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Wednesday 20 April 2022


Definition : Energy is a physical quantity measuring the capacity of a system to modify a state, to produce a work producing a movement, heat or an electromagnetic radiation.

In physics, energy is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.

Energy is a conserved quantity. The law of conservation of energy states that energy can be converted in form, but not created or destroyed.

The unit of measurement in the International System of Units (SI) of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of one metre against a force of one newton.

Living organisms require energy to stay alive, such as the energy humans get from food and oxygen.


- energy metabolism


- energy and ageing