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the basic unit of electrical current in the (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.
André Marie
[ahn-drey muh-ree;; French ahn-drey ma-ree] /ˈɑn dreɪ məˈri;; French ɑ̃ˈdreɪ maˈri/ (Show IPA), 1775–1836, French physicist.
Historical Examples

A fraction of an ampere through the human heart muscles can be fatal.
Electricity for the 4-H Scientist Eric B. Wilson

The filament current of an audion-bulb averages about one ampere.
The Automobile Storage Battery O. A. Witte

An ampere is 6.3 billion electrons passing one point in a circuit, in one second.
Electricity for the 4-H Scientist Eric B. Wilson

But it is a little different when one is interested in an ampere.
Letters of a Radio-Engineer to His Son John Mills

A mil-ampere is a thousandth of an ampere just as a millimeter is a thousandth of a meter.
Letters of a Radio-Engineer to His Son John Mills

Now I want to tell you how the physicists at the Bureau know what is an ampere.
Letters of a Radio-Engineer to His Son John Mills

The ammeter indicated only half as much as before, that is .008 ampere.
The Library of Work and Play: Electricity and Its Everyday Uses John F. Woodhull

But I admired him, for he had every ampere of his self-possession in hand; my own case was different.
The Return of Dr. Fu-Manchu Sax Rohmer

The increase in weight shows the amount of chemical action which is proportional to the ampere hours.
Things a Boy Should Know About Electricity Thomas M. (Thomas Matthew) St. John

Its resistance is just such that 110 volts of pressure send one ampere through it.
The Library of Work and Play: Electricity and Its Everyday Uses John F. Woodhull

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
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
André Marie (ɑ̃dre mari). 1775–1836, French physicist and mathematician, who made major discoveries in the fields of magnetism and electricity

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.

ampere am·pere (ām’pēr’)
Abbr. A

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.

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

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.
(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.

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.


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  • Ampere-turn

    one complete convolution of a conducting coil, through which one ampere of current passes. the magnetomotive force produced by one ampere passing through one complete turn or convolution of a coil. Abbreviation: At. noun a unit of magnetomotive force; the magnetomotive force produced by a current of 1 ampere passing through one complete turn of […]

  • Amperometric

    pertaining to or involving the measurement of an electric current.

  • Amperometric titration

    titration in which the end point is determined by measuring the amperage of an electric current of given voltage that is passed through the solution.

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