• synonyms


noun Electricity.
  1. an instrument for measuring current in amperes.
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Origin of ammeter

First recorded in 1880–85; am(pere) + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ammeter

Historical Examples

  • Ammeter should show three to five amperes charge with lamps burning.

    The Automobile Storage Battery

    O. A. Witte

  • Each circuit is provided with a separate rheostat and ammeter.

  • A relay snapped, and instantly the ammeter jumped to read 4500 amperes.

    Islands of Space

    John W Campbell

  • They were all up to capacity, save the ammeter from the coils.

    Invaders from the Infinite

    John Wood Campbell

  • The voltmeter cost $7, and the ammeter $10; and the switches and fuses could be had for $5.

    Electricity for the farm

    Frederick Irving Anderson

British Dictionary definitions for ammeter


  1. an instrument for measuring an electric current in amperes
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Word Origin

C19: am (pere) + -meter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ammeter


instrument for measuring the strength of electric currents, 1882, from ampere + -meter.

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Online Etymology Dictionary, © 2010 Douglas Harper

ammeter in Science


  1. An instrument that measures the strength of an electric current, indicating it in amperes. Ammeters typically include a galvanometer; digital ammeters typically include A/D converters as well. Compare ohmmeter voltmeter.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.