What is Energy?

References:

Energy - Wikipedia

https://en.wikipedia.org/wiki/Energy

Law of Conservation of Energy - Wikipedia

https://en.wikipedia.org/wiki/Conservation_of_energy

Isolated System - Wikipedia

https://en.wikipedia.org/wiki/Isolated_system

Time Translation Symmetry - Wikipedia

https://en.wikipedia.org/wiki/Time_translation_symmetry

Noether’s Theorem - Wikipedia

https://en.wikipedia.org/wiki/Noether%27s_theorem

Conservative Force - Khan Academy

https://www.khanacademy.org/science/high-school-physics/work-and-energy-2/gravitational-potential-energy-and-conservative-forces/v/conservative-forces

Electronvolt - Wikipedia

https://en.wikipedia.org/wiki/Electronvolt

Potential Energy - Wikipedia

https://en.wikipedia.org/wiki/Potential_energy

Kinetic Energy - Wikipedia

https://en.wikipedia.org/wiki/Kinetic_energy

Mechanical Energy - Wikipedia

https://en.wikipedia.org/wiki/Mechanical_energy

Chemical Energy - Wikipedia

https://en.wikipedia.org/wiki/Chemical_energy

Electrical Energy - Wikipedia

https://en.wikipedia.org/wiki/Electrical_energy

Thermal Energy - Wikipedia

https://en.wikipedia.org/wiki/Thermal_energy

Nuclear Energy - Wikipedia

https://en.wikipedia.org/wiki/Nuclear_power

Radiant Energy - Wikipedia

https://en.wikipedia.org/wiki/Radiant_energy