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What is an anode?

What is an anode? Here are some definitions.

Noun
  1. (electricity) An electrode, of a cell or other electrically polarized device, through which a positive current of electricity flows inwards (and thus, electrons flow outwards). It can have either a negative or a positive voltage.
  2. (chemistry) The electrode at which chemical oxidation of anions takes place, usually resulting in the erosion of metal from the electrode.
  3. (electronics) The electrode which collects electrons emitted by the cathode in a vacuum tube or gas-filled tube.
  4. (electronics) That electrode of a semiconductor device which is connected to the p-type material of a p-n junction.
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Meanwhile, copper atoms in the positive anode give up electrons and dissolve into the electrolyte solution as copper ions.
However, the sodium channel inactivation gates are open in the hyperpolarized virtual anode region, causing the tissue to be excitable.
At one electrode, the anode, molecules of hydrogen gas break down into electrons and positively charged hydrogen ions.
In chemistry the most common use of the term anode occurs in electrochemistry.
Such an anode body may be used to be filled in the liquid electrolyte in the container to make a capacitor.
The fuel cell also needs moisture in the electrolyte as well as water at the anode to control the supply of methanol.

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