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The most important electronics terms, demystified in one place.


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The side of a diode that is p-doped, or the p-region. By standard notation, this is generally considered the “positive” side of a diode, except with Zener diodes, which are backwards.

Book Definition

The p region of a diode.

Electronic Devices : Conventional Current Version, 9th Edition by Thomas L. Floyd

The p side of the diode is called the anode

Grob’s Basic Electronics, 11th Edition by Mitchel E. Schultz


An anode is an electrode through which the conventional current enters into a polarized electrical device. This contrasts with a cathode, an electrode through which conventional current leaves an electrical device. A common mnemonic is ACID, for "anode current into device".[1] The direction of conventional current (the flow of positive charges) in a circuit is opposite to the direction of electron flow, so (negatively charged) electrons flow out the anode into the outside circuit. In a galvanic cell, the anode is the electrode at which the oxidation reaction occurs.

An anode is also the wire or plate having excess positive charge.[2] Consequently, anions will tend to move towards the anode.

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