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ShareIn general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change.
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The most common definition of energy is the work that a certain force (gravitational, electromagnetic, etc) can do.
Due to a variety of forces, energy has many different forms (gravitational, electric, heat, etc.) that can be grouped into two major categories: kinetic energy and potential energy.
According to this definition, energy has the same units as work; a force applied through a distance.
The SI unit of energy, the joule, equals one newton applied through one meter, for example.
Energy has no direction in space, and is therefore considered a scalar quantity. Energy is a conserved quantity, meaning that it cannot be created or destroyed, but only converted from one form into another.
Thus, the total energy of the universe always remains constant.
One form of energy can be readily transformed into another; for instance, a battery converts chemical energy into electrical energy.
For more information about the topic Energy, read the full article at Wikipedia.org, or see the following related articles:
Kinetic energy — Kinetic energy is energy that a body possess as a result of its motion. Kinetic energy as it is mathematically written is the "classic statement" of: ... > read more
Potential energy — Potential energy is stored energy. Potential energy is the energy that exists by virtue of the relative positions (configurations) of the objects ... > read more
Electric power — Electric power is the amount of work done by an electric current in a unit time. When a current flows in a circuit with resistance, it does work. ... > read more
Torque — In physics, torque can informally be thought of as "rotational force" or "angular force" which causes a change in rotational motion. This force is ... > read more
Momentum — In physics, momentum is the product of the mass and velocity of an object. Momentum has the special property that, in a closed system, it is always ... > read more
Mass — Mass is a property of a physical object that quantifies the amount of matter it contains. Unlike weight, the mass of something stays the same ... > read more
Friction — Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact. It is also the contact of two objects ... > read more
Electricity — Electricity is a property of matter that results from the presence or movement of electric charge. Together with magnetism, it constitutes the ... > read more
Surface tension — Surface tension is an effect within the surface layer of a liquid that causes the layer to behave as an elastic sheet. It is the effect that allows ... > read more
Radiant energy — Radiant energy is the energy of electromagnetic waves. The term is most commonly used in the fields of radiometry, solar energy, heating and ... > read moreRecommend this page on Facebook, Twitter,
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