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Hello David,

At The Tech Museum, we developed a working prototype for a wave tank buoy
that generates enough electricity to light a couple of high-zpower LEDs.
The device integrated the idea of those shake flashlights (magnet moving
through a coil of wire to generate electricity) into a miniature buoy (about
2in diameter).  

We used larger magnets, finely wrapped coils, and a rectifying circuit, to
light a couple of high-power LED's from the slow 0.5-1Hz motion of a wave.

From there, you could have a put together table to have visitors build their
own shake generator by swapping out magnets, coils, etc... (well, maybe not
untethered magnets...)

-Eric

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Eric Yuan
Exhibit Developer
Children's Museum of New Hampshire
6 Washington St
Dover, NH 03820
(603) 742-2002
www.childrens-museum.org 
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