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Relation Between eV and Joule

Last updated date: 23rd May 2024
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What is the Relation Between Electron Volt and Joule?

Before starting with the conversion of electron volt to joule, let us first understand what these units are and when they are used. An electron volt is a unit used to describe the amount of energy gained by an electron when it is being accelerated under a potential difference of 1 volt.  When an electron, at rest, is moved through a potential difference of 1V, whatever energy is gained by it is termed as 1 eV. 

eV is the short form of electron-volt. It is a unit of energy. Particularly, this symbol is used in high-energy physics. 

eV has many forms, such as KeV, MeV, GeV, or TeV. Also, joule is the energy of work. It is a derived form of energy.  In this article, you will learn how to convert electron-volt into joule and vice versa. 

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Conversion of eV to Joule 

Have you ever wondered about the relationship between joule and eV? Both joule and eV are units of energy. However, they are found in two different systems.

Scientists have predicted their relation in a mathematical form. Do you know, 1eV is equal to how many joules? 

1 eV to J can be written as:

1eV = 1.602 × 10-19 J

In the above expression, eV = electron volt and J = joule

How Do You Explain the Unit ‘Joule’?

1 unit joule is the amount of work done or transfers of energy on an object with a force of 1 newton that acts on the object in the identical direction of its motion along 1 metre of distance.

The formula for 1 J = 6.2415 × 1018 eV

The conversion of eV to joule is very significant. The values can be used to solve multiple problems in Physics. The table given below will show the conversion values of eV to joule:

eV (in Energy) 

Joules (in Energy)

1 eV

1.60218 × 10-19 J

2 eV

3.2044 ×10-19 J

3 eV

4.8065 × 10-19 J

4 eV

6.4087 × 10-19 J

5 eV

8.0109 × 10-19 J

6 eV

9.6131 × 10-19 J

7 eV

1.1215 × 10-18 J

8 eV

1.2817 × 10-17 J

9 eV

1.442 × 10-18 J

10 eV

1.6022 × 10-18 J

50 eV

8.0109 × 10-18 J

100 eV

1.6022 × 10-17 J

500 eV

8.0109 × 10-17 J

1000 eV

1.6022 × 10-16 J

Conversion of Joules to Electron-Volt

The above table shows you the eV to joule conversion. Now, it is time to reveal the conversion of joules to eV. The table given below will show you some values which are the conversion of joules in eV:

Joules (in Energy form)

eV (in Energy form)

1 J

6.242 × 1018 eV

2 J

1.248 × 1019 eV

3 J

1.872 × 1019 eV

4 J

2.497 × 1019 eV

5 J

3.121 × 1019 eV

6 J

3.745 × 1019 eV

7 J

4.369 × 1019 eV

8 J

4.993 × 1019 eV

9 J

5.617 × 1019 eV

10 J

6.242 × 1019 eV

50 J

3.121 × 1020 eV

100 J

6.242 × 1020 eV

500 J

3.121 × 1021 eV

1000 J

6.242 × 1021 eV

Application of eV and Joule

electron-volt to joule conversion is also important for solving different types of problems in physics. The values given in the table are very useful for easier calculation. You need to understand the concept and memorise the conversion values for better results. Both are commonly used as units of energy. 

  • The implementation of eV is everywhere, such as the atomic state, solid-state, nuclear physics and Particle physics.

  • The value of 1eV is validated again under the redefinition of SI base units in 2019. Also, eV is used with different metric prefixes, such as mega-, kilo-, giga-, tera-, peta-, and exa-.

Also, the SI unit for energy is joule. Both are different but can be related to each other. volt and electron volt are two different units. eV is symbolised for energy whereas volt is the resultant SI unit from electric potential.


In this article, you got to know the relation between eV And joule in detail, along with their applications in the modern world of Physics.

FAQs on Relation Between eV and Joule

1. Define 1 eV?

1 eV is the amount of energy gained by an electron when it is accelerated through a potential difference of 1 V. When an electron is accelerated with a potential difference of 1 volt, electrons gain some energy which is called electron volt. The numerical value of 1eV is equivalent to the charge on one electron, i.e., 1eV = 1.6 x 10-19 joule.

2. In which field of physics, the unit eV is used for energy extensively?

The unit eV is used for energy mostly in the field of modern physics like the work function of a metal, nuclear physics, particle physics etc. Also, electron volt is extensively used by astronomers to calculate electromagnetic radiation. 

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