Working of an Electric Bell

Edited By Vishal kumar | Updated on Sep 24, 2024 06:43 PM IST

In this article, we will study a very important concept of class 7 in physics, electric bell and electric bell diagram.
So, the topics that that we are going to cover in this article is what is electric bell, electric (door) bell diagram, principal on which electric bell works, we will explain working of an electric bell that is how does an electric bell works, electric bell diagram, how to make an electric bell, circuit of an electric bell and what is electromagnet and how electromagnet is used in electric bell.

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What is electric bell?
Principal on which electric bell works
Working of an electric bell

Working of an Electric Bell - A Complete Guide

let’s start with our topics one by one for easy understanding of the concept.

What is electric bell?

Bell – bells are the instruments that generate vibrations or sound on triggering. There are many types of bells like temple bell, school bell alarm clock bell and doorbell etc.

In class 7 we are understanding how does an electric bell works mainly.

Definition of electric bell- electric door bell is bell that is used usually in our homes, and after pressing the switch, circuit working on the principle of electromagnet, is completed hence leading to triggering of the sound.

Also read -

Electric (door) bell diagram

Electric bell is a circuit of various parts like gong, electromagnet, hammer, adjusting screw, armature, metallic strip, switch and a battery for bell.

As we can see in this diagram of electric bell one end of the electromagnet is connected to the terminal t1 that is switch of the circuit and another is connected to second terminal t2 that is battery of bell. When the hammer at the top touches the adjusting screw, the steel rod functions as a spring hence, the hammer contacts the other terminal of the battery and that’s hoe this circuit performs its individual function.

Now, let’s see how to draw a labelled diagram of an electric bell.

diagram of electric bell

How to draw electric bell (easy diagram)

This is the image of easy bell diagram.

construction and working of an electric bell

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Principal on which electric bell works

Electric bell works mainly on the principal of electromagnet that is magnetic effects of current.

So, before knowing the principal we all should be aware with the term electromagnet because electric bell has electromagnet as its main component.

What is electromagnet?

Electromagnet is a type of magnet, used in electric bell, in which wire is wounded around the soft metal core and by passing the current through it, that metal core acts like a magnet. Hence, in this magnetic field is being generated by flowing electric current through the surface of metal core.

Generally, iron rod is used as an metal core for the purpose of making electromagnet.

The core of the electromagnet is usually made up of soft iron rods because of two reasons mainly, first is that it increases the intensity of the magnetic field of electromagnet and second reason is that it easily gets demagnetized, when no current flows in the turns of the coil of insulated copper wire wound over the core, hence, leading in the flowless working of an electric bell. This is the reason why electric bell has electromagnet.

Also Read: NCERT solutions for Class 7 Physics Chapter 14 Electric Current and its effect

Electric bell contains electromagnet which is being insulated with wire coils wound round iron rods. Through the coils when the electric current flows the magnetic field is hence created by the electromagnet which pulls the armature towards it which leads to the striking of bell. So, due to the flow of the electric current through the coils the iron rods of electromagnets become magnetic in nature. The piece of an iron which is connected to the clapper attracts the iron rod to itself. And when that clapper triggers the bell the bell rings or make sound.

Diagram, schematic of electric bell

Till now, we have seen the construction and working of the electric bell.

At last, we have covered all the topics what is electric bell, electric (door) bell diagram, principal on which electric bell works, we will explain working of an electric bell that is how does an electric bell works, electric bell diagram, how to make an electric bell, circuit of an electric bell and what is electromagnet and how electromagnet is used in electric bell.

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Frequently Asked Questions (FAQs)

1. Who invented electric bell?

Joseph henry was the scientist who invented the first electric doorbell in the year 1831, he was an american scientist who later went on to serve as first secretary of the smithsonian institute of america. But electric doorbell became widespread only after the year 1913, when the introduction of electric transformers eliminated the need for unaffordable batteries and instead relied on a household’s electrical current. In the 1930s, musical door bells emerged as alternative to relatively jarring, monotone buzzers. One of the most popular door bells tunes is the westminster quarters, which can also be heard ringing out from many churches’ bell towers.

2. What are the advantages of electric bell?

Scientific equipment used in preserving cultures.
Replacement of classical bells.
Variety of uses with numerous needy and important features.
Live broadcasting via microphones are done.
Less weight without any risk of structural failure.

3. What are the characterstics of electromagnets?

The important characterstics of an electromagnet are:

(I) an electromagnet is temporary in nature that is, it can be demagnetized when magnet is not in use.

(ii) an electromagnet is made of a soft iron core rod because of it’s nature.

(iii) the magnetic field strength can be changed by various methods like by increasing number of turns on solenoid or by increasing the current in the circuit.

(iv) an electromagnet can be easily demagnetized in a very less interval of time by switching off the current.

4. Does electric bulb also has electromagnet in it’s structure?

No, bulb does not have electromagnet in it. It’s rays are electromagnetic radiations because of light’s nature.

5. Why electromagnet is used in construction of electric bell circuit?

The electromagnet attracts the hammer. Electric bell contains making and breaking of the switch, which the iron armature keeps the bell ringing. It breaks the circuit, so a current no longer flows and hence, making the electric bell ring again and again.

6. Which effect is used in making of electric bulb work?

In electric bulb, the filament of the bulb produces light because of the heating effect of electricity. The filament of bulb is usually made of tungsten metal; whose melting point equal to 3380°c so that it does not melt easily.