Joules ↔ Electronvolts Converter
Convert between joules (J) and electronvolts (eV) instantly
📚 Joules to Electronvolts Conversion Details
Joules to eV Formula
1 electronvolt = 1.602176634 × 10-19 joules
eV to Joules Formula
1 joule = 6.242 × 1018 electronvolts
What is a Joule?
The joule (J) is the SI unit of energy. It's defined as the energy transferred when applying a force of one newton through a distance of one meter.
What is an Electronvolt?
The electronvolt (eV) is the amount of kinetic energy gained by a single electron accelerating through an electric potential difference of one volt.
📊 Conversion Formulas
eV = J ÷ 1.602176634 × 10-19
J = eV × 1.602176634 × 10-19
// Example 1: Convert 5 J to eV
eV = 5 ÷ 1.602176634 × 10-19 = 3.121 × 1019 eV
// Example 2: Convert 100 eV to J
J = 100 × 1.602176634 × 10-19 = 1.602 × 10-17 J
📈 Conversion Table
| Joules (J) | Electronvolts (eV) | Scientific Notation |
|---|---|---|
| 1 J | 6.242e+18 eV | 6.242 × 1018 eV |
| 0.001 J | 6.242e+15 eV | 6.242 × 1015 eV |
| 1.602e-19 J | 1 eV | 1 eV |
| 1.602e-16 J | 1000 eV | 1 keV |
| 1.602e-13 J | 1,000,000 eV | 1 MeV |
| 1.602e-10 J | 1,000,000,000 eV | 1 GeV |
❓ Frequently Asked Questions
A: There are approximately 6.242 × 1018 electronvolts in one joule.
A: 1 eV = 1.602176634 × 10-19 J (exact value since 2019 redefinition of SI units).
A: Electronvolts are commonly used in atomic, nuclear, and particle physics.
A: These are multiples of electronvolts: kiloelectronvolt (keV = 10³ eV), megaelectronvolt (MeV = 10⁶ eV), gigaelectronvolt (GeV = 10⁹ eV).