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When you turn the tap on, the flowing water spins a turbine that generates electricity to activate a spotlight over the sink. If anything its free.
Turbine in shower head
http://www.showerstar.net/energy.html
You mean like this? [ConsulFlaminicus, Oct 04 2004, last modified Oct 21 2004]
Bathtub Hydroelectric Generator
http://www.halfbake...lectric_20Generator
Sorry, redundant, too. Am I the only one that remembers these? [FarmerJohn, Oct 04 2004, last modified Oct 05 2004]
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Not sure if a conventional spotlight is possible. A 1~4 watt LED should do. |
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There is nothing free about this. The energy gets into the water stream by pumping; someone pays for it. The turbine and generator will cost if they are to power any kind of a light bulb, and they would be usefull for only the brief time that the tap is running. You will find if you calculate that the amout of power availiable from that volume of flow is minute. |
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this is a fully baked idea. i would try to post link for suppliers for such domestic units. |
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Not free. But recovered energy that would otherwise be lost. |
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There is a product out there, which does exactly this. It fits onto a cold water outlet in the tank in your loft, with a chargable battery, which powers a small light. So whenever you go into the loft theres a light to use. |
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