The capacity to do work is called energy. Work is the transfer of energy. Energy can also be transformed. For example, a plant can transform solar energy into chemical energy. The plant can then be burned in a steam generator. Thus its energy is transformed into the energy of motion. 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 (CT scan machine).
  • The pull of a magnet.

States of Energy

Energy exists in two states:

  1. Kinetic energy: The energy due to motion is called kinetic energy. For example, thundering waterfall.
  2. Potential energy: The stored energy is called potential energy. Energy in chemical bonds is a form of potential energy in a living animal. Animals use the bond energy in organic molecules in biological work. Much of the work an animal involves the transformation of potential energy to kinetic energy in its cells.Me surernent of energy

    En gy is measured in terms of heat production. The study of energy is called the modynamics. The commonly used unit for measuring heat in an animal is the ilocalorie or calorie.



    (a)         kilocalorie (Kcal) is the amount of heat required to raise temperature 1 kg of water by 1° C. It is equal to 1,000 calories. A daily intake of energy or an average person is approximately 2,000 to 2,500 kcal,

    (b)        calorie (c) is the amount of heat required to raise the temperature of 1 (1 cc) of water 1°C from 14.5 to 15.5° C.

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