Evening Neville,
>> At 12:00 PM 9/12/2008, Neville wrote:
forces. So it's reasonable to state that electrons are flowing from the
negative terminal of your battery, through the wires and load, and back
to the positive terminal. ]
The real question, and when you can answer this one, I will buy
your lunch !
"What difference doe it make" ?
As a simple example...the higher the current, the quicker the
'flow', (forgetting ohms law for the moment)... yes?
I think you forgot temperature and the fact that some current
does not flow the same in all parts of the wire. Higher frequencies,
lower frequencies, and DC current !
Next you need to study Super conductors and absolute zero. <grin>
I doubt that you will ever be able to measure it, or even notice
any difference.
One important thing you are missing.
That is to understand what you need to know and what you do not
need to no.
Some things are important, and others have no effect on the real
world of tinkers and experimenters.
Learning every thing and thinking you understand it, ............
Will put you in the class with the scientists.
Guess what ? Many, if not most, cannot see the forest for the trees.
And yes, I know this from experience.
Wayne
=============================
[However, the *effect* of the voltage pushing your electrons propagates
at close to the speed of light around your circuit, as the pressure
caused by the applied voltage propagates through the cloud of electrons
in the metal.]
Yep, I can picture that from the aforesaid Marshall diagram. The
higher the voltage, the higher 'pressure', the...I think I'll stop
there for the moment.
[As it turns out the *convention* of current flow from plus to minus was
created before they figured out what was actually carrying the current,
and stuck, as tradition often does.]
OK, now we come to the better bit. Traditional thinking, (of old
perhaps), supposes that 'something moves, or travels' in a
particular fashion...up and down, left to right, right to left, over
and under, plus to minus...and so it was 'supposed' this was the
case with electricity 'moving or travelling' from positive to
negative or negative to positive... yes? Sorry, I sort of can't
explain that any better.<g> Electricity being an unknown entity if you like.
[Of course, there are materials other than metals that can carry
current, including semiconductors like they make transistors, diodes,
and integrated circuits with, and, as in our case, water in an
electrolysis cell.]
Now, by this I assume you are referring to current 'travelling' from
a starting point, on one end of a circuit board as an example, and
'travelling' along the 'circuits' to the other end of the board,
'directional' if you like...yes?
[In semiconductors you may have electrons flowing, as in conductors, or
you may need to consider "holes" or the absence of an electron in the
crystal lattice of the material, flowing in the opposite direction.]
Nup, I'll just skip this one for the time being.
Yes the current is still actually carried by moving electrons around,
but for reasons understood by the physicists, materials scientists, and
engineers who design these things, hole current may be important. Hole
current is generally not important to us, however. <grin>
Yeah, I am still picturing the schematic of Marshall...yes? but I'm
skipping the 'hole' thing!
[Now, in water, you may actually have both electrons flowing *and* atoms
or molecules of the solvent (water) or solutes (silver or salt, or
whatever) flowing in different directions...]
Now don't anyone freak out here but in my language this would
be...'electricity travelling' between the two electrodes, but in
combination with silver, water molecules and any impurities which
may be in the water which would be affected by the 'electricity',
and these molecules etc would be 'drifting' in the
water...yes? Stay with me here if you can, I'll get proper
terminologies down better later on.
Electrons will still flow from your battery's negative terminal,
through the wire to the negative electrode, through the water to your
positive electrode, then back through the wire to the battery positive
terminal.
Yes, I know what's happening there now, but now we are talking of
'direction' again, from negative to positive. This was my
suggestion some time ago when I said I had read that 'electricity',
or 'current', is 'pushed' so to speak, out from the negative and
returned through the positive. See what I mean? Or is it that we
don't use the 'positive and negative' terminology when water is the
electrical current transfer medium...circuit boards require
'direction' if you like whereas water just 'completes' a circuit
with no particular 'direction'. Like my analogy of a stop valve in
the clock circle, or water pipe circle, the current is apparent when
the valve is opened, but not apparent when the valve is
closed...hence, the positive and/or negative terminology is not used
in this case...yes? Be patient!
<snip, snip, snip>
That will be enough for now I think.
N.
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