Solar-Radiometer |
- smallest sun power plant in the world - |
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| The radiometer, also known as a light windmill, is an instructive physical objekt for demonstrating
a theory wich was invented by the English physicist Crooks about 100 years ago.
This small physical and technical miracle shows you in a simple way how this "smallest sun power plant in the world" converts light into energy and how are able to use the sun as a source of ernergy in the future! |
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| How the Solar Radiometer works: |
| When warm light, that is sun light or the light of electric bulbs (but not cold neon light)
strikes the wings resting on a needle in the radiometer bowl they start to turn. Depending on the
power of the light the wings turn at varying speeds. Inside the glass bowl there is a partial vacuum
produced by the air being thinned in order to keep the balance between air resistance and the turning
power of the solar energy. The black surfaces of the wings absorb more light than the white surfaces,
therefor the pressure on the black surfaces is much stronger than on the white surfaces. The more the
molecules in the bowl heat up, the stronger the pressure on the black surfaces and the wings start to
turn steadily (Molecular theory of Brown).
Depending of the power of the light a rotation of 3000 revolutions per minute can be reached by the radiometer which is a technically interesting and amusing article for the modern home. |
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All our Solar Radiometers and many more you can find it by eBay : |
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