noun Electricity.

  1. an instrument for measuring electric resistance in ohms.


  1. an instrument for measuring electrical resistance

  1. An instrument used for direct measurement of the electrical resistance of a material or electronic component, usually in ohms. Ohmmeters typically use an ammeter to measure current through the material after it has been given some set voltage by the ohmmeter; the direct-current resistance of the sample can then be directly determined through Ohm’s law. Compare voltmeter.

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