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By Shailendra Singh
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Updated on 5 Mar 2025, 17:33 IST
Joule and electron-volt (eV) are both units of energy, but they are used in different contexts and are associated with different physical phenomena.
The joule is the SI (International System of Units) unit of energy. It is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter in the direction of the force.
In simpler terms, it’s a measure of the work done or energy expended. The joule is a fundamental unit and is used to measure various forms of energy, including mechanical, thermal, and electromagnetic energy.
The electron-volt is a unit of energy commonly used in the field of particle physics and quantum mechanics. It is the amount of energy gained or lost by an electron when it is accelerated through an electric potential difference of one volt.
The electron-volt is particularly useful when dealing with atomic and subatomic particles because their energies are often in the range of electron-volts. The electron-volt is a convenient unit for describing energy on a smaller scale than the joule.
1J = 6.241509e18 eV = 6.241509⋅1018 eV
Conversion formula for joules to eV
E(eV) = E(J) × 6.241509⋅1018
| Energy (J) | Energy (eV) |
| 1 J | 6.241509⋅1018 eV |
| 2 J | 1.248302⋅1019 eV |
| 3 J | 1.872453⋅1019 eV |
| 4 J | 2.496604⋅1019 eV |
| 5 J | 3.120755⋅1019 eV |
| 6 J | 3.744906⋅1019 eV |
| 7 J | 4.369057⋅1019 eV |
| 8 J | 4.993207⋅1019 eV |
| 9 J | 5.617358⋅1019 eV |
| 10 J | 6.241509⋅1019 eV |
| 20 J | 1.248302⋅1020 eV |
| 30 J | 1.872453⋅1020 eV |
| 40 J | 2.496604⋅1020 eV |
| 50 J | 3.120755⋅1020 eV |
| 60 J | 3.744906⋅1020 eV |
| 70 J | 4.369057⋅1020 eV |
| 80 J | 4.993207⋅1020 eV |
| 90 J | 5.617358⋅1020 eV |
| 100 J | 6.241509⋅1020 eV |
| 200 J | 1.248302⋅1021 eV |
| 300 J | 1.872453⋅1021 eV |
| 400 J | 2.496604⋅1021 eV |
| 500 J | 3.120755⋅1021 eV |
| 600 J | 3.744906⋅1021 eV |
| 700 J | 4.369057⋅1021 eV |
| 800 J | 4.993207⋅1021 eV |
| 900 J | 5.617358⋅1021 eV |
| 1000 J | 6.241509⋅1021 eV |
Converting joules (J) to electronvolts (eV) is like changing from one money currency to another. You can use a conversion factor: 1 Joule is equal to about 6.242 x 10^18 electronvolts.
1 joule is like having 6.242 x 10^18 tiny electronvolts. It's like saying 1 dollar is equal to 100 cents.
If you have 4 with 19 zeros after it joules, that's like having around 2.5 x 10^38 electronvolts. It's like having a really big amount of money, trillions and trillions of electronvolts.
Having 4.8 with 20 zeros after it electronvolts is about the same as having 77 joules. It's like having a small amount of money, just a few dollars.
1 electronvolt (eV) is like a tiny unit of energy, like having a small coin. It's the energy an electron (a tiny particle in atoms) gains when it moves through an electric field.
The value of energy E in electronvolts (eV) is like telling you how much energy something has. It's like saying how much money you have, but in terms of electronvolts.