Mark Wonsil writes:

> Of course one has to ask, "Can we produce a constant current in this 
> method?" 
> 
> I don't think so. However, the idea of generating electricity by moving 
> water is not impossible. Some think that by pushing water through really 
> small tubes they can produce enough electricity to someday power small 
> electronics.
>  
>  http://physicsworld.com/cws/article/news/18446

On the other hand, you can produce a great deal more constant current by 
pushing water through really large tubes:

   http://www.usbr.gov/power/data/sites/glencany/glencnyn.jpg

Wirt Atmar

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