Definition of ammeter in US English:



  • An instrument for measuring electric current in amperes.

    • ‘The current may be measured by digital ammeter to four or five decimal places so the accuracy of the calibration coefficient depends only on the accuracy of the calibrating interferometer.’
    • ‘Variations of resistance are shown on a ammeter which are then interpreted by the trained auditor.’
    • ‘The question demanded to know what measurement an ammeter would give in the circuit.’
    • ‘By connecting the system to a suitably calibrated ammeter, the temperature can be read.’
    • ‘Imagine that conductive electrodes are then attached to the surfaces and connected through an ammeter having a low internal resistance.’
    • ‘One man was hooking up what looked like an ammeter to a glob of flesh - she tried not to think of what it was, while another was examining a picture of a brain on a small computer screen.’


Late 19th century: from ampere + -meter.