I’m looking through the “Gifts for Dads” section on ThinkGeek.com, and I’m quite disappointed.
Every product looks good when they talk about it in the description, but when I do some research on it, I find it’s not quite what they claim.
So buyer beware! Even (or ‘especially’) ThinkGeek.com uses marketing tricks to make things sound better than they are.
First, I looked at the Cold Heat Soldering Tool. It sounds great, but then you read the reviews on Amazon.com.
The way this thing works, from what I observed, is there is 2 parts to the tip. The 2 parts act like an anode and cathode, and the way the tool is “activated” is when you short the anode and cathode with a piece of conductive metal, which is supposed be your solder. When this happens the tool sends high current though the solder causing it to heat up and melt. It’s very similar to welding; you can even see a spark when you short the 2 parts of the tip out.
Problem is that the normal way of soldering circuitry to a board, where you put the tip to the parts you want joined and feed solder to them doesn’t work with this tool. And when you work it the way they want its shotty at best. It doesn’t live up to its name of COLD HEAT ether, the tip is a hot as a normal iron after a bit of soldering.
I guess this would come in useful if you are in a situation where you have no access to a wall outlet and/or can’t use a conventional soldering iron. But even then I would use a butane soldering iron. This thing is useless.
Indeed, every tip has two sides to it, two parts that need to come in contact with the solder.
To be fair, ThinkGeek.com does not lie. They do not present any false information.
But they do leave out details. Important, but negative details.
Next, I checked out the Water Powered Clock. Turns out that -
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.
When the zinc is gone, the power is gone. But the clock draws so little power that it can run for years on that little bit of zinc. However, the water is not the source of the energy.
ThinkGeek claims: “The internal converter simply extracts electrons from water (or other liquid) molecules and provides a steady stream of electrical current acting as a fuel cell to generate power to the clock.”
I’m not sure if this is a definite and absolute lie. But it very well could be.
Now, the vast majority of people don’t do as much research as I do before every purchase. So it’s got to be interesting what you can get people to buy.
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» Tap water in the U.S. is amazingly good
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Hey there, just wanted to say thanks for this entry. Knew the water powered clocks were fishy but can’t find much about them on google other than places selling them.
Plain ol potential difference of two metals joined by a conducting fluid.
I smelled a rat the moment I saw one of these water clocks (which would be half an hour ago)… I saw they use a “special” water battery, although I couldn’t find anywhere to allay my suspicions until I found this nice little blog - nice one.
I remember as a kid an old 1950’s kid’s physics book - at a time when they knew how to write physics texts for children without dumbing down to the level of a single-celled ameba, one of the first things it gives you as a task is to build your own battery out of coins - possibly with threepence and halfpennie coins in an alternating stack, and water - the importance being the former was zinc rich and the latter copper rich. Sadly I didn’t have old coins, and could never find out what coins had good ratios, since most modern coins have the copper content reduced. Anyway… the principle is as old as time, as you rightly say, water is only the conducting medium, and not the source of power…
The method has been employed in self-galvonising steel-hulled ships practically since their begining, protecting by use of zinc blocks attached to the hull, which through the electrovaic potential set up in the sea water attracts anodic zinc to cathodic steel, and thus plates zinc over any exposed steel to inhibit corrosion.
thank you very very much I was almost going to get it