Which of the following describes a function of a circuit breaker?

A circuit breaker is primarily designed to protect electrical circuits from overloads and short circuits. When the current flowing through a circuit exceeds the safe limit, the circuit breaker automatically interrupts the flow of electricity, preventing damage to the electrical system and reducing the risk of fires or electrical shock. This safety function is crucial in maintaining the integrity of the electrical system and ensuring the safety of individuals using electrical appliances and systems.

The other options refer to different capabilities that are typically associated with other electrical components. While regulating electrical flow and transforming current are functions related to devices like resistors and transformers, respectively, increasing voltage is a function associated with transformers, not circuit breakers. Therefore, the emphasis on protection from electrical overload accurately describes the unique and critical role that circuit breakers play in electrical safety and management.