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anode

Contributor(s): Matthew Haughn

An anode is the electrode in a polarized electrical device through which current flows in from an outside circuit.

Conversely, a cathode is the eletrode in a polarized electrical device through which current flows out. Cathodes get their name from cations (negatively charged ions) and anodes from anions (positively charged ions).

In a device that consumes electricity, the anode is the charged positive electrode. Such devices include diodes, electrolytic cells in hydrogen production, and secondary battery cells in recharging batteries. However, in a device that produces power, the anode is the negative terminal, due to the flow of electrons being reversed. Such devices include electrolytic cells in hydrogen production, vacuum tubes, cathode ray tubes, oscilloscopes and primary battery cells (this includes all non-rechargeable batteries).

In many applications, since the anode releases electrons to produce current, it gradually breaks down due to the weakening of the bonds between the cathode’s atoms.

Demonstration of cathode and anode in a battery:

This was last updated in June 2014

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