 | Making a battery helps to understand how a chemical reaction can produce electricity. It shows also that in a battery there is no real stock of electricity, but the chemical products needed to generate some. It is important to understand how batteries work as they are more and more used in our daily ... »
batteries, pads, polluting, kilowatt-hour, mains
| | Note |  | | Difficulté |  | | Durée | 3h 0 min. | | Date | 16.05.2013 | | Langue(s) | français deutsch english |
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 | This DIYs project is a good way to discover the power of the Sun, and the use of a renewable energy to cook without polluting or increasing deforestation. The portable solar cooker uses 3 principles: the greenhouse effect, the concentration of light with reflective panels and the ability of black ... »
renewable, polluting, deforestation, greenhouse, reflective
| | Note | | | Difficulté | | | Durée | 2h 30 min. | | Date | 15.05.2013 | | Langue(s) | français deutsch english |
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 | The construction of a parabolic solar cooker helps to understand how it is possible to concentrate the solar rays to reach higher temperatures. This technique is used in experimental power plants in California and France. These plants use a field of mirrors that concentrate rays to a single point ... »
parabolic, rays, mirrors, tank, turbines
| | Note |  | | Difficulté | | | Durée | 0h 0 min. | | Date | 15.05.2013 | | Langue(s) | français deutsch english |
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 | This DIYs project helps to understand how the greenhouse effect can be used to trap and increase the heat of the sun. The sun's rays (short wavelengths of visible light) penetrate through the glass of the oven and heat the elements inside. When this heat is reissued as infra-red radiations (longer ... »
greenhouse, trap, rays, wavelengths, penetrate
| | Note | | | Difficulté | | | Durée | 2h 0 min. | | Date | 15.05.2013 | | Langue(s) | français deutsch english |
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 | Building a solar boat helps to understand how photovoltaic solar cells can be used to produce electricity. Toy using solar cells represent often machines that do not exist or which are not logical. It is not uncommon indeed to find toys of helicopters or windmills powered by photovoltaic cells. ... »
photovoltaic, windmills, powered, geneva
| | Note | | | Difficulté |  | | Durée | 3h 0 min. | | Date | 14.05.2013 | | Langue(s) | français deutsch english |
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