What is energy? Briefly described

 What is energy?

Hi friends my name is "Hadi Rana". Our today's topic is What is energy?

          

Figure 1.1

Energy is the capacity to do work. 👉 Work is the transfer of energy. Energy can also be transformed. For example, A plant can transform solar energy. (See figure 1.1). The plant can then be burned in a steam generator and the energy transformed into the energy of motion ( e.g., the running of a wheel). energy has many forms: the heat from a furnace, the sound of a jet plane, the electric current that lights a bulb, The radioactivity in a heart pacemaker, or the pull of a magnet.

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               Energy exists in two states: Kinetic and potential. kinetic energy is the energy of motion ( e.g., a thundering waterfall). Potential energy is stored energy. ( e.g., a giant boulder poised on a pinnacle). In a living animal, energy is chemical bonds is a form of chemical energy. 👉 Animals use the bond energy in organic molecules to accomplish biological work. Much of the work an animal performs involves the transformation of potential energy into to kinetic energy in its cells. 

              The most convenient way to measure energy is in terms of heat production.  This is why the study of energy is called thermodynamics. (Gr. theme, heat + dynamics, power). The most commonly employed unit of measuring heat in an animal is the kilocalorie (kcal) or nutritional Calorie ( notice the large "C"). A kilocalorie is the amount of heat necessary to raise 1 kg of water 1°C and is equal to 1,000 calories. A reasonable daily intake of energy for an average person is approximately 2,000 to 2, 500 Kcal. A calorie (notice the small "c") is the amount of heat it takes to raise the temperature of 1 g (1cc) of water 1° ( usually from 14.5 to 15.5° C). 

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