cathode

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Related to cathodic: cathodic polarization

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 ?
Our new DataLogger software works in tandem with our expanding line of FreeWave Cathodic Protection radios.
A key building block to a cost effective, pipeline integrity, corrosion protection program is vital, timely monitoring and reporting of cathodic protection data.
Cathodic protection specialists routinely employ vacuum excavators to access buried metal pipe and other structures in order to install or replace anodes that protect pipe from active corrosion, a natural process that affects all metallic structures.
Corrpro will supply and install cathodic protection systems for existing TransCanada pipelines across Canada.
Cathodic Protection (CP) and Close Interval Potential Survey (CIPS) in ROI, NI and Scotland (onshore) regions.
WHAT: Radio-based Cathodic Protection Remote Monitoring Energy and pipeline companies wrestle to control operating costs largely affected by new government regulations, ageing buried metal assets, rising steel prices, expanding pipeline operations, new interference points, HCA encroachment, restrictive land use policies, heightened network security, and an ageing soon-to-retire work force.
Jay-Brant is pleased to be able to expand the services we offer to the USCG by providing cathodic protection on the cargo wharf by virtue of our contractual relationship with Corrpro.
Together with SGL, one of the world's leading manufacturers of carbon-based products, we aim to develop new cathodic solutions which make further reduction in energy consumption possible, says Johannes Aalbu, Head of Technology development in the Primary Metal business area in Hydro.
A -850mVcse polarized potential criterion, typically measured as an instant-off potential, when the cathodic protection current is interrupted, was included along with the original -850mVcse "current-applied" criterion.
WHAT: Optimizing Operations by Automating Remote Cathodic Protection Systems Energy and Pipeline Companies wrestle to control operating costs largely affected by new government regulations, ageing buried metal assets, rising steel prices, expanding pipeline operations, new interference points, HCA encroachment, restrictive land use policies, heightened network security, and an ageing soon-to-retire work force.
The coatings offer excellent cathodic disbondment results, high abrasion resistance, high adhesion and do not shield cathodic protection.
to supply cathodic protection pit assemblies for the South Jersey Port Beckett Terminal at the Port of Camden, NJ.