The energy is the capacity to do work. The work is made once a force is applied on an object over a length. Whatever active object has the kinetic energy or energy of motion and it hence can do work. So, the work has to be made on an object to change its kinetic energy (K.E). Kinetic energy of an object of mass (m), and velocity (v) is given by the formula:
Normally the energy can be used and stored at a later time of period. E.g., compressed water and spring checked by a dam both have the potentiality to do
work and they are said to own potential energy (P.E). Once the water or spring is released its potential energy is changed into the kinetic energy and
other different forms of energy such as heat etc.
Energy related to the gravitational attraction near the surface of the earth is potential energy (P.E). Different forms of energy are actually combinations of energy of potential and kinetic. The chemical energy, e.g., is the electrical potential energy stored in molecules. The heat energy is a combination of the kinetic and potential energy of the atoms in a matter.
Energy can be divided into different types. Some of the energy types are mechanical energy, chemical energy, electrical energy, radiant energy, thermal energy and nuclear energy. Let us learn them clearly from the below explanations.
Mechanical energy is a type of energy that is created by any physical movements or rotation of an object. For example, moving cars or moving elevators.
The chemical energy is the energy stored in compounds of chemical and molecules and is found in wood, petroleum, food, coal and other fuels in the environment.
The electrical energy is produced once unequal forces between protons and electrons in molecules produce moving negatrons known as electric current. The electricity is a 'secondary' source of energy. That means different sources of energy are necessary to produce electricity.
The radiant energy is carried by waving. Alterations in the internal energy of molecules cause the particles to emit energy in the kind of electromagnetic wave which includes visible radiation, UV (ultraviolet) radiation, infrared radiation (IR), radio radiation, gamma radiation, X-rays and microwaves. The electromagnetic wave from the sunlight.
The heat energy or thermal energy is related to the vibration or motion of atoms in a particle. Once a thermal system alters, the heat flows out or in of the system. The heat energy flows from hot bodies to cold bodies.
The nuclear energy is the energy that comes by the binding of the neutrons and protons that comprise the nucleus of the molecules. Nuclear energy can be liberated from particles in 2 different methods: the nuclear fission or nuclear fusion. In nuclear fusion reaction, the energy is liberated once atoms are fused together or combined and this is how the sun liberates energy.
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