J to eV Converter - Joule to Electron Volt
Joule (J) to Electron Volt (eV)
Direct answer
1 J = 6.24150907e+18 eV
eV = J × 6.24150907e+18
Converter
Conversion formula
eV = J × 6.24150907e+18
J = eV × 1.60217663e-19
Example: 10 J = 10 × 6.24150907e+18 = 6.24150907e+19 eV.
Common conversion table
| J | eV |
|---|---|
| 1 J | 6.24150907e+18 eV |
| 2 J | 1.24830181e+19 eV |
| 5 J | 3.12075454e+19 eV |
| 10 J | 6.24150907e+19 eV |
| 20 J | 1.24830181e+20 eV |
| 50 J | 3.12075454e+20 eV |
| 100 J | 6.24150907e+20 eV |
| 1,000 J | 6.24150907e+21 eV |
Conversion derivation
Express both J and eV in the same base unit J (joule), then cancel the shared base unit.
- 1
Rewrite J in the base unit
- 2
Rewrite eV in the base unit
- 3
Forward conversion
- 4
Reverse conversion
AI explanation for this conversion
This pre-generated explanation is schema-checked. Numeric results still come from the page formula and calculator.
Why the Joule to Electron Volt Conversion Factor Holds
This conversion factor is derived from the definition of the electron volt. The electron volt is the amount of energy gained by a single electron accelerating through an electric potential difference of one volt. Its value in joules is a fixed constant.
Definition
The electron volt (eV) is a unit of energy defined as the amount of kinetic energy gained or lost by a single electron accelerating from rest through an electric potential difference of one volt in vacuum.
Principle
The conversion factor is the reciprocal of the fixed value of one electron volt expressed in the SI unit of energy, the joule. Dividing 1 J by 1.60217663e-19 J/eV gives the number of eV in one joule.
Assumptions
- The conversion uses the defined exact value of the elementary charge and the volt to derive the joule equivalent of the electron volt.
Cautions
- The conversion is exact by definition, but applying it may introduce rounding errors in calculations due to the very large or very small numerical values involved.
- Ensure the precision of the result matches the needs of your calculation, as the FAQ suggests.
FAQ
How many eV are in 1 J?
1 J = 6.24150907e+18 eV.
How many eV are in 10 J?
10 J = 6.24150907e+19 eV.
How many eV are in 100 J?
100 J = 6.24150907e+20 eV.
What is the formula to convert J to eV?
Use eV = J × 6.24150907e+18.
How many J are in 1 eV?
1 eV = 1.60217663e-19 J.
What should I check when converting J to eV?
Use the conversion factor and round the result to the precision required by your calculation.