What is the primary function of a voltage regulator?

The primary function of a voltage regulator is to maintain a constant voltage level in electrical systems. This device ensures that the voltage output remains stable despite variations in load conditions or input voltage fluctuations. By providing a consistent voltage supply, voltage regulators protect sensitive electrical components from potential damage caused by overvoltage or undervoltage conditions.

Maintaining a constant voltage is crucial for the proper operation of electronic devices, as many components require specific voltage levels to function effectively. This stability contributes to the safety and reliability of electrical systems, ensuring that they perform optimally under various conditions and preventing issues that can arise from voltage variations.

In contrast, some of the other functions suggested in the options are related to different electrical devices. For example, converting AC to DC voltage is the role of rectifiers, while increasing voltage levels pertains to transformers. Measuring electrical current is handled by ammeters or current sensors. Understanding these distinctions helps clarify the unique role that voltage regulators play in electrical systems.