electrode

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electrode,

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. For example, 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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 current passes through a liquid electrolyte; in a fluorescent lamp current passes through a gas. An electrode is usually in the form of a wire, rod, or plate. It may be made of a metal, e.g., copper, lead, platinum, silver, or zinc, or of a nonmetal, commonly carbon. The electrode through which current passes from the metallic to the nonmetallic conductor is called the anode, and that through which current passes from the nonmetallic to the metallic conductor, the cathode. (Electron flow is in a direction opposite that of conventionally defined current.) In most familiar electric devices, current flows from the terminal at higher electric potential (the positive electrode) to the terminal at lower electric potential (the negative electrode); therefore, the anode is usually the positive electrode and the cathode the negative electrode. In some electric devices, e.g., an electric battery, nonelectric energy is converted to electric energy, causing current to flow within the device from the negative electrode to the positive electrode, so that the anode is the negative electrode and the cathode is the positive electrode.

Electrode

 

a structural component of an electronic, ion, or electrical engineering device or production apparatus. It consists of a conductor with a specific shape, which connects a section of an electric circuit in contact with a working medium—a vacuum (in the practical sense), gas, semiconductor, or liquid—to the remainder of the circuit (which is formed by conductors).

The electrodes of electronic devices (electron tubes, electronbeam instruments, semiconductor devices, and so on) are usually in the form of a plate, grid, cylinder, or the like. They have a wide variety of functions. For example, as cathodes and photocathodes, they act as sources of electrons; as grids (control, shield, and suppressor types) and the electrodes of electron guns, they are used to create within a device electric fields that control the motion of electrons and ions in the working medium; as anodes (plates), they collect electrons.


Electrode

 

in electrochemistry, a metal, oxide, or other electrical conductor in contact with an ionic conductor, such as an electrolytic solution or a fused electrolyte. The most important characteristic of electrodes is the electrode potential established at the electrode-electrolyte boundary. Depending on use, electrodes may be classified as reference, indicator, and other types. Systems of two different electrodes can be used as chemical sources of current; when direct current passes through such systems, they act as electrolytic cells.

electrode

[i′lek‚trōd]
(electricity)
An electric conductor through which an electric current enters or leaves a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum.
One of the terminals used in dielectric heating or diathermy for applying the high-frequency electric field to the material being heated.

electrode

1. In arc welding, the component in a welding circuit through which an electric current is conducted between the electrode holder and the arc.
2.In resistance welding, the component through which the electric current in the welding machine passes (usually accompanied by pressure) directly to the work.

electrode

1. a conductor through which an electric current enters or leaves an electrolyte, an electric arc, or an electronic valve or tube
2. an element in a semiconducting device that emits, collects, or controls the movement of electrons or holes

electrode

A device that emits, controls or receives electricity. Typically an end point or wire made of metal or some composite material, there are countless electrodes in electrical and electronics products. For example, in a vacuum tube, the cathode emitter is a "negative" electrode. The transparent wires made of indium-tin-oxide (ITO) that cross an LCD screen are electrodes. See battery, air interface and cathode.
References in periodicals archive ?
Electrodes 10-point diagnostic for CS controllable - 170 pcs.
Medical electrodes are mass products and in most of the cases represent a sub segment or portfolio of medical device manufacturers with very little scope for product differentiation.
The battery had one silicon electrode and one lithium metal electrode, both contained in a bath of electrolyte.
The roughing cycle is far faster than anything we've seen before, and with the tool-changer we can maximise lights-out usage," said Parsons, who says the use of VISI Electrode means Alliance has electrodes ready before it needs them.
To gain insight into the charge-transfer and catalytic properties of the PANI counter electrodes, the EIS analysis was earned out with the symmetric cell consisted of two identical PANI electrode with 5-[micro]m thickness and Pt electrode, respectively.
For redesigned electrodes the CAM program will be automatically generated and their execution will be carried through the processing center.
It should be noted that formation of descending flows near electrodes of the current-leading section occurs during cladding not in the area of transition from the current-leading to the middle (dividing) section near lower boundary of the electrodes, as in modeling of the ingot melting process, but at a certain distance from surface of the solution.
In lab tests, electrodes made of the platinum-nickel alloy are about 10 times as active chemically as ones made of pure platinum and about 90 times as active as the platinum-carbon electrodes now used in state-of-the-art fuel cells, the researchers report online for an upcoming issue of Science.
Electrode site preparation techniques: a follow-up study.
If Geobacter could transfer electrons to electrodes as fast as it can to its natural electron acceptor, ferric iron, the rate of electron flow--that is, the current--could possibly be ten thousand times higher," says Lovley.
Graphite electrodes are used mainly in electric-arc furnaces that melt scrap steel for recycling.
PS-Electrode users can quickly and easily define the region where the electrode will be needed, create the shape needed to produce the required feature ill the part, extend these surfaces to provide clearance from the main surface of the tool, and blend them into the shape needed to fix the electrode in its holder.