La plate-forme collaborative de bricolages scientifiques et pédagogiques


Note (?)
Difficulté (?)
Durée (?)2h 30 min.
Coût (?)~6 CHF
Langueenglish français
License (?)

This Indian project helps to understand how it is possible to produce electricity from a magnet, a copper coil and a movement. The same principle is used in most electricity plants. Depending on the plant, the movement is produced by different means (for instance by transferring the strength of water or steam to turbines). 


In the case of this DIYs project, the movement is produced by the pressure of the air. This pressure is transfered to a turbine. The turbine rotates an electric generator which supplies electricity to a LED light on top of the bottle.


Following the same concept, engineers are trying to produce electricity from the movements of waves or tides. These new sources of energy are renewable and do not produce any pollution. They could be an answer to some of our environmental issues.




Make two holes in a film can near its opening. Press two straw pieces as bush bearings. ...
This is a view from the top with the two straws push through the holes of the film can.
Take a piece of rubber and stick two neodymium magnets in between.
Poke a piece of bicycle spoke in the rubber as the axle or the shaf.
And now weave the two bicycle spokes in the two bearings.
One hole in the film can is split. This helps to put the axle in place.
Wind 800 turns of thin enamelled (insulated) copper wire (36 gauge) aroung the film can.
Scrape the copper wire ends with sand paper and connect them to a LED.
When rotating the spoke, the LED should light up.
Fold a strip of stiff card to create a turbine.
This is the turbine finished
Attach the turbine to the end of the bicycle spoke.
Using two sticks, fix and glue the generator to a bottle cap with a hole.
Screw the cap on a plastic bottle with the bottom part cut off.