Working of an electric bell:
- When the bell is pressed, the contact screw touches the iron strip and the circuit is completed.
- The current starts flowing through the coil.
- The electromagnet becomes magnetised and the soft iron armature is attracted towards the electromagnet. The movement of the iron causes the hammer to hit the gong.
- This movement breaks the circuit at point P, so that the current stops flowing and switches off the electromagnet.
- The spring pulls the armature back to its original position, the circuit is remade and the process starts over again. This is how the bell rings.
