A relay is used to __________.

A relay is primarily used to control high-power circuits. This electromechanical device works as a switch that opens and closes circuits electronically or electromechanically. The relay uses a smaller control current to switch a larger power circuit, making it effective for handling devices or systems that require more power than what the control circuit can directly manage.

In practical applications, relays enable users to control high-voltage equipment safely from low-voltage control systems, providing an important safety mechanism as well as enhanced functionality in automation and control systems. By enabling the operation of high-power devices using low-power signals, relays facilitate the safe and efficient management of electrical circuits across various applications.