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For more on marking an answer as the "Best Answer", please visit our FAQ.The main problem would be that your body is good at earthing electricity, but doesn't generate enough itself to power something like a watch.
As mentioned there are kinetic watches which have been around for many, many years and those work by translating the body movement into I assume a spring which slowly unwinds. In theory you could even have a kinetic digital watch I suppose.
I was told recently that before touching anything inside your computer. You've to touch the metal casing. This 'Earths' you. Important, as you can carry 300 volts of static. Enough to 'fry' the processor.
But I'm not sure if you can run a watch on 'static' electric.
Sorry Potterfan's Dad... Close, but no cigar.
Very true Mudman - actually it'll fry quite a few chips including all those based on CMOS technology. Can't remember why those are the most sensitive, but when you hit something that expects 5 volts with 300v it tends to complain quite a bit.
300v won't actually do anything on it's own. You need a reasonable number of amps as well which can then translate into the wattage and make things move. I suspect that static amps are generally measured in miliamps which might be enough to run a tiny mechanism, but probably not.
However potterfan3 - it's an interesting theory so I'd give you dad 8/10 for ideas, but maybe 2/10 for practicality.
How stuff works explains more:
http://science.howstuffworks.com/electricity3.htm
do i turn the toaster on and off with the fork in or out? or should i use a knife?
i've seen a lady in a cafe go to do this and i couldn't convince her that even when the plug was switched off it was still dangerous, it took an electritian (?) to persuade her to pull the plug out! i think she survived.
I havent read all the threads but here is some stuff on watches which dont need winding/batteries(?).
1. there is a old (>100yrs) style clock wich wound itself up by using the changes in atmosopheric pressure to keep going, apparently you never needed to wind it (assuming you lived where there were lots of changed in atm press, ie UK)
2. there is the 'kinetic' watch which used the motion of the watch to wind it (see above).
3. there is the solar powered watch.....nuff said
4. there is a device called a thermoelectric generator wich uses heat insead of light to generate electricity. They are relatively expensive, but probably about as efficient as the old solar powered ones - I recon you could run a watch off the bodies heat using one, probably cost a bomb though.
There is no way you would generate enough power, volts yes power no, to run a watch and be able to look normal, touch electrical items etc. Furnther more static is staic, it doesnt move so you would only have the power generated at the watch wrist contact, not much there I think!
Hamish