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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.



(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.


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.
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.


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


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 ?
In 2014, total copper cathode output from continuing operations was 84,000 tons.
2 kt of copper cathode in 2014 which was 4% below the levels in the prior year and 5.
30/lb of copper produced, and 12,000 tonnes of copper cathode from the SXEW plant.
The Muliashi Project has a designed production capacity of copper cathode of 40,000 tonnes per annum.
By the end of 2008, the Group's production capacity of copper cathode has exceeded 800,000 tonnes per year; by-products like gold, silver and sulfuric acid have also experienced remarkable increases in the production capacity.
45000 tons of copper cathode and 3500 tons of contained cobalt is expected to
It's the refining of that anode to copper cathode which then goes to market, we're looking at right now.
Historically Codelco has minimized use of the Damiana deposit, which produces on average 25,000 tons of fine copper cathodes each year;
The London-listed company produced 294,000 tonnes of copper cathode equivalent in 2013.
The plant is expected to produce 25,000 tonnes of copper cathode in its first full 12 months of operation and 50,000 tonnes per annum in subsequent years.
PT Smelting Gresik predicted its profit will shrink to less than US$30 million this year from US$40 million last year on falling price of copper cathode.
Fortunately for domestic wire choppers, some domestic copper scrap consumers are limited in their ability to use copper cathode, so they have been paying above-market prices for copper wire chops.