Diapositiva 1

Project on Sources of Energy-Hub DynamoGuided by:-Mr. L.N. Gupta(P.G.T Chemistry)Presentation by XI-A:-Prashant KumarAnkit Singh TanwarSanyogita SinghNancy KumariAditya SahuNirmal Kumar

ContentsSome Terms and DefinitionsIntroduction to the ProjectWorking of DynamoFlowchart- DynamoGoing through the ProjectWorking with the Model

Some Terms and DefinitionsWhat is Rotational Energy? TheRotational energy (a type of mechanical energy), also known as angular kinetic energy is the kinetic energy produced because of the rotation of an object or an entity and is a fraction of its total kinetic energy. What is Electrical Energy? Electrical energyis theenergycarried by moving electrons in an electricconductor. It cannot be seen, but it is one of our most useful forms ofenergybecause it is relatively easy to transmit and use.

Rotational EnergyElectrical Energy

What is a Dynamo?A dynamo is a machine for converting mechanical energy into electrical energy, typically by means of rotating coils of copper wire in a magnetic field.What is a Hub Dynamo(Bicycle Dynamo)? A small generator is fitted to a bicycle to provide electricity for the lights at night. The generator is called a hub dynamo. It is also known as Bicycle Dynamo. the hub dynamo is (usually) not actually a dynamo, which createsDC, but a low-powermagnetothat createsAC.

DynamoWorking of Hub Dynamo

Working of DynamoInside thedynamoapermanent magnetisrotated in themiddleof somecoilsofwire. Rotatingthemagnetinstead of thecoilshas the advantage thatslip ringsare notneeded. Therotatingmagnetproduces achanging magnetic field and thisgenerateselectricityin thecoilsofwire. Thetopof thedynamois touched against therimof the tyre whichrotateswhen thebicycleismoving.

Flowchart Displaying the Working of a Dynamo

Let us first know what the project is about.Suppose you have a bicycle which lacks light in front and/or back. During the night time, you find that there is a lot of risk while riding the bicycle without any lights in it. And at this time of night, youll need a backlight or a front light to counter this difficulty to ride the bicycle safely. And a solution is the Use of Dynamo in your bicycle. The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.However, the difficulty expressed above can simply be solved by applying the battery instead of dynamo. But, you might face a lot more drawbacks in this case(as mentioned later). The battery could get low in charge while youre riding your bicycle.It could even malfunction working(as happens in many cases).But, dynamo vanishes all the risks and even, though little, saves energy.One can also store this energy for sustainability. Introduction

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Conversion from Mechanical Energy to Electric Energy using dynamo in bicycle:

Renewable Source of Energy

Going through the Project

1.Rear tyre of Bicycle4.Small tyre connected to dynamo3.Bicycle Stand Connected with the Carriageto manage bicycles portability5.Carriage of the bicycle (connected to the stand to maintain the portability)2.Backlight (glows when tyre is rotated)Dynamo

Explanation to the Project.

The bigger tyre is the rear- tyre of bicycle and is connected with a stand(portable). The stand is further connected to a see-saw tail of the bicycle. When the tail is pressed from the right-end, the smaller tyre gets in contact with the bigger one.And when the rider paddles the bicycle, both the tyres move and the light is emitted. In this way, the production of electrical energy takes place from the mechanical energy by rotation of the tyres.

Working with the Model

Uses of Dynamo-in-BicycleTo power bicycle lights w/o having to rely on batteries.To avoid accidents during the night.Safer to use.One can store energy for future use(in case the system gets broken).Unlike a few battery systems, the rider can use it whenever he wants.Batteries run out and you wont carry a set of batteries whenever you go out.Unlike non- biodegradable batteries, it does not harm the environment.Hub Dynamos are lighter and easier to use.A dynamo and lights don't get stolen as easily as battery lights which are mostly designed for easy removal.It was compulsory once in Germany to use the dynamo system in bicycle.

However, it does face a couple of drawbacks. First of all, it is a little heavier than the batteries. Secondly, it slows you down a bit while riding.

Referenceshttp://www.gcsescience.com/pme21.htmhttp://www.livestrong.com/article/http://exege.com/dynamoshttp://en.wikipedia.org/wiki/Dynamo

Class XI a Kendriya Vidyalaya Janakpuri, New delhi