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Friday, March 02, 2007

Amazing Water-Powered Battery Demonstration

After watching the clip, can anyone here explain how this thing works?



I know the theory behind the battery must have something to do with the generation of static electricity, but since there is no contact between the cans of paint and the water, I fail to see how this whole phenomenon can actually happen.



1 Comments:

  • I'm assuming polarities here, they could be reversed. The pails initially have some exceedingly small amount of charge, from any sort of environmental phenomena, not much, but there's some.

    Starting at the bottom pails, pail C has a positive charge, pail D has a negative charge. Since C is connected to can A, can A is also charged positively. Same for B, it's negatively charged since it's connected to D.

    The water dripping through positively charged can A assumes a negative charge where it breaks into drips from the nozzle, because opposite charges attract. These negatively charged drips fall into can C, increasing it's negative charge.

    The water dripping through negatively charged can B assumes a positive charge where it breaks into drips from the nozzle, again, because opposite charges attract. These negatively charged drips fall into can D, increasing it's positive charge.

    As the charges on C and D increase, the voltage on cans A and B increases, which increases the charge on the dripping water, which increases the rate that the charge is added to pails C and D. It's a cascading, or amplifying effect. Eventually, the charge increases enough to spark across the metal spheres.

    As the charges increase, the water is shown to start spreading out from a straight stream of water into a cone shape. This is because the water and the pail it is falling into have the same charges, and these like charges repel each other.

    The energy comes from the work done by gravity on the water falling.

    This device is called Kelvin's Thunderstorm, or a Kelvin water dropper.

    By Blogger Craig, at 9:28 PM  

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