Electricity from Water: How Does It Work?

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Discussion Overview

The discussion revolves around the operation of a water-powered clock, exploring the underlying principles of how it generates electricity. Participants examine the technology involved, comparing it to other methods of generating power, such as using potatoes.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes a water-powered clock that operates without batteries, claiming it uses fuel cell technology to harness energy from water molecules.
  • Another participant questions the details and expresses interest in understanding the technology better.
  • Several participants argue that the water itself is not the source of power, but rather the difference in electrode potentials between the anode and cathode submerged in the water or other substances like potatoes.
  • One participant suggests that the clock functions similarly to a battery, drawing a small amount of current, and raises the question of what happens when the electrodes dissolve.
  • A participant shares personal experience with a potato clock, noting that the electrodes corrode over time and that the clock stops working due to dehydration of the potatoes rather than a depletion of power from the potatoes themselves.

Areas of Agreement / Disagreement

Participants generally agree that the water is not the primary source of power, but there is disagreement regarding the specifics of how the technology works and the implications of using different materials for power generation.

Contextual Notes

Some assumptions about the technology and its operation are not fully explored, such as the exact chemical processes involved and the longevity of the electrodes in different environments.

chound
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I have this clock which if u fill with water will start working! How dus it work
 
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More details please.
 
This has more details:
http://www.realgoods.com/shop/shop3.cfm/dp/302/ts/4170301


  • Water-Powered Clock or Calculator[/color]
    You won't ever have to buy any batteries or plug in any cords to use this LCD clock or calculator. Both work using nothing more than ordinary water. The secret is a patented revolution in fuel cell technology that harnesses the energy of water molecules to provide a futuristic stream of pollution-free electrical current. Just pull out the two tiny reservoir tubes from underneath the clock's sleek arch, fill them from your tap, and amazingly! you'll have enough power for two months of operation.
 
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Very amusing. New to me. If anyone has more details I'd be interested in the particulars.
 
I had one of these once, though it used potatoes instead of water.

The water isn't the source of the power. The electricity is being produced by the difference in electrode potentials of the anode and the cathode which are inserted into the water (or potato). It's just a battery, it looks a little bit different, but the clock draws a very small amount of current anyway.
 
brewnog said:
The water isn't the source of the power. The electricity is being produced by the difference in electrode potentials of the anode and the cathode which are inserted into the water (or potato). It's just a battery, it looks a little bit different, but the clock draws a very small amount of current anyway.
So its powered by a dissolving hunk of zinc? That was my guess too...

What happens when that is gone?
 
Takes a while. My Potato Clock had (zinc and copper? maybe?) electrodes, they were probably about 4 grams each, and the only noticable change I could see was some slight surface corrosion on the zinc. I ran it for about a year before I got bored and took it to bits...

After a few weeks, it stops working, so you change the potatoes and it works again. Of course, this is just dehydration of the potatoes, but fraudsters will tell you it's because the potatoes are the power source.
 

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