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, as into the air by a spark, or to pass from a body of greater to one of less electrical potential. It varies as the quantity of electricity upon a given area. Tension brace, or Tension member (Engin.), a brace or member designed to resist tension, or subjected to tension, in a structure. -- Tension rod (Engin.), an…

r of acting or of invisible efficacy without the agency of the material or sensible part; potential; energizing. Heat and cold have a virtual transition, without communication of substance. Bacon. Every kind that lives, Fomented by his virtual power, and warmed. Milton.

Potentiality; efficacy; potential existence. [Obs.] In one grain of corn, there lieth dormant a virtuality of many other. Sir T. Browne.

Electric potential or potential difference, expressed in volts.

An instrument for measuring in volts the differences of potential between different points of an electrical circuit.