An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring...

Introduction:
An electric bell is a simple device that converts electrical energy into sound energy. It is commonly used in homes, offices, schools, and other places to indicate the occurrence of specific events or to alert people.

Components of an Electric Bell:
An electric bell consists of the following components:
1. Electromagnet: It is a coil of wire wound around an iron core. When an electric current flows through the coil, it becomes magnetized and attracts the metal armature.
2. Armature: It is a piece of iron or steel that is attracted towards the electromagnet when the current flows through it.
3. Spring: It is attached to the armature and provides the restoring force to bring the armature back to its original position when the current is switched off.
4. Hammer: It is connected to the armature and strikes the gong to produce sound.
5. Contact Points: These are two metal strips that are in contact with each other when the circuit is closed. When the current flows, the contact points separate, breaking the circuit and stopping the flow of current.

Working Principle:
The working of an electric bell is based on the principle of electromagnetism and electromagnetic induction. Here is a step-by-step explanation of its working:

1. When the switch is closed, an electric current from the power source flows through the coil of the electromagnet.
2. The flow of current creates a magnetic field around the coil, magnetizing the iron core.
3. The magnetized core attracts the armature, causing it to move towards the electromagnet against the force of the spring.
4. As the armature moves forward, it pushes the hammer away from the gong, breaking the contact between them.
5. When the contact between the armature and the hammer is broken, the circuit is also broken, interrupting the flow of current.
6. As a result, the magnetic field around the coil collapses, and the electromagnet loses its magnetism.
7. The spring then pulls the armature back to its original position, reconnecting the contact points and completing the circuit again.
8. This process repeats rapidly, causing the armature to vibrate and the hammer to strike the gong repeatedly, producing a ringing sound.
9. When the switch is opened, the flow of current stops, and the bell stops ringing.

Conclusion:
In conclusion, an electric bell works by utilizing the principles of electromagnetism and electromagnetic induction. When a current flows through the coil of the electromagnet, it magnetizes the iron core and attracts the armature. This movement causes the hammer to strike the gong, producing sound. The continuous interruption and restoration of the circuit through the contact points make the bell ring.