What is the function of a relay in electric systems?

A relay functions primarily as an electromechanical switch that allows or interrupts the flow of electricity in a circuit based on a control signal. It operates by using a small amount of power to control a larger current. When the control signal activates the relay, it closes or opens the contacts within the device, enabling or disabling the flow of electricity through a circuit. This function is essential for automating control systems, protecting circuits, and managing power distribution in electrical systems.

Relays are crucial in applications such as motor control, lighting control, and safety interlocks, where it is necessary to manage significant power loads without manually handling direct currents. Their ability to interface with low-power control systems while effectively managing higher power circuits exemplifies their role in electric systems.

Understanding the relay's role in controlling electric flow emphasizes its versatility and importance in ensuring safe and efficient operation of electrical machinery and systems.