[sdiy] 60 Farad capacitors from Korea

[James Petts]

BTW, forgot to mention that a coulomb is the amouunt of charge carried
by 1 amp flowing for 1 second, or about 6.24×10^18 electron charges.
Note that this is *not* Avogardro's number of electrons: that quantity
of charge is called a faraday (not farad).

Knew my electrochemistry PhD would come in handy some time...


On Tue, 22 Feb 2005 21:09:25 -0800, James Petts <jpetts at gmail.com> wrote:
> A farad is the capacitance of a condenser with one electrode having 1
> coulomb of charge, the other -1 coulomb, with a potential difference
> of 1V between the plates.
> 
> 
> On Tue, 22 Feb 2005 23:41:47 -0500, anthony <aankrom at bluemarble.net> wrote:
> >
> >
> > >I tried unsoldering a couple of 2 farad caps from a video recorder, and
> > > every time my soldering iron touched the solder joint I got a dirty great
> > > spark. Investigation proved that it was not electrical (no return path to
> > > start with, and the spark was orange). Turns out these buggers had leaked
> > > and the electrolyte was explosive. Heat it and it goes bang!
> >
> > Wacky.
> > Do you know what it was? If I recall correctly these caps aren't
> > electrolytic even. Some sort of carbon material. Their ESR probably sucks
> > ass, but for what you'd use them for that wouldn't matter at all.
> >
> > OT (sort of) Question to (electro-)chemists out there:
> > Is a Farad equal to the number of electrons that would correspond to one
> > Mole of hydrogen (protons)?
> > Like a quantity of electrons equal to Avogadro's number (which is a big
> > number).
> >
> > If so then 60 Farads would be able to electrolyse 15 moles of hydrogen
> > (gas - H2) which given hydrogen's molar gas volume of 25L, would be 375L of
> > hydrogen gas at atmospheric pressure. (Sorry I had a college flashback)
> >
> > > Ken
> > >
> >
> >
>