cathode
IPA: kˈæθoʊd
noun
- (electricity) An electrode, of a cell or other electrically polarized device, through which a positive current of electricity flows outwards (and thus, electrons flow inwards). It can have either a negative or a positive voltage with respect to anode of the same polarized device (depending on whether the device is a load or a source, respectively).
- (chemistry, by extension) The electrode at which chemical reduction of cations takes place, usually resulting in the deposition of metal onto the electrode.
- (electronics) The electrode from which electrons are emitted into a vacuum tube or gas-filled tube.
- (electronics) That electrode of a semiconductor device which is connected to the n-type material of a p-n junction.
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Examples of "cathode" in Sentences
- The cathode is the negative electrode.
- Copper is the cathode and zinc the anode.
- An envelope encloses the dynodes and the cathode.
- The cathodes of the cell alternate with the anodes.
- The anode is disposed in the cell above the cathode.
- In this case copper is the cathode and zinc the anode.
- The cathode and the focus electrode are interconnected.
- The nozzle is the cathode, and the electrode is the anode.
- The nature of the new cathode is proprietary at this time.
- The anode is positioned to face the opening of the cathode.
- It's hard to remember now, but in the olden days TV sets and computer monitors used a technology called cathode ray tubes.
- Most batteries are packaged with both the positive electrode (called the cathode during discharge) and the negative electrode (the anode).
- The same or similar values for the ratio mentioned above have been found for the negative particles with which we are concerned in cathode rays.
- For one thing, the free-moving electrons, with which we are concerned in cathode rays and in some types of Becquerel rays, give rise to many interesting problems.
- The only difference between these two cells was that in Lenard's cell the electrons were taken from the cathode by light, whereas on the "3-electrode lamp" the cathode is a white-hot filament capable of sending into the vacuum currents of much higher intensity.
- In the preface to his book he expressed his intention to relate chemical research to industrial processes and in the same year he reported the results of his work on electrolytic oxidation and reduction, in which he showed that definite reduction products can result if the potential at the cathode is kept constant.
- It was known that when an electric discharge passes in a glass tube through a sufficiently rarefied gas, the part facing the cathode is illuminated by a fluorescence on which the shadow of any obstacle placed in front of the cathode is outlined; and that the cathode rays definable in this way, are deflected by the magnetic field, describing a circular trajectory when they are thrown at right angles to a uniform field (Hittorf).
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