Joule to Electron-volt Conversion
Convert between Joule and Electron-volt quickly and accurately.
How to Convert Joule to Electron-volt
Conversion Formula
Example
Convert 15 J to eV:
Unit Information
Learn about the energy units you're converting between
Joule
J
Definition
The joule (symbol: J) is the SI base unit of energy, work, and heat. It is defined as the work done when a force of one newton moves an object one meter in the direction of the force. One joule equals one newton-meter or one watt-second.
History/Origin
The joule was named after James Prescott Joule (1818-1889), an English physicist who established the mechanical equivalent of heat. It was officially adopted as the SI unit of energy in 1948, replacing the calorie in scientific contexts.
Current Use
Joules are used universally in physics, engineering, and chemistry for measuring energy, work, and heat. Applications include electrical energy calculations, mechanical work, thermal energy, and energy efficiency measurements in all scientific and industrial fields.
Multiplier
1
Offset
0
Electron-volt
eV
Definition
An electron-volt (symbol: eV) is a unit of energy used in atomic and particle physics, equal to approximately 1.602 × 10^-19 joules. It represents the kinetic energy gained by an electron when accelerated through a potential difference of one volt.
History/Origin
The electron-volt was introduced in the early 20th century for describing atomic and particle energies. It became essential in atomic physics, quantum mechanics, and particle physics research, providing a convenient energy scale for subatomic particles.
Current Use
Electron-volts are used in atomic physics for describing atomic energy levels, in particle physics for measuring particle energies, in semiconductor physics for band gap energies, and in nuclear physics for nuclear reaction energies.
Multiplier
2E-19
Offset
0
Joule to Electron-volt Conversion Table
| Joule [J] | Electron-volt [eV] |
|---|---|
| 1 J | 6E+18 eV |
| 10 J | 6E+19 eV |
| 25 J | 2E+20 eV |
| 50 J | 3E+20 eV |
| 100 J | 6E+20 eV |
| 0 J | 0E+0 eV |
| -10 J | -6E+19 eV |
| -40 J | -2E+20 eV |
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