# ampere

### or ampère

[am-peer, am-peer] /ˈæm pɪər, æmˈpɪər/
noun, Electricity
1.
the basic unit of electrical current in the International System of Units (SI), equivalent to one coulomb per second, formally defined to be the constant current which if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed one meter apart in vacuum, would produce between these conductors a force equal to 2 × 10 −7 newton per meter of length.
Abbreviation: A, amp.
Origin of ampere
1881
1881; named after A. M. Ampère

## Ampère

[am-peer; French ahn-per] /ˈæm pɪər; French ɑ̃ˈpɛr/
noun
1.
André Marie
[ahn-drey muh-ree;; French ahn-drey ma-ree] /ˈɑn dreɪ məˈri;; French ɑ̃ˈdreɪ maˈri/ (Show IPA),
1775–1836, French physicist.
Related forms
Amperian
[am-peer-ee-uh n, -per-] /æmˈpɪər i ən, -ˈpɛr-/ (Show IPA),
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for ampere
Historical Examples
• A fraction of an ampere through the human heart muscles can be fatal.

Eric B. Wilson
• The filament current of an audion-bulb averages about one ampere.

O. A. Witte
• An ampere is 6.3 billion electrons passing one point in a circuit, in one second.

Eric B. Wilson
• But it is a little different when one is interested in an ampere.

John Mills
• A mil-ampere is a thousandth of an ampere just as a millimeter is a thousandth of a meter.

John Mills
• Now I want to tell you how the physicists at the Bureau know what is an ampere.

John Mills
• The ammeter indicated only half as much as before, that is .008 ampere.

John F. Woodhull
• But I admired him, for he had every ampere of his self-possession in hand; my own case was different.

Sax Rohmer
• The increase in weight shows the amount of chemical action which is proportional to the ampere hours.

Thomas M. (Thomas Matthew) St. John
• Its resistance is just such that 110 volts of pressure send one ampere through it.

John F. Woodhull
British Dictionary definitions for ampere

## ampere

/ˈæmpɛə/
noun
1.
the basic SI unit of electric current; the constant current that, when maintained in two parallel conductors of infinite length and negligible cross section placed 1 metre apart in free space, produces a force of 2 × 10–7 newton per metre between them. 1 ampere is equivalent to 1 coulomb per second
2.
a former unit of electric current (international ampere); the current that, when passed through a solution of silver nitrate, deposits silver at the rate of 0.001118 gram per second. 1 international ampere equals 0.999835 ampere
amp, A
Word Origin
C19: named after André Marie Ampère

## Ampère

/ˈæmpɛə; French ɑ̃pɛr/
noun
1.
André Marie (ɑ̃dre mari). 1775–1836, French physicist and mathematician, who made major discoveries in the fields of magnetism and electricity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ampere
n.

1881, "the current that one volt can send through one ohm," from French ampère, named for French physicist André-Marie Ampère (1775-1836). Shortened form amp is attested from 1886.

Online Etymology Dictionary, © 2010 Douglas Harper
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ampere in Medicine

ampere am·pere (ām'pēr')
n.
Abbr. A

1. A unit of electric current in the meter-kilogram-second system, equal to the current that, flowing in two parallel wires one meter apart, produces a force of 2 × 10-7 newtons per meter.

2. A unit in the International System specified as one International coulomb per second and equal to 0.999835 ampere.

The American Heritage® Stedman's Medical Dictionary
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ampere in Science
 ampere   (ām'pîr')    The SI unit used to measure electric current. Electric current through any given cross-section (such as a cross-section of a wire) may be measured as the amount of electrical charge moving through that cross-section in one second. One ampere is equal to a flow of one coulomb per second, or a flow of 6.28 × 1018 electrons per second.
 Ampère   (ām'pîr', äm-pěr')    French mathematician and physicist who is best known for his analysis of the relationship between magnetic force and electric current. He formulated Ampère's law, which describes the strength of the magnetic field produced by the flow of energy through a conductor. The ampere unit of electric current is named for him.
The American Heritage® Science Dictionary
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ampere in Technology

unit, electronics
(Amp, A) The unit of electrical current flow. One Amp is the current that will flow through a one-ohm resistance when one Volt DC is applied across it.
(2004-01-18)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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10
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