Energy

Energy is a fundamental concept in physics, referring to the capacity of a physical system to perform work. It can be classified into various forms such as kinetic, potential, thermal, electrical, chemical, and nuclear energy. In everyday usage, energy often refers to the ability to do work or cause change, and it is measured in units like joules (J) or ergs in the International System of Units (SI). The term "energy" is derived from the Greek word "ἐνέργεια" (energeia), which means "activity" or "operation." In Hebrew, energy is translated as אנרגיה (energiya). In other languages, it is known as énergie in French, energía in Spanish, Energie in German, and energia in Italian and Portuguese. Energy is a crucial concept in various fields, including physics, chemistry, biology, and engineering, and it plays a vital role in understanding the workings of the universe, from the smallest particles to the largest galaxies. The law of conservation of energy, a fundamental principle in physics, states that energy cannot be created or destroyed, only transformed from one form to another.