How Many Joules In 1 Electron Volt

Answer: 1 \mathrm{eV}=1.602 \times 10^{-19} \mathrm{~J} 1 eV = 1.602 × 10^-19 J

Energy is referred to by scientists as the capacity to do work. We, humans, have figured out many ways to transform energy from one form to another and then utilise them to accomplish tasks, thereby enabling modern civilization possible. Walking and bicycling uses energy in our bodies, driving cars on roads and boats through water uses the chemical energy stored in fuels, cooking meals on stoves and making ice in freezers utilizes the heat energy, lighting our homes and workplaces and producing goods need electric energy, and sending astronauts into space utilises multiple forms of energy. This shows how important the term energy is in our life.

As we have discussed earlier, there are numerous types of energy, such as Heat, nuclear, Light, Motion, chemical, Electrical, Gravitational, etc. These energies can be divided into two categories that can be used to do work:

• Potential energy: The energy stored in a body due to its position relative to some relative position.

• Kinetic energy: The energy acquired by an object due to its motion.

The work required to move an electric charge of one coulomb through an electrical potential difference of one volt is termed a joule. This relationship can also be used to define the volt. Joule is the unit of both energy and work. It is abbreviated as J.

A single electron accelerates from rest across an electric potential difference of one volt in a vacuum, producing an amount of kinetic energy known as an electronvolt (symbol eV, also spelt electron volt and electron-volt). It is a common unit of energy, widely used in the solid state, nuclear, atomic, and particle physics, and astrophysics.

Important points to remember:

• Measures of energy include the electron volt (eV) and the joule (J). Depending on the need, we perform computations using either or both units.

• An electron volt is an energy unit, while the Joule is the SI unit of energy. It is possible to understand Joules and eV in relation to one another.

• The most common unit for measuring energy is the joule, while the most typical unit for calculating the energy of atomic energy levels is the electron volt (eV).

Example

1. Now let us find how many Joules are present in 2 Electron Volts.

\ \text{Electrostatic energy }=\mathrm{W}=\text{ Charge of electron} \times \text{Potential difference}\

\text{Charge of electron} =1.6 \times 10^{-19} \mathrm{C}\

2 electron volt is defined as the amount of energy acquired by an electron which is accelerated through a potential difference of 2 volts.

\ \text{Potential difference} =2 \mathrm{V} \

\begin{aligned}

& W=1.6 \times 10^{-19} \times 2 \

& \ \ \ \ =3.2 \times 10^{-19} \mathrm{~J} \

& 2 \mathrm{eV}=3.2 \times 10^{-19} \mathrm{~J}

\end{aligned}

Since joule is a unit of energy.

2. Now let us find how many Joules are present in 8 Electron Volts.

\ \text{Electrostatic energy }=\mathrm{W}=\text{ Charge of electron} \times \text{Potential difference}\

\text{Charge of electron} =1.6 \times 10^{-19} \mathrm{C}\

8 electron volt is defined as the amount of energy acquired by an electron which is accelerated through a potential difference of 8 volts.

\ \text{Potential difference} =8 \mathrm{V} \

\begin{aligned}

& W=1.6 \times 10^{-19} \times 8 \

& \ \ \ \ =12.8 \times 10^{-19} \mathrm{~J} \

& 8 \mathrm{eV}=12.8 \times 10^{-19} \mathrm{~J}

\end{aligned}

Since joule is a unit of energy.

3. How many Joules are present in 35 Electron Volts?

\ \text{Electrostatic energy }=\mathrm{W}=\text{ Charge of electron} \times \text{Potential difference}\

\text{Charge of electron} =1.6 \times 10^{-19} \mathrm{C}\

35 electron volt is defined as the amount of energy acquired by an electron which is accelerated through a potential difference of 35 volts.

\ \text{Potential difference} =35 \mathrm{V} \

\begin{aligned}

& W=1.6 \times 10^{-19} \times 35 \

& \ \ \ \ =56 \times 10^{-19} \mathrm{~J} \

& 35 \mathrm{eV}= 56\times 10^{-19} \mathrm{~J}

\end{aligned}

Since joule is a unit of energy.