Conversion Of galvanometer into an ammeter

Methods for magnetizing and demagnetizing a magnet

        METHODS FOR MAGNETIZING A MAGNET

1)RUBBING:

                 The most common method of magnetizing a magnet is rubbing.Rub the iron rod with a magnet in the direction from North to South.Repeat this process several times,the magnet will be magnetized.

2)ELECTRIC CURRENT:

                The most efficient method of magnetizing is to pass an alternating current from the U-shaped bar wounded with an insulating copper wire.

           METHODS OF DEMAGNETIZING A MAGNET

1)HEATING:

              The magnet should be placed in an east west direction and should be heated gently for demagnetizing.

2)HAMMERING:

              The magnet should be hammered in order to be demagnetized.

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Information about DC Motor

DC MOTOR:

                        A DC Motor is a device which converts electrical energy into mechanical energy.
               The first DC motor was invented in 1832 by a British scientist William Sturgeon.
CONSTRUCTION:
                A DC motor consist of:

• split rings
• carbon brushes
• permanent magnet
• coil of copper wire

             and

• inverters

SPEED OF A DC MOTOR DEPENDS UPON:

• magnetic field of a permanent magnet
• no. of turns in the rotor
• the voltage across the armature

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Making a shutter for a pinhole camera

MAKING A SHUTTER:
          Making a shutter for your pinhole camera is not a difficult thing.
PROCESS:
1)Cut a small piece of card sheet.
2)Wrap it with black tape.
3)Using the tape stick it infront of the hole in such a way that it can be opened or closed easily.

How to make a pinhole camera

INTRODUCTION TO PINHOLE CAMERA

A pinhole camera is an important optical instrument.It was first invented by a Muslim scientist      Ibn-ul-Haitham in sixteenth century to obtain the image of sun eclipse without damaging the eyesight.It is also known as "Camera Obscure"(dark room).

CONSTRUCTION OF A PINHOLE CAMERA

MATERIAL:

Pinhole camera consist of a:

rectangular light proof box

a needle for making small hole in the  box

brass shim or can

photographic paper

PROCESS:

1)Take a rectangular box and cover it with a dark paper or cloth so that light cannot enter the box.

2)With the help of a needle, make a small hole on one side of the box.

3)On the inner side of the box stick a small piece of can or brass shim having a tiny hole.

4)Cover the pinhole with a shutter.
     for more information about shutter visit

Making a shutter for a pinhole camera

  

    You are done.

TESTING:

For testing your camera,inset a photographic plate on the opposite side of the hole.For better results try to capture the image in sunlight.

For capturing the image,open the shutter for 25-30 seconds and then close it.Go to a dark room and develop your photograph.

                       

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www.quotesaboutability.blogspot.com

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how to make a robot in 10 minutes,4 steps with picture.

        MAKE A REMOTE CONTROL ROBOT JUST IN 10                                            MINUTES

                In this blog I an going to show you the method that how you can convert a remote control car into a remote control robot.Remote control cars are just useless because they cannot carry any material on them and they can't help you in transferring material from one place to other.

If you want to convert your remote control car into a remote control amazing robot then you are on a write place and you can read further.Follow all the steps given below carefully.

So,Lets get started.

STEPS            

  1)Choose a remote control car with a nice speed.Must make sure that the base of the car is strong and can carry some weight

                                          jobpamphlet.blogspot.com

  2)Remove the cover from it carefully so that you can avoid the damaging of the machinery of the remote control car.Cover this base of the car with a card board.Then it will look like a skate board.

                                         

jobpamphlet.blogspot.com

 3)Design the structure of robot on a metal sheet or a card sheet.Make sure that it i strong.
  jobpamphlet.blogspot.com   

 4)Then attach the robot over the base of remote control car.

                                                                                                                        jobpamphlet.blogspot.com

5)You can add some more function in you robot

• You can add a compass in the front of your robot.

For more information about attaching the compass you can visit

                              attachingcompass.blogspot.com

• You can make a shelf inside your robot.

For more information about how to make a shelf you can visit

                        makingshelf.blogspot.com

• Design the hand of robot in such a position so that it can transfer things from one place to other according to your command.
• You can attach small toy bulbs in the robot for a better look.

                         

• You can place a mp3 or a radio inside it's head.So that others can also get impressed by your brainstorm creation.And you will also not get bored of your robot by listening different songs.

 This robot is ready to impress every one with it's design and function.
ENJOY,PLAYING WITH YOUR ROBOT.    

               
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  If you want to earn money by selling these kinds of robots,then visit
                                     jobpamphlet.blogspot.com
You might like:
                   quotesaboutability.blogspot.com
                   99namesofking.blogspot.com

                               
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