what is relay in physics
Answers
A relay is a special type of switch turned on and off by an electromagnet . The electrical symbol for a relay. Diagram of a simple relay. When a current flows through the coil, an electromagnetic field is set up. The field attracts an iron armature, whose other end pushes the contacts together, completing the circuit.
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Answer:
A relay is classified into many types, a standard and generally used relay is made up of electromagnets which in general used as a switch. Dictionary says that relay means the act of passing something from one thing to another, the same meaning can be applied to this device because the signal received from one side of the device controls the switching operation on the other side. So relay is a switch which controls (open and close) circuits electromechanically. The main operation of this device is to make or break contact with the help of a signal without any human involvement in order to switch it ON or OFF. It is mainly used to control a high powered circuit using a low power signal. Generally a DC signal is used to control circuit which is driven by high voltage like controlling AC home appliances with DC signals from microcontrollers.
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