Enter your Voltage, select a Charge Unit Type, and fill in the Electric Charge to calculate the resulting Energy in electron volts (eV) — plus a bonus conversion showing that same Energy in Joules.
Energy
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Energy in Joules
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The formula depends on the charge unit. For elementary charge: E(eV) = V(V) × Q(e). For coulombs: E(eV) = V(V) × Q(C) / 1.602176634×10⁻¹⁹.
An electron-volt is a unit of energy equal to the kinetic energy gained by a single electron when accelerated through an electric potential difference of one volt. It equals approximately 1.602×10⁻¹⁹ joules.
No, you cannot directly convert volts to electron-volts because they represent different physical quantities. Volts measure electrical potential, while electron-volts measure energy. You need to multiply voltage by electric charge to get energy.
Elementary charge is the electric charge carried by a single proton or the magnitude of the negative electric charge carried by a single electron. It equals approximately 1.602176634×10⁻¹⁹ coulombs.
To convert electron-volts to joules, multiply the energy in eV by 1.602176634×10⁻¹⁹. For example, 1 eV = 1.602176634×10⁻¹⁹ joules.
Use elementary charge when dealing with individual particles like electrons or protons. Use coulombs when working with macroscopic charges or when the charge is already given in coulombs in your problem.
This conversion is commonly used in atomic physics, nuclear physics, particle accelerators, X-ray spectroscopy, and semiconductor physics where particle energies are typically measured in electron-volts.