Re: Anode and Cathode confusion?


"WAYNEL" <home@xxxxxxxxxxxxx> wrote in message
news:1167758580.550409.151600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Can any one give a good explanation that is not so confusion concerning
the anode and cathode, relating to rechargable batteries and cells.


At the cathode of a cell you get a reduction and at the anode you get
oxidation.
Electrons flow into cathode of the cell and thus produce a high
alkiline around the electrode, OH-.
Although on a Porbaix diagram the most negative side has a H+?

In electronics the cathode is negative and the anode in positive and
electrons travel from negtive to positive therefore the positive
(anode), when charging, will connect to the to the cathode of the
battery and cathode to anode of a battery???

Cheers

WayneL

A cathode gives off electrons and an anode collects electrons inside the
device. In a battery the anode becomes the most negative because the
collected negative electrons become available to the external circuit. From
outside of the battery the electrons flow from the negative anode through
the circuit to the positive cathode. Inside the battery the electrons leave
the cathode into the ionic reactions of the battery but wind up flowing to
the anode. The anode is negative and the cathode is positive. To charge a
battery the flow direction but not the polarity is reversed. This is done by
using a higher charge voltage than the batteries natural voltage, forcing
the current in the opposite direction.

In an electronic device such a s vacuum tube, the cathode inside the device
also gives off electrons and the anode collects them. But, the flow of
current does not occur as it does in a battery until a voltage is placed
across the device to force the current flow. To make the electrons flow to
the anode, it is made positive with respect to the cathode. The anode would
not naturally be positive without an external voltage making it so. I'm sure
this is all clear as mud!






.

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