## ampere

ampere (ăm´pēr), 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 0.0000002 newton (2 × 10-7 N) between the wires for each meter of their length. Current meters such as ammeters and galvanometers are calibrated in reference to a current balance that actually measures the force between two wires.

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"ampere." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 27 May. 2017 <http://www.encyclopedia.com>.

"ampere." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (May 27, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ampere

"ampere." The Columbia Encyclopedia, 6th ed.. . Retrieved May 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/ampere

## ampere

ampere (symbol A) SI unit of electric current. It is defined as the current in a pair of straight, parallel conductors of infinite length and 1m (39in) apart in a vacuum that produces a force of 2 × 10−7 newton per metre in their length. This force may be measured on a current balance instrument, the standard against which current meters, such as an ammeter, are calibrated.

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"ampere." World Encyclopedia. . Encyclopedia.com. 27 May. 2017 <http://www.encyclopedia.com>.

"ampere." World Encyclopedia. . Encyclopedia.com. (May 27, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ampere

"ampere." World Encyclopedia. . Retrieved May 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/ampere

## ampere

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.

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"ampere." A Dictionary of Nursing. . Encyclopedia.com. 27 May. 2017 <http://www.encyclopedia.com>.

"ampere." A Dictionary of Nursing. . Encyclopedia.com. (May 27, 2017). http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/ampere

"ampere." A Dictionary of Nursing. . Retrieved May 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/caregiving/dictionaries-thesauruses-pictures-and-press-releases/ampere

## ampère

ampère unit of electric current. XIX. f. name of A. M. Ampère (d. 1836); adopted by the Congrès Électrique at Paris, 1881. abbrev. amp.

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"ampère." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 27 May. 2017 <http://www.encyclopedia.com>.

"ampère." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (May 27, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ampere-0

"ampère." The Concise Oxford Dictionary of English Etymology. . Retrieved May 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/ampere-0

## ampere

ampereampere, milliampere •compère