The Electric Bell | Grade: 08th

Electric Bell: Concept

The Electric Bell | Grade: 08 |

Working Principle of the Electric Bell:

As we know, an electro-magnet is formed by coiling multiple turns of insulated wire around a magnetic substance such as soft iron. When we run current through such an electromag-net, this soft iron behaves like a magnet. This is the principal behind the electric bell. Lets use this science concept to build an electric bell!

The basic Electric Bell is designed as shown in the diagram in the centre.

The Electromagnet consists of a Solenoid (coil made of

hundreds of turns of copper wire) with an iron Core passing through it.

The working principal is as follows:1. Once the battery is con-nected a current flows in the wire loops around the soft iron core. This turns the core into an Electromagnet.

2. The electromagnet attracts the hammer which is also made of soft iron.

3. As the clapper moves towards the electromagnet, it causes the hammer to strike the bell. At the same time it breaks the circuit at X.

4. The break in the circuit caus-es the current to stop flowing. The soft iron cores loses it’s magnetic field and releases the armature which springs back to it’s original position.

01

5. When the armature goes back to its original position, the contact screw touches the springy metal and completes the circuit, creating an electro-magnet that again attracts the armature, and the armature hammer once again strikes the bell. The whole cycle is repeat-ed over, causing the bell to ring continuously until the battery is disconnected.

Fun Facts:Did you know that there is another type of Bell called the Oxford Bell that operates on the principle of Elec-trostatics. Although it did not become popular like the Electric Bell, there is an Oxford Bell that has been ring-ing continuously since 1840! This bell is at the Ox-ford University, England.

A solenoid (from the French solénoïde, derived in turn from the Greek solen "pipe, channel" + combining form of Greek eidos "form, shape" is a coil wound into a tightly packed helix. The term was invented by French physicist André-Marie Ampère to designate a helical coil.

In physics, the term refers specifically to a long, thin loop of wire, often wrapped around a metallic core, which produces a uniform magnetic field in a volume of space (where some experiment might be carried out) when an electric current is passed through it. Sole-noids are important because they can create controlled magnetic fields and can be used as electromagnets.

The Electric Bell | Grade: 08 | 02

Electric Bell: The Making of it!What we need ?

1. Solenoid 2. Clapper 3. 9v Cell 4. Connecting wires and Crocodile Clip

5. Bell6. Screw Holder

7. Battery Stand

10. Assembly Base9. Nut & Bolt

8. Signage

The Electric Bell | Grade: 08 | 03

Electric Bell: AssemblyStep: 01Place the Assembly Base on tflat surface

Step: 02Tighten the solenoid over itwith the help of nut.

Step: 03Plug in Battery stand + Screw Holders + Bell Hang-er on the place

Step: 04Fix the clapper with nut and screw at holder A. Insert the Battery in the stand.

The Electric Bell | Grade: 08 | 04

Step: 05Connect the wire with the help of crocodile clip as shown below in the dia-

Step: 06Fine tune the screw B to make it touch clapper softly to complete the circuit.

Step: 07Fine tune the Bell. Adjust the distance between wob-bling clapper to ring the bell

Excercise Complete.Cheers!

The Electric Bell | Grade: 08 | 05

CURIOSITI: THE ELECTRIC BELLGrade: VIIIFirst Edition 2013

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