different between cathode vs phototube

English

Alternative forms

• kathode

Etymology

From Ancient Greek ????- (kata-, “down”) and ???? (hodós, “journey, way”), forming the New Greek compound ??????? (káthodos, “to go down”). Coined by English polymath William Whewell in 1834 for Michael Faraday, who introduced it later that year.

Pronunciation

• IPA^(key): /?kæ?.o?d/

Noun

cathode (plural cathodes)

1. (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 usually, but not always, has a positive voltage.
2. (chemistry, by extension) The electrode at which chemical reduction of cations takes place, usually resulting in the deposition of metal onto the electrode.
3. (electronics) The electrode from which electrons are emitted into a vacuum tube or gas-filled tube.
4. (electronics) That electrode of a semiconductor device which is connected to the n-type material of a p-n junction.

Coordinate terms

• anode

Derived terms

Related terms

• cation

Translations

French

Noun

cathode f (plural cathodes)

1. cathode

Further reading

• “cathode” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

English

Etymology

photo- +? tube

Noun

phototube (plural phototubes)

1. A gas-filled electron tube that has a photosensitive cathode.

Translations