| Topic: |
Science > Physics |
| User: |
"DARTH VADER" |
| Date: |
11 Sep 2005 03:01:33 AM |
| Object: |
Potential!!!!!! |
In a cell we say that the +ve is at high potential and the -ve is at a
low potential .What does it actually mean ?
I mean what does high potential mean ? And why is it "high" potential
and how is it created in a cell ?
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| User: "PD" |
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| Title: Re: Potential!!!!!! |
12 Sep 2005 01:51:55 PM |
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DARTH VADER wrote:
In a cell we say that the +ve is at high potential and the -ve is at a
low potential .What does it actually mean ?
I mean what does high potential mean ? And why is it "high" potential
and how is it created in a cell ?
What it means is that a positive charge at the +ve terminal has higher
potential there than it will have at the -ve terminal.
Look up "oxidation-reduction reactions" and the electrochemistry
chapter in your nearest introductory chemistry text.
PD
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| User: "Gregory L. Hansen" |
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| Title: Re: Potential!!!!!! |
11 Sep 2005 10:04:22 PM |
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In article <1126424997.177651.117160@g47g2000cwa.googlegroups.com>,
DARTH VADER <ullalvarun007@hotmail.com> wrote:
In a cell we say that the +ve is at high potential and the -ve is at a
low potential .What does it actually mean ?
I mean what does high potential mean ? And why is it "high" potential
and how is it created in a cell ?
The electric field is the gradient of the potential. In a wire of length
L with uniform resistance and a voltage V applied between the ends, and
ignoring the effects of points and sharp corners, the electric field
inside is E=V/L. The potential tells you how much energy a free electron
would gain in travelling from one end to the other. E.g., for a potential
of 9 volts, an electron would gain 9 electron volts. (But an electron
inside the wire is not free.)
Instead of saying potential, say "potential difference". A 9 volt battery
has a potential that's 9 volts higher at the positive terminal than at the
negative. We've floated battery operated equipment at 2000 volts, where
the ground of the local circuit is 2000 volts above Earth grond. (And
fiber optics got the signal out.) It didn't matter to the pre-amp that it
was 2000 volts above Earth ground, it just mattered that one of the
battery terminals was 9 volts higher than the other. It's conventional to
define Earth ground as zero volts, but the zero point is arbitrary and can
be made any value. The offset drops out in the difference.
--
"Don't try to teach a pig how to sing. You'll waste your time and annoy
the pig."
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| User: "John C. Polasek" |
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| Title: Re: Potential!!!!!! |
11 Sep 2005 10:14:47 AM |
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On 11 Sep 2005 01:01:33 -0700, "DARTH VADER"
<ullalvarun007@hotmail.com> wrote:
In a cell we say that the +ve is at high potential and the -ve is at a
low potential .What does it actually mean ?
I mean what does high potential mean ? And why is it "high" potential
and how is it created in a cell ?
By cell you mean part of a battery, not?
Cells consist of two different metals (separated by a paste or acid)
that have different electromotive potentials: seen electromotive
series. An electron can "fall off" a high potential metal and make its
way to the other low potential metal but only if you put a wire
between the two metals or even a light bulb. The acid eats the metal
but the reaction only occurs when there is a wire to let the electrons
pass.
At least that's the way I understand it.
John Polasek
http://www.dualspace.net
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