Question

Make a diagram of electric bell and explain its working system.

Answer 1

The electric bell: Figure shows a simple electric bell. It consists of an electromagnet, an armature, a contact adjusting screw, A gong and hammer. The armature consists of a soft iron rod mounted on a spring. One end of the iron rod presses against the top of the contact adjusting screen.
When the switch is pressed on, current flows in the electromagnet. It then attracts the iron rod towards itself, causing the hammer to strike the gong. At the same time, the armature loses contact with the screw and the current is switched off. This causes the electromagnet to lose its magnetism and the armature springs back to its original position to close the circuit once again. Current flows again and the cycle repeats itself till the current is switched off.