Joule Converter
Convert Joule to Electron Volt and more • 50 conversions
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Unit Explanations
JouleJ
Source UnitThe joule (symbol: J) is the standard unit of energy in the International System of Units (SI). It is defined as the energy transferred when a force of one newton is applied over a distance of one meter. Mathematically, one joule is equivalent to one newton-meter (N·m) or one watt-second (W·s). In terms of electrical energy, one joule is also defined as the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. The joule is named after the English physicist James Prescott Joule, who made significant contributions to thermodynamics and the understanding of energy conservation.
Current Use
The joule is widely used in multiple scientific and engineering disciplines to quantify energy, work, and heat. In physics, it serves as a fundamental measure for energy transfer, particularly in mechanics and thermodynamics. Engineers use joules to calculate energy efficiency in machinery and electricity consumption. In nutrition, energy content in food is often expressed in joules or kilojoules, allowing for a clear understanding of energy intake. The joule is also used in international standards for energy efficiency, such as those set by the International Organization for Standardization (ISO). Countries that employ the SI system, including the UK, Canada, Australia, and most European nations, utilize the joule as the standard unit for energy measurement, ensuring consistency in scientific communication and research.
Fun Fact
The joule can also be defined in terms of calories, where 1 joule is approximately 0.239 calories.
Electron VolteV
Target UnitThe electron volt (eV) is a unit of energy commonly used in the fields of particle physics, atomic physics, and solid-state physics. One electron volt is defined as the amount of kinetic energy gained by a single electron when it is accelerated through an electric potential difference of one volt. This unit is particularly useful when dealing with subatomic particles, as it provides a convenient scale for the energy levels of electrons in atoms, the energy of photons, and other quantum phenomena. In terms of joules, 1 eV is equivalent to approximately 1.602 x 10^-19 joules, making it a practical measure for discussing energies at the atomic and subatomic level.
Current Use
The electron volt is extensively used in various scientific and engineering disciplines, including particle physics, where it is the standard unit for expressing the energies of particles produced in accelerators. In atomic physics, it is used to describe the energy levels of electrons in atoms, which is crucial for understanding atomic structure and behavior. Additionally, in solid-state physics, the electron volt is employed to represent the energy of electrons in semiconductors and insulators, influencing their electrical properties. Countries such as the United States, Germany, and Japan, which lead in scientific research, frequently utilize the electron volt in their experiments, publications, and educational materials. Moreover, it is integral to the fields of astrophysics and cosmology, where it helps to quantify the energy of cosmic rays and the interactions of high-energy particles in the universe.
Fun Fact
The electron volt is of such small magnitude that it is often used in discussions of atomic-scale phenomena.
Convert Joule to Electron Volt (J to eV)
Convert Joules (J) to Electron Volts (eV). When analyzing the energy of light (photons) or chemical bonds, the values in Joules are infinitesimally small. Converting them to eV makes the numbers manageable and comparable to standard atomic data tables.
Divide Joules by roughly 1.602 × 10⁻¹⁹. The result is usually a very large number.
Joule (J)
Definition
The standard unit of energy work.
Origins & History
Fundamental unit of the metric system.
Electron Volt (eV)
Definition
Unit of energy equal to exactly 1.602176634×10⁻¹⁹ joules.
Origins & History
Standard in quantum mechanics.
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= × 1.00000How to Convert
To convert to , multiply the value by 1.00000. This conversion factor represents the ratio between these two units.
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Joule
energy • SI Unit
Definition
The joule (symbol: J) is the standard unit of energy in the International System of Units (SI). It is defined as the energy transferred when a force of one newton is applied over a distance of one meter. Mathematically, one joule is equivalent to one newton-meter (N·m) or one watt-second (W·s). In terms of electrical energy, one joule is also defined as the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. The joule is named after the English physicist James Prescott Joule, who made significant contributions to thermodynamics and the understanding of energy conservation.
History & Origin
The joule was named after James Prescott Joule, an English physicist known for his pioneering work on the mechanical equivalent of heat and the first law of thermodynamics. Joule's experiments in the mid-19th century demonstrated the relationship between mechanical work and heat, leading to the establishment of the principle of energy conservation. His work laid the foundation for the study of thermodynamics and energy transfer, which ultimately influenced the definition of the joule as a unit of energy.
Etymology: The term 'joule' is derived from the name of James Prescott Joule, reflecting his significant contributions to the understanding of energy and thermodynamics.
Current Use
The joule is widely used in multiple scientific and engineering disciplines to quantify energy, work, and heat. In physics, it serves as a fundamental measure for energy transfer, particularly in mechanics and thermodynamics. Engineers use joules to calculate energy efficiency in machinery and electricity consumption. In nutrition, energy content in food is often expressed in joules or kilojoules, allowing for a clear understanding of energy intake. The joule is also used in international standards for energy efficiency, such as those set by the International Organization for Standardization (ISO). Countries that employ the SI system, including the UK, Canada, Australia, and most European nations, utilize the joule as the standard unit for energy measurement, ensuring consistency in scientific communication and research.
💡 Fun Facts
- •The joule can also be defined in terms of calories, where 1 joule is approximately 0.239 calories.
- •James Prescott Joule, for whom the unit is named, was also a brewer and applied his knowledge of energy to measure heat in brewing.
- •In some contexts, the joule is used to measure the energy content of food as kilojoules (kJ), making it essential for dietary guidelines.
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Electron Volt
energy • Non-SI
Definition
The electron volt (eV) is a unit of energy commonly used in the fields of particle physics, atomic physics, and solid-state physics. One electron volt is defined as the amount of kinetic energy gained by a single electron when it is accelerated through an electric potential difference of one volt. This unit is particularly useful when dealing with subatomic particles, as it provides a convenient scale for the energy levels of electrons in atoms, the energy of photons, and other quantum phenomena. In terms of joules, 1 eV is equivalent to approximately 1.602 x 10^-19 joules, making it a practical measure for discussing energies at the atomic and subatomic level.
History & Origin
The concept of the electron volt was developed in the early 20th century as physicists began to explore the properties of electrons and their interactions with electric and magnetic fields. The term emerged from the need for a practical unit that could express the energy of electrons in a straightforward manner, particularly in experiments involving cathode rays and electric fields. The formal introduction of the electron volt as a unit of measurement allowed scientists to quantify the energy changes associated with electron transitions in atoms and to relate these energies to observable phenomena in experiments.
Etymology: The term 'electron volt' combines 'electron,' derived from the Greek 'ēlektron,' meaning 'amber' (a material historically associated with static electricity), and 'volt,' named after the Italian physicist Alessandro Volta, who is credited with the invention of the electric battery.
Current Use
The electron volt is extensively used in various scientific and engineering disciplines, including particle physics, where it is the standard unit for expressing the energies of particles produced in accelerators. In atomic physics, it is used to describe the energy levels of electrons in atoms, which is crucial for understanding atomic structure and behavior. Additionally, in solid-state physics, the electron volt is employed to represent the energy of electrons in semiconductors and insulators, influencing their electrical properties. Countries such as the United States, Germany, and Japan, which lead in scientific research, frequently utilize the electron volt in their experiments, publications, and educational materials. Moreover, it is integral to the fields of astrophysics and cosmology, where it helps to quantify the energy of cosmic rays and the interactions of high-energy particles in the universe.
💡 Fun Facts
- •The electron volt is of such small magnitude that it is often used in discussions of atomic-scale phenomena.
- •One electron volt is equivalent to the energy gained by an electron due to the potential difference of a typical battery cell.
- •In particle physics, energies are commonly expressed in giga-electronvolts (GeV) or tera-electronvolts (TeV) for high-energy collisions.
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