PDA

View Full Version : Physics geeks, answer my simple question


HelloKitty
23-02-2005, 21:42:02
for the life of me I cannot recall why the definitions for cathode and anode are different when refering to an electrode vs a battery terminal.

ex cathode is the pos terminal of a batt but the neg of an electrode.

OMG WTF?

Christoph
23-02-2005, 21:46:48
Anode +ive
Cathode -ive

KrazyHorse@home
23-02-2005, 21:47:29
I DON'T KNOW EITHER. IT'S FUCKING ANNOYING AS SHIT.

My roommate and I were just discussing this. My theory is that it has to do with the initial confusion over whether current flow was composed of positive or negative charges.

KrazyHorse@home
23-02-2005, 21:47:54
Originally posted by Christoph
Anode +ive
Cathode -ive

Not always.

zmama
23-02-2005, 21:48:22
Ah

it depends


HARR HARR HARR

Christoph
23-02-2005, 21:49:21
From what i've experienced it was.

But meh, i think it could be what the current is flowing through that has to do something with it.

HelloKitty
23-02-2005, 22:05:59
"The confusion that naturally arises in the context of the poles of a
battery comes from the fact that it depends on which side of the battery
you look.

Inside a battery, electrons are provided by the cathode, a metal or
compound that readily gives up its electrons. These electrons migrate
through the battery solution towards atoms which become reduced.

Seen from outside the battery, the cathode is positively charged, because
a reduction is occurring at that electrode whereby it is loosing
electrons to the battery solution. This is how batteries work, through
reduction and oxidation of the chemicals inside the battery."

So - the cathode is the terminal that tends to give up electrons...most
often, this means that the cathode is the negative terminal. However, in
a battery, giving up electrons leaves the terminal with a net positive
charge.

Christoph
23-02-2005, 22:07:16
3 letters

T F W

zmama
23-02-2005, 22:10:05
Oh little boy...you ain't seen wordy yet. That was short, sweet and to the point. Wait until Darkstar and Satsuma go at it.

HelloKitty
23-02-2005, 22:12:50
I will cut it down.

POWER GOOD!

Japher
23-02-2005, 22:13:10
"An electrode in an electrochemical cell is referred to as either an anode or a cathode, words that were also coined by Faraday. The anode is defined as the electrode at which oxidation occurs, and the cathode is defined as the electrode at which reduction occurs. Each electrode may become either the anode or the cathode depending on the type of reaction occurring in the cell."

So, I guess "depends" is the proper answer.

Christoph
23-02-2005, 22:14:21
Ooooh, electrodes...

Japher
23-02-2005, 22:16:24
Shocking!!

Darkstar
23-02-2005, 23:47:19
Cool.

----
Chris Top, there's also Ash and Sleeper make for long threads. Ash and DevilH.... And Sleeper and any scientist can make for long threads.

Then there's the occasional madly out of control Koshko threads. Those are truly scary!

MoSe
24-02-2005, 12:27:48
I see I've totally lost my rep here! :(

Funkodrom
24-02-2005, 12:28:25
You should have reped the forum better.

MoSe
24-02-2005, 12:28:35
I'll repair it writing An Ode to Elektra :p

zmama
24-02-2005, 14:34:39
nooooooooooooooo dear lord noooooooo

Darkstar
24-02-2005, 22:19:43
MoSe, you are the chart man. The person that collects up the data, and makes the invisible apparent to the unwashed masses. You're a prophet, and like all prophets, hated and unwelcome in your own land.



Happy now? :D

HelloKitty
24-02-2005, 22:21:23
He also has a great anal fisting avatar.

MoSe
25-02-2005, 12:47:38
Originally posted by Darkstar
Happy now? :D

I never felt so loved and understood!
:love: