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Photovoltaic Windmills Toy
Product Code: SUK-SCHOOL-SSLAB-L131003
Description & Specifications
Photovoltaic Windmills Toy
Technical Specification
Vacuum cleaner Crookes radiometer Photovoltaic windmills Thermal radiator
The vacuum is important to the crookes radiometer's success. If there is
no vacuum (that is, if the bulb is full of air), the vanes do not spin
because there is too much drag. If there is a near-perfect vacuum, the
vanes do not spin unless they are held in a frictionless way. If the
vanes have a frictionless support and the vacuum is complete, then
photons bouncing off the silver side of the vanes push the vanes,
causing them to rotate. However, this force is exceedingly small.
A Crookes' radiometer has four vanes suspended inside a glass bulb.
Inside the bulb, there is a good vacuum. When you shine a light on the
vanes in the crookes radiometer, they spin in bright sunlight, they can
spin at several thousand rotations per minute!
If there is a good but incomplete vacuum, then a different effect called
thermal transpiration occurs along the edges of the vanes, as described
on this page. The effect looks as though the light is pushing against
the black faces. The black side of the vane moves away from the light.
This small physical and technical miracle shows you in a clear way how
sunlight is converted to energy - the sun as an energy source of the
future!
The crookes radiometer has become a technically interesting and
entertaining object of modern living spaces and shows you at the window
standing or hanging, every ray of sunshine through movement.
Vanes in the Radiometer are alternately dark and light in color
Vanes transfer heat to each one but not at the same degree
Lighter vane reflects the rays and the darker vane absorbs the rays
For ages 7 and above
1. Material of glass
2.Lightweight impeller
3.Super quality and reasonable price.
4.The light radiation the faster and stronger speed