What is the primary role of a resistor in electrical circuits?

The primary role of a resistor in electrical circuits is to limit current flow and adjust voltage levels. Resistors are designed to oppose the flow of electrical current, which creates a drop in voltage across them according to Ohm's Law (V = IR). By doing so, they effectively manage the amount of current that can pass through a circuit and allow for voltage levels to be adjusted to meet specific circuit requirements or to protect other components from excessive current. This function is critical in ensuring that electronic devices operate safely and efficiently.

In contrast, resistors do not generate electrical energy, store electric charge, or enhance current strength. They specifically serve the purpose of controlling and managing electrical properties rather than creating or accumulating them.