78 relations: Alarm clock, Amplifier, Analog signal, Astron (wristwatch), Atomic clock, Automatic quartz, Average, Balance wheel, Bell Labs, Binary number, Button cell, Cantilever, Celestial navigation, Chronometer watch, Clock, Clock drift, Crystal oscillator, Crystal oven, David William Dye, Density, Digital data, Digital electronics, Electric watch, Electronic filter, Electronic oscillator, Encyclopædia Britannica, Epoch (reference date), Frequency, Fundamental frequency, Fused quartz, Fuze, High frequency, Integrated circuit, Issac Koga, Jacques Curie, Kilogram, Laser, Lavet-type stepping motor, Light-emitting diode, Liquid-crystal display, List of IEEE milestones, Logic gate, Longitude, MOSFET, National Institute of Standards and Technology, National Physical Laboratory (United Kingdom), Newton (unit), Order of magnitude, Oscillation, Parts-per notation, ..., Pascal (unit), Pendulum clock, Phonograph, Pierce oscillator, Pierre Curie, Piezoelectricity, Q factor, Quartz, Quartz crisis, Radio clock, Resonator, Seiko, Semiconductor, Shot noise, Silicon dioxide, Solar-powered watch, Solid-state electronics, Temperature, Thermal expansion, Time, Time lock, Timer, Tuning fork, United Kingdom, Vacuum tube, Walter Guyton Cady, Watch, Young's modulus. Expand index (28 more) » « Shrink index
An alarm clock (or sometimes just an alarm) is a clock that is designed to alert an individual or group of individuals at specified time.
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current).
An analog signal is any continuous signal for which the time varying feature (variable) of the signal is a representation of some other time varying quantity, i.e., analogous to another time varying signal.
The Astron wristwatch, formally known as the Seiko Quartz-Astron 35SQ, was the world's first "quartz clock" wristwatch.
An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.
Automatic quartz is a collective term describing watch movements that combine a self-winding rotor mechanism (as used in automatic mechanical watches) to generate electricity with a piezoelectric quartz crystal as its timing element.
In colloquial language, an average is a middle or typical number of a list of numbers.
A balance wheel, or balance, is the timekeeping device used in mechanical watches and some clocks, analogous to the pendulum in a pendulum clock.
Nokia Bell Labs (formerly named AT&T Bell Laboratories, Bell Telephone Laboratories and Bell Labs) is an American research and scientific development company, owned by Finnish company Nokia.
In mathematics and digital electronics, a binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically 0 (zero) and 1 (one).
A watch battery or button cell is a small single cell battery shaped as a squat cylinder typically in diameter and high — like a button on a garment, hence the name.
A cantilever is a rigid structural element, such as a beam or a plate, anchored at one end to a (usually vertical) support from which it protrudes; this connection could also be perpendicular to a flat, vertical surface such as a wall.
Celestial navigation, also known as astronavigation, is the ancient and modern practice of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position.
A chronometer is a specific type of mechanical timepiece tested and certified to meet certain precision standards.
A clock is an instrument to measure, keep, and indicate time.
Clock drift refers to several related phenomena where a clock does not run at exactly the same rate as a reference clock.
A crystal oscillator is an electronic oscillator circuit that uses the mechanical resonance of a vibrating crystal of piezoelectric material to create an electrical signal with a precise frequency.
A crystal oven is a temperature-controlled chamber used to maintain the quartz crystal in electronic crystal oscillators at a constant temperature, in order to prevent changes in the frequency due to variations in ambient temperature.
David William Dye FRS (30 December 1887 – 18 February 1932) was an English physicist.
The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume.
Digital data, in information theory and information systems, is the discrete, discontinuous representation of information or works.
Digital electronics or digital (electronic) circuits are electronics that operate on digital signals.
In horology the term electric watch is used for the first generation electrically-powered wristwatches which were first publicly displayed by both Elgin National Watch Company and LIP on the 19th of March 1952 with working laboratory examples in Chicago and Paris.
Electronic filters are circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.
An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.
The Encyclopædia Britannica (Latin for "British Encyclopaedia"), published by Encyclopædia Britannica, Inc., is a general knowledge English-language encyclopaedia.
In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era.
Frequency is the number of occurrences of a repeating event per unit of time.
The fundamental frequency, often referred to simply as the fundamental, is defined as the lowest frequency of a periodic waveform.
Fused quartz or fused silica is glass consisting of silica in amorphous (non-crystalline) form.
In military munitions, a fuze (sometimes fuse) is the part of the device that initiates function.
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz).
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, normally silicon.
Issac (Issaku) Koga (December 5, 1899 in Tashiro Village (now Tosu), Saga Prefecture, Japan – September 2, 1982) the eldest of 7 children.
Paul-Jacques Curie (29 October 1855 – 19 February 1941) was a French physicist and professor of mineralogy at the University of Montpellier.
The kilogram or kilogramme (symbol: kg) is the base unit of mass in the International System of Units (SI), and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as "Le Grand K" or "Big K"), a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France.
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
The Lavet-type stepping motor has widespread use as a drive in electro-mechanical clocks and is a special kind of single-phase stepping motor.
A light-emitting diode (LED) is a two-lead semiconductor light source.
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals.
This list of IEEE Milestones describes the Institute of Electrical and Electronics Engineers (IEEE) milestones, representing key historical achievements in electrical and electronic engineering.
In electronics, a logic gate is an idealized or physical device implementing a Boolean function; that is, it performs a logical operation on one or more binary inputs and produces a single binary output.
Longitude, is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
MOSFET showing gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (white). surface-mount packages. Operating as switches, each of these components can sustain a blocking voltage of 120nbspvolts in the ''off'' state, and can conduct a continuous current of 30 amperes in the ''on'' state, dissipating up to about 100 watts and controlling a load of over 2000 watts. A matchstick is pictured for scale. A cross-section through an nMOSFET when the gate voltage ''V''GS is below the threshold for making a conductive channel; there is little or no conduction between the terminals drain and source; the switch is off. When the gate is more positive, it attracts electrons, inducing an ''n''-type conductive channel in the substrate below the oxide, which allows electrons to flow between the ''n''-doped terminals; the switch is on. Simulation result for formation of inversion channel (electron density) and attainment of threshold voltage (IV) in a nanowire MOSFET. Note that the threshold voltage for this device lies around 0.45 V The metal-oxide-semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon.
The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.
The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, London, England.
The newton (symbol: N) is the International System of Units (SI) derived unit of force.
An order of magnitude is an approximate measure of the number of digits that a number has in the commonly-used base-ten number system.
Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.
The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength.
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element.
The phonograph is a device for the mechanical recording and reproduction of sound.
The Pierce oscillator is a type of electronic oscillator particularly well-suited for use in piezoelectric crystal oscillator circuits.
Pierre Curie (15 May 1859 – 19 April 1906) was a French physicist, a pioneer in crystallography, magnetism, piezoelectricity and radioactivity.
Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress.
In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is, and characterizes a resonator's bandwidth relative to its centre frequency.
Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
The quartz crisis (also known as the quartz revolution) is a term used in the watchmaking industry to refer to the economic upheavals caused by the advent of quartz watches in the 1970s and early 1980s, which largely replaced mechanical watches.
A radio clock or radio-controlled clock (RCC) is a clock that is automatically synchronized by a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
A resonator is a device or system that exhibits resonance or resonant behavior, that is, it naturally oscillates at some frequencies, called its resonant frequencies, with greater amplitude than at others.
(), commonly known as Seiko, is a Japanese holding company that has subsidiaries which manufactures and sells watches, clocks, electronic devices, semiconductors, jewelries, and optical products.
A semiconductor material has an electrical conductivity value falling between that of a conductor – such as copper, gold etc.
Shot noise or Poisson noise is a type of electronic noise which can be modeled by a Poisson process.
Silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with the chemical formula, most commonly found in nature as quartz and in various living organisms.
A solar-powered watch or light-powered watch is a watch that is powered entirely or partly by a solar cell.
Solid-state electronics means semiconductor electronics; electronic equipment using semiconductor devices such as semiconductor diodes, transistors, and integrated circuits (ICs).
Temperature is a physical quantity expressing hot and cold.
Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature.
Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.
A time lock (also timelock) is a part of a locking mechanism commonly found in bank vaults and other high-security containers.
A timer is a specialized type of clock used for measuring specific time intervals.
A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel).
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,Usage is mixed with some organisations, including the and preferring to use Britain as shorthand for Great Britain is a sovereign country in western Europe.
In electronics, a vacuum tube, an electron tube, or just a tube (North America), or valve (Britain and some other regions) is a device that controls electric current between electrodes in an evacuated container.
A watch is a timepiece intended to be carried or worn by a person.
Young's modulus, also known as the elastic modulus, is a measure of the stiffness of a solid material.