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Solar food dehydrator

Solar energy is commonly used to produce hot water or electricity for our buildings. Another, lesser known use is for drying food.This technology allows fruit, vegetables, fish or meat to be dried without the use of fossil fuels and pollutants. With less moisture, food can be stored for long ... »
drying, fossil, fuels, pollutants, moisture
Note
Difficulté
Durée3h 0 min.
Date25.07.2022
Langue(s)
français english

Faraday torch

Building a Faraday* torch 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 ... »
faraday, torch, magnet, coil, transferring
Note
Difficulté
Durée4h 0 min.
Date22.07.2022
Langue(s)

'Perpetual' motion machine

Since ancient times, scientists have wondered whether it would be possible to create a machine that, once started and without adding extra energy, would never stop. Even Leonardo da Vinci tried to imagine such a mechanism, but found it impossible.   Even if we know it's impossible, some people are ... »
perpetual, mathematician, prevents, validated, mechanics
Note
Difficulté
Durée2h 0 min.
Date22.07.2022
Langue(s)
français english

Led lamp

This project goal is to build a simple table lamp using an LED bulb. This is an opportunity to present tje many adavantages of light emitting diodes (LED) which have now replaced the classic incandescent light bulbs in Europe : Very good energy efficiency (for the same amount of light, LED bulbs ... »
lamp, bulb, emitting, diodes, incandescent
Note
Difficulté
Durée2h 0 min.
Date22.07.2022
Langue(s)
français english

Catapult

This is a simple catapult model built with some very common objects.   This weapon of war was used in Greek and Roman Antiquity as well as in the Middle Ages. It could launch heavy stone bolders through a system of spring and without explosives.   This project is a good way to introduce children to ... »
catapult, weapon, explosives, mechanics
Note
Difficulté
Durée0h 30 min.
Date22.07.2022
Langue(s)
français english
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