what is electrode?

Answer 1

(m)

An electrode is an electrical conductor used to make contact with a metallic part of a circuit (e.g. a semiconductor, an electrolyte or a vacuum). The word was coined by the scientist Michael Faraday from the Greek words elektron (meaning amber, from which the word electricity is derived) and hodos, a way

Answer 2

An electrode is an electrical conductor used to make contact with a metallic part of a circuit

OR
An electrode is a conductor through which electric current is passed. Found in variable forms, electrodes may be wires, plates, or rods. An electrode may be constructed of metal, such as copper, silver, lead, or zinc. However, an electrode may also be made of a nonmetal substance, such as carbon.

An electrode passes current between a metallic part and a nonmetallic part of an electrical circuit. Most frequently, conductors that are metallic carry electrical current. In other circuits, however, current is passed through a nonmetallic conductor.

In an electrochemical cell, an electrode is called either an anode or a cathode. An anode is an electrode at which current leaves the cell and oxidation takes place. For example, an anode is the positive electrode in a storage battery.

Answer 3

An electrode is a conductor through which electric current is passed. Found in variable forms, electrodes may be wires, plates, or rods. An electrode may be constructed of metal, such as copper, silver, lead, or zinc. However, an electrode may also be made of a nonmetal substance, such as carbon.

An electrode passes current between a metallic part and a nonmetallic part of an electrical circuit. Most frequently, conductors that are metallic carry electrical current. In other circuits, however, current is passed through a nonmetallic conductor.

In an electrochemical cell, an electrode is called either an anode or a cathode. An anode is an electrode at which current leaves the cell and oxidation takes place. For example, an anode is the positive electrode in a storage battery

Answer 4

An electrode is an electrical conductor used to make contact with a metallic part of a circuit (e.g. a semiconductor, an electrolyte or a vacuum). The word was coined by the scientist Michael Faraday from the Greek words elektron (meaning amber, from which the word electricity is derived) and hodos, a way.[1]

Contents [hide]
1 Anode and cathode in electrochemical cells
1.1 Primary cell
1.2 Secondary cell
2 Other anodes and cathodes
3 Welding electrodes
4 Alternating current electrodes
5 Types of electrode

[edit] Anode and cathode in electrochemical cells
An electrode in an electrochemical cell is referred to as either an anode or a cathode, words that were also coined by Faraday. The anode is now defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs. Each electrode may become either the anode or the cathode depending on the voltage applied to the cell. A bipolar electrode is an electrode that functions as the anode of one cell and the cathode of another cell.


[edit] Primary cell
A primary cell is a special type of electrochemical cell in which the reaction cannot be reversed, and the identities of the anode and cathode are therefore fixed. The anode is always the negative electrode. The cell can be discharged but not recharged.


[edit] Secondary cell
the case in an electrolytic cell. When the cell is being discharged, it behaves like a primary or voltaic cell, with the anode as the negative electrode and the cathode as the positive.


[edit] Other anodes and cathodes
In a vacuum tube or a semiconductor having polarity (diodes, electrolytic capacitors) the anode is the positive (+) electrode and the cathode the negative (−). The electrons enter the device through the cathode and exit the device through the anode.

In a three-electrode cell, a counter electrode, also called an auxiliary electrode, is used only to make a connection to the electrolyte so that a current can be applied to the working electrode. The counter electrode is usually made of an inert material, such as a noble metal or graphite, to keep it from dissolving.


[edit] Welding electrodes
In arc welding an electrode is used to conduct current through a workpiece to fuse two pieces together. Depending upon the process, the electrode is either consumable, in the case of gas metal arc welding or shielded metal arc welding, or non-consumable, such as in gas tungsten arc welding. For a direct current system the weld rod or stick may be a cathode for a filling type weld or an anode for other welding processes. For an alternating current arc welder the welding electrode would not be considered an anode or cathode.


[edit] Alternating current electrodes
For electrical systems which use alternating current the electrodes are the connections from the circuitry to the object to be acted upon by the electrical current but are not designated anode or cathode since the direction of flow of the electrons changes periodically, usually many times per second.


[edit] Types of electrode
Electrodes for medical purposes, such as EEG, ECG, ECT, defibrillator
Electrodes for electrophysiology techniques in biomedical research
Electrodes for execution by the electric chair
Electrodes for electroplating
Electrodes for arc welding
Electrodes for cathodic protection
Inert electrodes for hydrolysis (made of platinum)

Answer 5

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 electrolysis 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..

Answer 6

An electrically conductive structure in an electrochemical device, such as a fuel cell, which transfers electrons to or from reactant atoms or molecules.
Example :[1] In a spark plug, one electrode (the center electrode) is the center rod passing through the insulator. The side electrode is a rod welded to the shell of the spark plug. The distance between them is the spark gap. [2] In welding it is the metal rod that is used in arc welding. A substance which brings electricity up to the point where the arc is to be formed; in other words it is the material immediately adjacent to the arc proper and the one which carries the current to this point. ...

Answer 7

It could have many meanings.

In case of Electro-Plating Technology. There is Anode and cathod. Posetive post of a battery is attached to Anode and negetive post is attached to Cathod.

Both of these will be called Electrodes on the plating equiptment.

Answer 8

Electrodes are metal rods which conducts electricity that helps in dissociation of a solution. They are mainly of 2 types: anode that is +vely charged and is connected to positive side of the battery. Another is cathode that is -vely charged and is connected to negative terminal of the battery. They are used in many purpose in industry, i can't name them. These can be made of any metals.

Answer 9

the metal having ability of gaining or loosing electrons in a electro chemical cell are called electrodes

Answer 10

an electrode is a metal piece or rod immersed in an electrolyte to conduct electricity during electrolysis