Update

You are looking at 1-20 of 889 entries  for:

  • All: cathode x
clear all

Did you mean cathode rays cathode rays

View:

Overview

cathode

A negative electrode. In electrolysis cations are attracted to the cathode. In vacuum electronic devices electrons are emitted by the cathode and flow to the anode. It is therefore from ...

cathode

cathode   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... A negative electrode. Compare anode...

cathode

cathode   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
65 words

...cathode A negative electrode. In electrolysis cations are attracted to the cathode. In vacuum electronic devices electrons are emitted by the cathode and flow to the anode . It is therefore from the cathode that electrons flow into these devices. However, in a primary or secondary cell the cathode is the electrode that spontaneously becomes negative during discharge, and from which therefore electrons...

cathode

cathode   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
65 words

... A negative electrode. In electrolysis cations are attracted to the cathode. In vacuum electronic devices electrons are emitted by the cathode and flow to the anode . It is therefore from the cathode that electrons flow in these devices. However, in a primary or secondary cell the cathode is the electrode that spontaneously becomes negative during discharge, and from which therefore electrons...

cathode

cathode   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
13 words

... the negative electrode to which positive ions are attracted. Contrast with anode...

cathode

cathode   Quick reference

A Dictionary of Chemical Engineering

Reference type:
Subject Reference
Current Version:
2014

...cathode A negative electrode. In the process of electrolysis in which electricity is passed through an electrolyte, positively charged ions (i.e. cations) are attracted to the cathode. Compare anode . ...

cathode

cathode   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
111 words

...cell or battery (of cells); i.e. the pole from which electrons emerge from such a device. Compare anode . —cathodal, cathodic, or cathodical adj. ; cathodally or cathodically ...

cathode

cathode   Quick reference

A Dictionary of Forensic Science

Reference type:
Subject Reference
Current Version:
2013
Subject:
Science and technology, Law
Length:
35 words

... In an electrical system or instrument such as an electrode or a capillary electrophoresis (CE) system, the electrode or zone toward which positively charged species are drawn; cations move toward the cathode...

cathode

cathode   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
21 words

... In chemistry, the negative electrode of an electrolytic cell or electron tube. It attracts positive ions ( cations ) during electrolysis...

cathode

cathode   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
31 words

...cathode n. A negative electrode which in a dental x-ray tube usually consists of a helical tungsten filament with a molybdenum reflector to focus the electron beam on the...

cathode

cathode   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

... The negative electrode of an electrolytic cell, discharge tube, valve, or solid-state rectifier. The electrode by which electrons enter (and conventional current leaves) a system. Compare anode . ...

cathode

cathode   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

... 1. The terminal from which a current leaves an electronic cell, voltaic cell, or battery. 2. The positive terminal of an electronic device, cell, battery, or voltaic cell; opposite to...

unipotential cathode

unipotential cathode   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...cathode An indirectly heated thermionic cathode . ...

cathode rays

cathode rays   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

... rays Streams of electrons emitted from the cathode in an evacuated tube containing a cathode and anode. They were first observed in gas-discharge tubes . ...

cold cathode

cold cathode   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...cathode A cathode from which field emission of electrons occurs at ambient temperatures due to the application of a sufficiently high voltage gradient at its surface. An electron tube containing a cold cathode is a cold-cathode tube . ...

cathode ray

cathode ray   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
62 words

... ray Radiation emitted by the cathode of a thermionic electron valve containing a gas at low pressure. In 1897 J.J. Thomson identified the rays as streams of charged, elementary particles having extremely low mass, later called electrons . Some electrons are emitted because the cathode is heated but most because of collisions between the cathode and positive ions formed in the...

cathode rays

cathode rays   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
74 words

...cathode rays Streams of electrons emitted at the cathode in an evacuated tube containing a cathode and an anode. They were first observed in gas discharge tubes operated at low pressure. Under suitable conditions electrons produced by secondary emission at the cathode are accelerated down the tube to the anode. In such devices as the cathode-ray tube the electrons are produced by thermionic emission from a hot cathode in a...

thermionic cathode

thermionic cathode   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...cathode ( hot cathode ) A cathode in which thermionic emission provides the source of electrons. A directly heated cathode is one that acts as its own source of heat: the cathode is in the form of a filament and the heater current is passed through it, superimposed on the normal cathode potential (usually earth potential). An indirectly heated cathode is one that has a separate heater. The heater is usually a coil of wire formed around the cathode and to which a current is applied. The electron emission from the cathode may be increased by...

cathode rays

cathode rays   Quick reference

A Dictionary of Public Health (2 ed.)

Reference type:
Subject Reference
Current Version:
2018

...cathode rays The stream of electrons emanating from the negative pole (cathode) of a vacuum tube when an electric current is passed through it. At very high voltages, cathode rays emit high-energy X-rays; i.e., ionized radiation. At lower voltages, such as in TV screens and computer monitors, low-energy X-rays are produced but are blocked by lead in the glass screen. ...

virtual cathode

virtual cathode   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

...cathode The surface, located in a space-charge region ( see space charge ) between the electrodes of a thermionic valve , at which the electric potential is a mathematical minimum and the potential gradient is zero. It can be considered to behave as if it were the source of electrons. ...

cathode protection

cathode protection   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

... protection The protection of a metal structure from corrosion by making the metal act as an electrochemical cell. The metal being protected is placed in connection with another metal that is more easily corroded. The more easily corroded metal acts as the anode in the electrochemical cell. The anodic metal corrodes in preference to the other metal; eventually, the more easily corroded metal must be...

View: