What does volt mean?
A volt is the SI unit of electric potential difference, the separation in electrical charge that tends to drive current between two points. The unit is equal to one joule of energy per coulomb of charge, is written with the symbol V, and takes its name from the Italian physicist Alessandro Volta. Volt is ubiquitous in descriptions of batteries, household electricity, electronic devices, and electrical power systems. The word also has an older, more specialized group of meanings connected with turning: as a noun it can denote a quick pivot or a horse's backward turning leap, and as a verb it can mean to turn or move sharply. These movement senses remain intelligible in formal and equestrian contexts but are much less common than the electrical unit. Volt should not be confused with voltage: a volt is the unit used to measure voltage, while voltage is the quantity being measured.
The SI unit of electric potential difference, equal to one joule per coulomb and symbolised V. In older or specialist usage, a rapid turn or a horse's backward turning leap.
"The device requires a twelve-volt power supply."
When used as a unit, volt normally follows a numerical value and may be abbreviated to V.
To turn or pivot sharply, especially by making a backward turning leap.
"The horse volted sharply and retreated."
This use is uncommon outside literary, sporting, and specialist equestrian contexts.
The plural is used when stating a number of units or comparing multiple electrical potential differences.
"The two batteries operate at twelve and twenty-four volts respectively."
One volt moves one joule of energy per coulomb—and carries the name of the scientist who made the electric battery practical.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does volt come from?
The electrical sense of volt came through French from the name of Alessandro Volta, the Italian physicist who developed the voltaic pile. The older turning sense derives from French volt and Italian voltare, related to the Latin volvere, meaning “to turn.” The same Latin root underlies musical volta and also connects with the forms voltage, voltaic, and voltmeter associated with Volta's name.
Related word forms
How volt is actually used
Volt is standard technical English and is usually used with a numerical value. The senses involving turning or a horse are literary and specialist, chiefly associated with classical riding, and are uncommon in general modern usage.
Easily confused with volt
A volt is the unit used to measure electric potential difference, whereas voltage is the potential difference itself.