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About Energy

In physics, energy is a conserved extensive property of a physical system, which cannot be observed directly but can be calculated from its state. Energy is of central importance in physics. It is impossible to give a comprehensive definition of energy because of the many forms it may take, but the most common definition is that it is the capacity of a system to perform work. The definition of work in physics is the movement of a force through a distance, and energy is measured in the same units as work. If a person pushes an object x meters against an opposing force of F newtons, Fx joules (newton-meters) of work has been done on the object; the person's body has lost Fx joules of energy, and the object has gained Fx joules of energy. The SI unit of energy is the joule (J) (equivalent to a newton-meter or a watt-second); the CGS unit is the erg, and the Imperial unit is the foot pound. Other energy units such as the electron volt, calorie, BTU, and kilowatt-hour (1 kWh = 3600 kJ) are used in specific areas of science and commerce.
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