cathode

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cathode,

electrodeelectrode,
terminal through which electric current passes between metallic and nonmetallic parts of an electric circuit. In most familiar circuits current is carried by metallic conductors, but in some circuits the current passes for some distance through a nonmetallic conductor.
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 through which current leaves an electric device. In electrolysiselectrolysis
, passage of an electric current through a conducting solution or molten salt that is decomposed in the process. The Electrolytic Process

The electrolytic process requires that an electrolyte, an ionized solution or molten metallic salt, complete an
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, it is the negative electrode in the electrolytic cell.

Cathode

 

(1) In an electron tube or a gas-discharge tube, the electrode that is the source of electrons that ensure the conductivity of interelectrode space in a vacuum or maintain the steadiness of the passage of an electric current through the gas. Depending on the mechanism of emission of electrons, there exist thermionic cathodes, photocathodes, and cold cathodes.

(2) The negatively charged electrode (pole) of a source of current (galvanic cell, storage battery).

(3) The electrode of an electrolytic cell, an electric arc, and other similar devices that are connected to the negative pole of a source of current.

cathode

[′kath‚ōd]
(electricity)
The terminal at which current leaves a primary cell or storage battery; it is negative with respect to the device, and positive with respect to the external circuit.
(electronics)
The primary source of electrons in an electron tube; in directly heated tubes the filament is the cathode, and in indirectly heated tubes a coated metal cathode surrounds a heater. Designated K. Also known as negative electrode.
The terminal of a semiconductor diode that is negative with respect to the other terminal when the diode is biased in the forward direction.
(physical chemistry)
The electrode at which reduction takes place in an electrochemical cell, that is, a cell through which electrons are being forced.

cathode

1. the negative electrode in an electrolytic cell; the electrode by which electrons enter a device from an external circuit
2. the negatively charged electron source in an electronic valve
3. the positive terminal of a primary cell

cathode

The terminal on a device that emits current. In the cathode ray tubes (CRT) of the bulky TVs and monitors prior to flat panels, the negative cathode emits electrons that are attracted to the positive "anode." Current flows out of cathodes and into anodes. Depending on the application, a cathode may be considered positive or negative. Derived from Greek, cathode and anode mean "down" and "up" respectively. See electrode and cold cathode.


Cathode Emitters
In vacuum tubes, the cathodes are the emitters, and the anodes are the collectors.
References in periodicals archive ?
10% of the copper concentrates used by Daye Metal Group for its copper cathode production in those periods, respectively.
Copper Cathodes from newly commissioned facilities, in Democratic Republic of Congo, were successfully produced by Katanga Mining Limited which initiated the Updated Phase 4 Expansion program- expected to be completed in late 2013.
Both Cyprus and Lac, with a team of highly qualified technical and financial advisors, performed extensive studies of the property and submitted a development plan which will lead to the production of 225,000 tonnes per year of refined copper cathodes, with production to begin approximately 39 months after closing.
The ACL project, situated alongside Codelco North Division's low-grade sulphides plant, can process 77,000 tons of copper concentrates and produce 20,000 tons of fine "A" grade copper cathodes a year.
Each alternative commences with crushing, grinding and flotation of sulfide concentrates and continues by 1) direct shipment of the gold-copper concentrates to an off-site smelter, 2) processing of concentrates through a high temperature pressure oxidation (HTPOX) process to produce copper cathodes on-site, and 3) processing concentrates through the Cominco Engineering Services Limited (CESL) process to also produce copper cathodes on-site.
Fluor Daniel also is providing basic engineering as part of a feasibility study to expand production through the manufacture of copper cathodes.
This property, the La Balsa, is in the advanced stage and will produce very pure, high quality copper cathodes.
The production of the LME "A" Grade copper cathodes represents the realisation of another significant step towards the completion of a feasibility study being conducted by PBM to evaluate the viability of building, owning and operating a commercial plant for toll treatment of concentrates and for projects in which PBM may acquire an equity interest.