What is the primary function of resistors in circuits?

The primary function of resistors in circuits is to limit the flow of electric current and provide a specific resistance. By doing this, resistors help protect sensitive components from excessive current, which could potentially damage them. This protective function is crucial for maintaining the integrity and functionality of electronic circuits.

Resistors serve not only to control current but also to divide voltage in circuits, ensuring that all parts operate within their designated parameters. While resistors do have a secondary role in power dissipation and can contribute to circuit stability, their central purpose revolves around controlling and protecting the circuit from being overwhelmed by electric flow.

In contrast to the other options, increasing voltage involves components like transformers, measuring current typically relies on ammeters or shunt resistors, and storing energy is primarily the function of capacitors or inductors. This distinction underlines the unique role of resistors in circuit design and function.