femtovolt

Noun
  1. A unit of potential equal to one quadrillionth of a volt (or one thousandth of a nanosecond) (synset 113664588)
    is a type of: potential unit - a measure of the potential energy of a unit charge at a given point in a circuit relative to a reference point (ground)
    is a part of: v, volt - a unit of potential equal to the potential difference between two points on a conductor carrying a current of 1 ampere when the power dissipated between the two points is 1 watt; equivalent to the potential difference across a resistance of 1 ohm when 1 ampere of current flows through it

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