[sdiy] 60 Farad capacitors from Korea

[John L Marshall]

Let see if I got this correct. the time constant is: T=RC therefore:

Day/Farad * 1/86400) = Ohms

Oh, now I see where the Faradday applies:-)

Take care,
John

Pacific Northwest Synth Meeting September 25, 2004
----- Original Message ----- 
From: "James Petts" <jpetts at gmail.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, February 22, 2005 9:26 PM
Subject: Re: [sdiy] 60 Farad capacitors from Korea


> 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
>> > >
>> >
>> >
>>
>