So the cycle starts newly. Thus the electromagnet switches off and switches on the circuit successively and also makes the hammer to hit the bell. The pushing of the doorbell closes an electric circuit. Then electric current flows through an electromagnet, and the doorbell rings. in other words In most wired systems, a …button on the outside next to the door, located around the height of the doorknob, activates a signaling device (usually a chime, bell, or buzzer) inside the building.