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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)

Educated monkey

Inspired by an American tin toy of around 1916, this educated monkey performs multiplications without any mistake.   His feet show the two numbers to multiply and a hole above his hands shows the correct result.   The mechanism of this project is very interesting and can be studied and discussed. ... »
multiply, hole
Note
Difficulté
Durée0h 45 min.
Date20.07.2022
Langue(s)

Solar fuel cell

This project illustrates the principle of an 'ecological' fuel cell. Using a photovoltaic solar cell, electrolysis is carried out to separate hydrogen from the oxygen contained in the water. Then it is possible to produce electricity the other way round and lit up a small LED bulb. The ... »
illustrates, ecological, photovoltaic, electrolysis, oxygen
Note
Difficulté
Durée2h 0 min.
Date20.07.2022
Langue(s)
français english

Molding

A cast allows, for example, to reproduce a sculpture. For instance, in the casting room of the University of Geneva, almost all the statues are reproductions.   This project helps to understand the different stages of the molding process.   Depending on the technique, the mold is broken to extract ... »
casting, geneva, extract, reused, advisable
Note
Difficulté
Durée1h 0 min.
Date20.07.2022
Langue(s)
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