electronvolt
Sign in to saveIn physics, an electronvolt (symbol eV), also written as electron-volt and electron volt, is a unit of measurement equivalent to the amount of kinetic energy gained by a single electron accelerating through an electric potential difference of one volt in a vacuum. When used as a unit of energy, the numerical value of 1 eV expressed in unit of joules (symbol J) is equal to the numerical value of the charge of an electron in coulombs (symbol C). Under the 2019 revision of the SI, this sets 1 eV equal to the exact value Historically, the electronvolt was devised as a standard unit of measur
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An electronvolt (eV) is a unit of energy that measures the kinetic energy gained by a single electron when it accelerates through an electric potential difference of one volt. Physicists use electronvolts as a standard way to describe energy in atomic and subatomic processes, where the more familiar joule would result in impractically small numbers.
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Key facts
- Unit.name
- electronvolt
- Unit.standard
- Non-SI accepted unit
- Unit.quantity
- energy
- Unit.symbol
- eV
- Unit.units1
- SI units
- Unit.units2
- CGS units
- Unit.units4
- kilowatt-hours
- Unit.units5
- kilocalories (thermochemical)
- Unit.units6
- BTUs
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Article
13 sectionsContents
- Definition and use
- Relation to other physical properties and units
- Mass
- Momentum
- Distance
- Temperature
- Wavelength
- Scattering experiments
- Energy comparisons
- Molar energy
- See also
- References
- External links
In physics, an electronvolt (symbol eV), also written as electron-volt and electron volt, is a unit of measurement equivalent to the amount of kinetic energy gained by a single electron accelerating through an electric potential difference of one volt in a vacuum. When used as a unit of energy, the numerical value of 1 eV expressed in unit of joules (symbol J) is equal to the numerical value of the charge of an electron in coulombs (symbol C). Under the 2019 revision of the SI, this sets 1 eV equal to the exact value Historically, the electronvolt was devised as a standard unit of measure through its usefulness in electrostatic particle accelerator sciences, because a particle with electric charge q gains an energy after passing through a voltage of V.
== Definition and use == An electronvolt is the amount of energy gained or lost by a single electron when it moves through an electric potential difference of one volt. Hence, it has a value of one volt, which is , multiplied by the elementary charge Therefore, one electronvolt is equal to