what is the function of relay in electronic circuit?

A relay is an electronic switch. Look at it as the same as your light switch on the wall only its activated by an external current. In the case of a traffic light, a low voltage signal (approx 5 volts logic) will activate a relay (switch) that will send the 120 VAC to the lamp. Relays are often used to engage motors, pumps, lights and such.
 
A relay is an electronic switch. Look at it as the same as your light switch on the wall only its activated by an external current. In the case of a traffic light, a low voltage signal (approx 5 volts logic) will activate a relay (switch) that will send the 120 VAC to the lamp. Relays are often used to engage motors, pumps, lights and such.
 
Back
Top