A relay is an automatic electrical appliance that controls the "on" or "off" of a circuit based on external input signals; a relay is an electrical control device that controls when the change in the input quantity reaches the specified requirements. , an electrical appliance that causes a predetermined step change in the controlled quantity in the electrical output circuit.
Recommendation: "Programming Video"
A relay is a type of relay that responds to external input signals (electrical signals or non-electrical signal) to control the "on" or "off" of an automatic electrical appliance.
Related introduction:
The relay (English name: relay) is an electrical control device that is used in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. An electrical appliance in which a controlled quantity undergoes a predetermined step change. It has the interactive relationship between the control system (also called the input loop) and the controlled system (also called the output loop). Usually used in automated control circuits, it is actually an "automatic switch" that uses small current to control large current operation. Therefore, it plays the roles of automatic adjustment, safety protection, and conversion circuit in the circuit.
The above is the detailed content of What is a relay used to control a circuit?. For more information, please follow other related articles on the PHP Chinese website!