voltmeter


voltmeter
/vohlt"mee'teuhr/, n. Elect.
a calibrated instrument for measuring the potential difference between two points.
[1880-85; VOLT1 + -METER]

* * *

      instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts). The typical commercial or laboratory standard voltmeter in use today is likely to employ an electromechanical mechanism in which current flowing through turns of wire is translated into a reading of voltage. Other types of voltmeters include the electrostatic voltmeter, which uses electrostatic forces and, thus, is the only voltmeter to measure voltage directly rather than by the effect of current. The potentiometer operates by comparing the voltage to be measured with known voltage; it is used to measure very low voltages. The electronic voltmeter, which has largely replaced the vacuum-tube voltmeter, uses amplification or rectification (or both) to measure either alternating- or direct-current voltages. The current needed to actuate the meter movement is not taken from the circuit being measured; hence, this type of instrument does not introduce errors of circuit loading.

      The instruments just described provide readings in analogue form, by moving a pointer that indicates voltage on a scale. Digital voltmeters give readings as numerical displays. They also provide outputs that can be transmitted over distance, can activate printers or typewriters, and can feed into computers. Digital voltmeters generally have a higher order of accuracy than analogue instruments.

      An instrument that also measures ohms and amperes (in milliamperes) is known as a volt-ohm-milliammeter, or sometimes as a multimeter.

* * *


Universalium. 2010.

Look at other dictionaries:

  • Voltmeter — Volt me ter, n. [2d volt + meter.] (elec.) An instrument for measuring in volts the differences of potential between different points of an electrical circuit. [1913 Webster] …   The Collaborative International Dictionary of English

  • Voltmēter — (Spannungsmesser), s. Elektrotechnische Meßinstrumente, S. 693, und Elektrometer …   Meyers Großes Konversations-Lexikon

  • Voltmeter — Voltmeter, s. Meßinstrumente, elektrotechnische. Bd. 6, S. 376 u. 380 …   Lexikon der gesamten Technik

  • Voltmeter — Voltmēter, ein Galvanometer, das unmittelbar die elektromotorische Kraft einer Batterie in Volt angibt. (S. auch Voltameter.) …   Kleines Konversations-Lexikon

  • voltmeter — (n.) 1882, from VOLT (Cf. volt) + METER (Cf. meter) (n.3) …   Etymology dictionary

  • voltmeter — ► NOUN ▪ an instrument for measuring electric potential in volts …   English terms dictionary

  • voltmeter — [vōlt′mēt΄ər] n. [ VOLT2 + METER] Elec. an instrument for measuring voltage …   English World dictionary

  • Voltmeter — Demonstration voltmeter from a physics class A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. Analog voltmeters move a pointer across a scale in proportion to the voltage… …   Wikipedia

  • Voltmeter — Ein Spannungsmessgerät (auch als Spannungsmesser oder überholt als Voltmeter bezeichnet) dient zur Messung elektrischer Spannungen. Der Begriff Voltmeter ist seit Langem in der Normung ersetzt worden und sollte nicht mehr verwendet werden, da mit …   Deutsch Wikipedia

  • voltmeter — UK [ˈvəʊltˌmiːtə(r)] / US [ˈvoʊltˌmɪtər] noun [countable] Word forms voltmeter : singular voltmeter plural voltmeters physics a piece of equipment used for measuring voltage …   English dictionary


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.