific resistance value, a resistor can effectively control the amount of current that flows through a circuit for a given voltage. This voltage drop across the resistor can be calculated easily, allowing designers to manipulate current levels for the desired outcome in various electronic applications.

In circuits, resistors are used to manage current levels to protect sensitive components, divide voltages, or set bias points in certain devices. They play a crucial role in ensuring that current levels remain within safe and functional limits for all components in the system. Understanding how resistors function is fundamental to designing and analyzing electrical circuits.