A relay is an electrical switch that uses an electromagnet to move the switch on and off. It only takes a small amount of power to turn on a relay that control something draws much larger power such as an air conditioner.
In this circuit we used a double pole double throw (DPDT) relay for our experiment. But we only used one pole. A DPDT relay can also be used to change the polarity at the terminals of a device connected at output. For example to drive a DC motor in both clockwise and anticlockwise directions.
The LED is activated by a pushbutton. When the button is pressed, the relay caused the first LED goes out and the second LED lights up. When you release the pushbutton, the first LED lights up and the second one goes out.
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