Working of an Electric Bell

An electric bell is a device that uses an electromagnet to produce sound when it is connected to an electric circuit. It consists of several components that work together to create the ringing sound. Let's understand the working of an electric bell in simple language:

1. Power Source:
An electric bell is connected to a power source, such as a battery or a power outlet. The power source provides the necessary electrical energy for the bell to function.

2. Electromagnet:
Inside the bell, there is an electromagnet. It is made up of a coil of wire wound around an iron core. When an electric current passes through the coil, it creates a magnetic field around the iron core.

3. Armature:
The electromagnet attracts an iron piece called the armature when the current flows through it. The armature is a small metal strip or a rod that is placed near the electromagnet.

4. Contact Points:
There are two contact points, one fixed and the other movable, located near the armature. These contact points are made of a conducting material, such as metal.

5. Circuit Breaker:
The movable contact point is attached to a spring, which presses the armature against the electromagnet when no current flows through the coil. This contact point is also connected to a circuit breaker.

6. Push Button:
When the push button of the electric bell is pressed, the circuit is completed, and the current starts flowing through the coil.

7. Electromagnet Activation:
As the current flows through the coil, it creates a magnetic field, which attracts the armature towards the electromagnet. This causes the movable contact point to break the circuit.

8. Circuit Breakage and Sound Production:
When the circuit is broken, the current stops flowing through the coil. As a result, the magnetic field around the electromagnet weakens, and the armature is released. The spring pushes the armature back, reconnecting the circuit.

9. Cycle Repeats:
As the circuit is reconnected, the current flows through the coil again, creating a magnetic field. This attracts the armature, breaking the circuit once more. This cycle repeats rapidly, causing the armature to vibrate back and forth. These vibrations produce the ringing sound.

10. Sound Stops:
When the push button is released, the circuit is opened, and the current stops flowing through the coil. As a result, the armature rests in its initial position, and the sound stops.

In this way, an electric bell works by using an electromagnet, armature, contact points, and a circuit breaker to produce the ringing sound when the circuit is closed.