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In physics and other sciences, energy (from the Greekἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos,"active, working") is a scalar physical quantity that is a property ofobjects and systems which is conserved by nature.

Energy is often defined as the ability to do work.Several different forms of energy, including kinetic, potential,thermal, gravitational, sound energy, light energy, elastic,electromagnetic, chemical, nuclear, and mass have been defined toexplain all known natural phenomena.While one form of energy may be transformed to another, the totalenergy remains the same.

This principle, the conservation of energy, was first postulated in theearly 19th century, and applies to any isolated system. According toNoether's theorem, the conservation of energy is a consequence of thefact that the laws of physics do not change over time.Although the total energy of a system does not change with time, itsvalue may depend on the frame of reference. For example, a seatedpassenger in a moving airplane has zero kinetic energy relative to theairplane, but non-zero kinetic energy relative to the earth.

Source: Wikipedia/Energy
Photo: Photovoltaics & Solar Hot Water

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