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 ?
In experiments with absolute intensity measurements, it was necessary to detach the recording electrodes and move the preparation so the optometer detector could be placed in the same position as the preparation.
It is important to point out that many of the first surface EMG studies intentionally placed the monopolar recording electrode over the motor point of the muscle (i.
The minimum value of the F wave latency, related to demyelination in all segments of the nerve from stimulating electrode to spine and back to the recording electrode, were calculated over a series of 20 stimuli.
However, advantage of the spherical system, supplied with the reduced number of the recording electrodes, was a symmetrical distribution of local potential extrema (maxima and minima) with regard to the center of the sphere displaying the thorax surrounding the heart.
The recording electrodes were fixed to the subject's skin using adhesive tape.
For orthodromic sensory conduction of median nerve, surface recording electrode was placed 3cm proximal to the distal wrist crease and a reference electrode at 3cm proximal to recording electrode.
A semi-logarithmic plot of the amplitude of hyperpolarization against the distance between the current and the recording electrode shows the amplitude decreasing linearly with the distance [ILLUSTRATION FOR FIGURE 5B OMITTED].
When the recording electrode is implanted within the tissues of the ampullary cluster, and the voltage drop along the length of the receptor is measured by moving the reference electrode to various locations around the animal's epidermis, a similar decrease in voltage with distance from the electric organ was observed, although the polarity of the recorded EOD was reversed.
A brain-computer interface with recording electrodes under his skull and a functional electrical stimulation (FES) system activating his arm and hand reconnect his brain to paralyzed muscles.
The recording electrodes for the VEP are shown in red.
Inactive recording electrodes of the 3 channels were placed on Fz position on the scalp.

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