12 CLASS PHYSICS PROJECT

how to make a disco generator

things you need for it are a wooden board ,two old c.d,a machine bobbin,glue,l.e.d bolt nut,washers,thin insulated copper wires,disk magnets and a lid. 

first make a 500 turn insulated copper wire coil and scrape its end and attach to L.E.D..make 5 such sets.

on on old c.d paste 4 strong disk magnets on its diameter end and paste a washer on its 

center. On wooden board paste old c.d and paste bobbin with washer and nut at center .Now paste coil and l.e.d combination on diameter ends.

Now place the magnet disk containing c.d on the another c.d . Place handle . Now rotate upper c.d in a dark room and see the fun.

PRINCIPLE BEHIND IT ........

This project work on electromagnetic induction..


"when a magnetic field embracing a conductor moves relative to the conductor, it produce  a 

flow of electrons in the conductor. This phenomenon whereby an e.m.f.  and hence current  is 

induced in any conductor which is cut across or is cut by a magnetic flux is known as 

electromagnetic induction". This law was stated by faraday.

for more help visit link video.


please visit the refrence site for more such projects--- http://www.arvindguptatoys.com/toys/multiplegenerator.html

11 CLASS PHYSICS PROJECT

how to make a pump pen.

For making pen pump we need a pen,a refill,a small bearing ball of metal,a straight wire or we can use a cycle spoke,thread and scissor.

First of all we will make a hole in pen with hot pin or scissor near back cap of pen.We take the cycle spoke and tightly wrap the thread on it to make a piston.We drop the ball in the pen. We make a hole in back cap so that the spoke can move freely.Then we insert the soke piston and finally screw the end cap.At last we place the pump in a mug of water and move the cycle spoke up and down .We will see that water will come up with a flow after a few strokes.


NOW WHAT IS THE PRINCIPAL BEHIND THIS .LET SEE ..........

PRINCIPLE

The basic principle behind this project is Bernoulli’s theorem.

WORKING

 It is basically an application of Bernoulli's Principle, which states that as the velocity of flow in a fluid increases, the pressure in that fluid decreases. Bernoulli's principle only applies when no work is done. Bernoulli principle is approximated if a small amount of work is performed.  In the case of the pump, the hole performs a small amount of work on the air, resisting the flow and requiring a higher pressure inside the tube to compensate, but the pressure still drops below ambient as the air accelerates into the hole. In simple language

"The hand pump actually has a chamber in which pressure is created when you do pumping. The water in the ground replaces the pressure and then gets out thru the outlet. Repeated pumping creates pressure high and low. And water comes in and goes out. Hope u understands".

For more help please visit the link pen pum to get more help..

This is a nice project .. it will help you to score better because you are making a nice project without wasting time and money . it will cost you around 10-15 INR.

thankyou bye-bye.........

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