Only show
results for:

Topics related to "ampere"

ampere
ampere , abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system . The ampere is officially defined as the current in a pair of equally long, parallel, straight wires 1 meter apart that produces a force of 0.0000... Read more
ohm
ohm ōm [for G. S. Ohm ], unit of electrical resistance , defined as the resistance in a circuit in which a potential difference of one volt creates a current of one ampere; hence, 1 ohm equals 1 volt/ampere. The megohm (1,000,000 ohms) and the milliohm (.001 ohm) are units derived from the ... Read more
ammeter
ammeter , instrument used to measure the magnitude of an electric current of several amperes or more. An ammeter is usually combined with a voltmeter and an ohmmeter in a multipurpose instrument. Most ammeters are based on the d'Arsonval galvanometer and are of the analog type, i.e., they give cur... Read more
Dachau
Dachau , city, Bavaria, S Germany, on the Amper River; chartered in 1391. It is a rail junction and its industries include the production of paper, cardboard, electrical equipment, and textiles. There is a 16th-century castle. Nearby was (1933-45) the first Nazi concentration camp , which today has... Read more
volt
volt [for Alessandro Volta ], abbr. V, unit of electric potential and electromotive force . It is defined as the difference of electric potential existing across the ends of a conductor carrying a constant current of 1 ampere when the power dissipated is 1 watt. The kilovolt (1,000 V), the mill... Read more
electric current
electric current Movement of electric charges, usually the flow of electrons along a conductor or the movement of ions through an electrolyte. This is caused by freely moving particles usually charged by a mains supply or battery. Current (symbol I) flows from a positive to a negative terminal, alt... Read more
André Marie Ampère
André Marie Ampère , 1775-1836, French physicist, mathematician, and natural philosopher. He was professor of mathematics at the École Polytechnique, Paris, and later at the Collège de France. Known for his contributions to electrodynamics, including the formulation of Am... Read more
International System of Units
International System of Units officially called the Système International d'Unités, or SI, system of units adopted by the 11th General Conference on Weights and Measures (1960). It is based on the metric system . The basic units of length, mass, and time are those of the mks system ... Read more
watt
watt [for James Watt ], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the amount of power that is delivered to a component of an electric circuit when a current of 1 ampere flows through the ... Read more
transformer
transformer electrical device used to transfer an alternating current or voltage from one electric circuit to another by means of electromagnetic induction . The simplest type of transformer consists of two coils of wire, electrically insulated from one another and arranged so that a change in the... Read more

Encyclopedia entries related to "ampere"

ampere
Book article from: The Columbia Encyclopedia, Sixth Edition ampere , abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system . The ampere is officially defined as the current in a pair of equally long, parallel...
Electric Current
Encyclopedia entry from: The Gale Encyclopedia of Science ...current is measured in amperes, with one ampere equal to a charge...trillionth of an ampere) can be significant...the millions of amperes can be created for...product of current in amperes and the time in...current flows. If one ampere flows for one second...
Electricity
Encyclopedia entry from: The Gale Encyclopedia of Science ...than others, silver being the best. Current The basic unit of electric current is the ampere, named for the French physicist Andre Marie Ampere. One ampere equals 1 coulomb of charge drifting past a reference point each second. Voltage Voltage...
SI units
Book article from: World Encyclopedia ...length, kilogram (kg) for mass, second (s) for time, ampere (A) for electrical current, Kelvin (K) for temperature...Length metre m Mass kilogram kg Time second s Electric current ampere A Thermodynamic temperature kelvin K Amount of substance mole...
coulomb
Book article from: The Columbia Encyclopedia, Sixth Edition coulomb [for C. A. de Coulomb ], abbr. coul or C, unit of electric charge . The absolute coulomb, the current U.S. legal standard, is the amount of charge transferred in 1 second by a current of 1 ampere ; i.e., it is 1 ampere-second.
transformer
Book article from: The Columbia Encyclopedia, Sixth Edition ...primary and secondary coils. For example, if a 10-volt, 2-ampere alternating current were to flow through a 10-turn primary...theoretically a 20-turn secondary would exhibit a 20-volt, 1-ampere alternating current, with the output impedance four times as...
battery
Book article from: World Encyclopedia ...storage batteries) can be recharged when a current passed through them in the reverse direction restores the original chemical state. A battery's capacity is normally measured in ampere-hours; one ampere-hour is equal to 3600 coulombs.
Ohm’S Law
Encyclopedia entry from: The Gale Encyclopedia of Science ...voltage, properly called the potential difference, is measured in volts, and the current in amperes. The resistance therefore has units of volts per ampere, defined as ohms ( Ω ). Ohm ’ s law is not a fundamental law that always...
Dielectric Materials
Encyclopedia entry from: The Gale Encyclopedia of Science ...conductance of one siemens has an electrical potential difference of one volt, which produces a one-ampere current; thus, siemens = ampere/volts. In theory, dielectrics can include solids, liquids, and gases, although in practice only...
Electric Arc
Encyclopedia entry from: The Gale Encyclopedia of Science ...gradient between the electrodes (less than a few tens of volts), and a high current density (from 0.1 amperes to thousands amperes or higher). High gas temperatures (several thousands or tens of thousands degrees Kelvin) exist in the...

Dictionary entries related to "ampere"

amperes per metre
Book article from: A Dictionary of Earth Sciences amperes per metre (A/m) The SI unit of magnetic moment per unit volume. 1 A/m = 10 3 gauss.
ampere
Book article from: A Dictionary of Nursing ampere ( am -pair) n. the basic SI unit of electric current. It is equal to the current flowing through a conductor of resistance 1 ohm when a potential difference of 1 volt is applied between its ends. Symbol: A.
SI units
Book article from: A Dictionary of Ecology ...length); kilogram (kg, mass); second (s, time); ampere (A, electric current); kelvin (K, thermodynamic temperature...2 pounds 1 lb = 0.454 kg time second s electric current ampere A thermodynamic temperature kelvin K 1°C = 1.8...
emu
Book article from: A Dictionary of Earth Sciences emu Electromagnetic units in the c.g.s . units (gauss, oersteds, etc.). These have now been replaced by SI units of ampere per metre , weber per metre, and tesla .
SI
Book article from: A Dictionary of Earth Sciences ...comprises seven basic and two supplementary units. The basic units are the: metre (m); kilogram (kg); second (s); ampere (A); kelvin (K); mole (mol); and candela (cd). The supplementary units are the: radian (rad); and steradian...
ammeter
Book article from: The Oxford Pocket Dictionary of Current English am·me·ter / ˈa(m)ˌmētər / • n. an instrument for measuring electric current in amperes.
A
Book article from: The Oxford Pocket Dictionary of Current English ...x220E;  ace (used in describing play in bridge and other card games): you cash AK of hearts. ∎  ampere(s). ∎  ( Å ) ångstrom(s). ∎  answer. ∎ ...
henry
Book article from: The Oxford Pocket Dictionary of Current English ...H ) • n. ( pl. hen·ries or hen·rys ) Physics the SI unit of inductance, equal to an electromotive force of one volt in a closed circuit with a uniform rate of change of current of one ampere per second.
current
Book article from: The Oxford Pocket Dictionary of Current English ...charged particles. ∎  a quantity representing the rate of flow of electric charge, usually measured in amperes. ∎  the general tendency or course of events or opinion: the student movement formed a distinct current...
amp
Book article from: The Oxford Pocket Dictionary of Current English amp 1 / amp / • n. short for ampere . amp 2 • n. inf. short for amplifier . • v. (often amp something up ) 1. play (music) through electric...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Ampere's magnetic circuital law: A simple and rigorous two-step proof
Magazine article from: International Journal of Electrical Engineering Education; 7/1/2001; ; 700+ words ; Abstract A new proof of Ampere's law from the Biot-Savart law is...electric currents in free space. Keywords Ampere's law; electromagnetics; postulates...with particular reference to the way Ampere's magnetic circuital law is derived...
An augmented Lagrangian approach to the numerical solution of the Dirichlet problem for the elliptic monge-ampere equation in two dimensions.
Magazine article from: Electronic Transactions on Numerical Analysis; 1/1/2006; ; 700+ words ; ...problem for the real elliptic Monge-Ampere equation, in two dimensions, by an augmented...advantage of a reformulation of the Monge-Ampere problem as a saddle-point one, for...converging to a solution of the Monge-Ampere problem under consideration, if such...
Ampere Media Assesses Options.(Ampere Media LLC)(Reid Group LLC)
Newspaper article from: Mergers & Acquisitions Report; 7/19/2004; ; 700+ words ; Privately held Ampere Media LLC wants to sell itself. The Chicago...a managing director with Reid, said Ampere, which was founded in 1995, would be...to expand their business," he said. Ampere's technology gets consumers interested...
The ampere and electrical standards.
Magazine article from: Journal of Research of the National Institute of Standards and Technology; 1/1/2001; ; 700+ words ; ...dynamiques (1872), Andre Marie Ampere made deductions from experiments on magnetic fields and electric currents. Ampere proved that two currents produce a...N/[A.sup.2] defines the ampere in such a way that electrical and...
The Complex Monge-Ampere Equation and Pluripotential Theory.(Brief Article)(Book Review)
Magazine article from: SciTech Book News; 9/1/2006; 446 words ; 082183763X The complex Monge-Ampere equation and pluripotential theory. Kolodziej...existence theorems for the complex Monge- Ampere equation which are proved by pluripotential...Dirichlet problem for the complex Monge- Ampere equation, proves the stability of weak...
Tanfield and Ford unveil the Ampere; In association with RBS.(Business)
Newspaper article from: The Journal (Newcastle, England); 4/16/2008; 700+ words ; ...Ford with yesterday's unveiling of the Ampere, which was developed entirely in the...the NEC in Birmingham yesterday. The Ampere - which Tanfield chief executive Darren...100 miles on one battery charge. The Ampere has a top speed of 70mph. It weighs 2...
Optoisolators compute watts and volt-amperes.
Magazine article from: EDN; 2/21/2008; 570 words ; ...acquires not only watts, but also volt-amperes and so makes possible an estimation of power factor-watts divided by volt-amperes. The right-hand side of the circuit in...analog voltage proportional to load volt-amperes.
Diodes Incorporated Introduces 1-Watt Zener and 2-Ampere Schottky Devices Using Innovative PowerDI123 Packaging.
Business Wire; 3/16/2005; 700+ words ; ...Watt Zener devices and a series of 2-Ampere Schottky devices. "These two new products...include a comprehensive selection of 2-Ampere, low-voltage Schottky rectifiers...double the current density of our 1-Ampere line introduced last year and demonstrates...
Approximating the value functions of stochastic knapsack problems: a homogeneous Monge-Ampere equation and its stochastic counterparts.(Report)
Magazine article from: International Journal of Mathematics and Statistics; 9/22/2008; ; 700+ words ; ...limit, diffusion approximation, Monge-Ampere equation. 2000 Mathematics Subject Classification...limit we obtain is a solution of Monge-Ampere equation, one of the most important nonlinear...partial differential equations. Monge-Ampere equation was linked to crucial quantities...
A superconducting tape ... mass produced? (new tape carries 1 million amperes of electric current per square centimeter; new methods for producing high-temperature superconducting wire in mass quantities)(Brief Article)
Magazine article from: Science News; 4/29/1995; ; 700+ words ; ...flexible superconducting tape that carries more than 1 million amperes of electric current per square centimeter of material has proven...the number 12 copper wire used in most homes carries only 800 amperes of current per square centimeter. The researchers produce...