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There are formulas for calculating a numerical quantity, we call energy. The joule J is its unity.



In physics we have no knowledge of what energy is. It is a mathematical principle that has a large number of different forms:

• Chemical energy
• Elastic energy
Electrical energy
Gravitational energy
Heat energy
• Internal energy
Kinetic energy
Mass energy
Momentum energy
• Nuclear energy
Photon energy
Potential energy
Quantum potential energy
• Radiant energy
Relativistic energy
Thermal energy
Work energie
Zero-point energy

When we observe a system in nature and calculate the quantity again, it always stays the same. The conservation of energy is one of the most basic laws of physics.



The joule is named after the English physicist James Prescott Joule (1818 - 1889).

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