13-letter words containing b, e, t
- electron tube — (electronics) (Or tube, vacuum tube, UK: valve, electron valve, thermionic valve, firebottle, glassfet) An electronic component consisting of a space exhausted of gas to such an extent that electrons may move about freely, and two or more electrodes with external connections. Nearly all tubes are of the thermionic type where one electrode, called the cathode, is heated, and electrons are emitted from its surface with a small energy (typically a Volt or less). A second electrode, called the anode (plate) will attract the electrons when it is positive with respect to the cathode, allowing current in one direction but not the other. In types which are used for amplification of signals, additional electrodes, called grids, beam-forming electrodes, focussing electrodes and so on according to their purpose, are introduced between cathode and plate and modify the flow of electrons by electrostatic attraction or (usually) repulsion. A voltage change on a grid can control a substantially greater change in that between cathode and anode. Unlike semiconductors, except perhaps for FETs, the movement of electrons is simply a function of electrostatic field within the active region of the tube, and as a consequence of the very low mass of the electron, the currents can be changed quickly. Moreover, there is no limit to the current density in the space, and the electrodes which do dissapate power are usually metal and can be cooled with forced air, water, or other refrigerants. Today these features cause tubes to be the active device of choice when the signals to be amplified are a power levels of more than about 500 watts. The first electronic digital computers used hundreds of vacuum tubes as their active components which, given the reliability of these devices, meant the computers needed frequent repairs to keep them operating. The chief causes of unreliability are the heater used to heat the cathode and the connector into which the tube was plugged. Vacuum tube manufacturers in the US are nearly a thing of the past, with the exception of the special purpose types used in broadcast and image sensing and displays. Eimac, GE, RCA, and the like would probably refer to specific types such as "Beam Power Tetrode" and the like, and rarely use the generic terms. The cathode ray tube is a special purpose type based on these principles which is used for the visual display in television and computers. X-ray tubes are diodes (two element tubes) used at high voltage; a tungsten anode emits the energetic photons when the energetic electrons hit it. Magnetrons use magnetic fields to constrain the electrons; they provide very simple, high power, ultra-high frequency signals for radar, microwave ovens, and the like. Klystrons amplify signals at high power and microwave frequencies.
- elephantbirds — Plural form of elephantbird.
- embarrassment — A feeling of self-consciousness, shame, or awkwardness.
- embellishment — A decorative detail or feature added to something to make it more attractive.
- embranchments — Plural form of embranchment.
- embranglement — Embroilment, entanglement; the state of being or getting embrangled.
- embrittlement — The characteristic or process of being embrittled.
- embryogenetic — embryogenic
- employability — (uncountable) The state or quality of being employable.
- emtricitabine — A nucleoside reverse transcriptase inhibitor for the treatment of HIV infection.
- endosymbiotic — Of or pertaining to endosymbiosis.
- enumerability — The condition of being enumerable.
- equilibrating — Present participle of equilibrate.
- equilibration — The formation, or maintenance, of an equilibrium.
- equilibratory — Relating to the physical sense of balance, or equilibrium.
- equilibristic — Of or pertaining to equilibristics.
- equitableness — The state or quality of being equitable; equitability.
- erythroblasts — Plural form of erythroblast.
- erythrophobia — Abnormal and persistent fear of blushing.
- establishable — Able to be established.
- establishment — The action of establishing something or being established.
- estimableness — The quality of deserving esteem or regard.
- ethnobotanist — A scholar or researcher in the field of ethnobotany.
- exacerbations — Plural form of exacerbation.
- examinability — The quality or state of being examinable.
- exceptionable — Open to objection; causing disapproval or offense.
- excitableness — The quality of being excitable, excitability.
- excludability — The ability to be excluded.
- executive job — a job in which a person is responsible for the administration of a project, activity, or business
- exhibitioners — Plural form of exhibitioner.
- exhibitionism — Extravagant behavior that is intended to attract attention to oneself.
- exhibitionist — A person who behaves in an extravagant way in order to attract attention.
- expandability — (uncountable) The condition of being expandable.
- expansibility — The condition of being expansible.
- expendability — The state or quality of being expendable.
- explicability — The state of being explicable.
- exportability — The property of being exportable.
- extendability — Extensibility.
- extensibility — The capability of being extended.
- extrabiblical — Outside the Bible.
- extrudability — the quality of being extrudable
- fabric filter — A fabric filter is a type of filter in which solids are removed from a gas by passing it though a fabric.
- fallibilities — (of persons) liable to err, especially in being deceived or mistaken.
- farm-to-table — noting or relating to fresh, locally sourced food sold to local consumers or restaurants: farm-to-table meats and seasonal vegetables.
- fast-breaking — (of a news story) occurring suddenly, and often portending a series of events or further developments in rapid succession.
- fatigableness — the quality of being fatigable
- fault breccia — angular rock fragments produced by fracture and grinding during faulting and distributed within or adjacent to the fault plane.
- feasibilities — Plural form of feasibility.
- featherbedded — Simple past tense and past participle of featherbed.
- featherbrains — Plural form of featherbrain.