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The Energy is a quantity that is often understood as the ability a physical system has to do work on other physical systems.Since work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length.

The total energy contained in an object is identified with its mass, and energy (like mass), cannot be created or destroyed. When matter (ordinary material particles) is changed into energy (such as energy of motion, or into radiation), the mass of the system does not change through the transformation process. However, there may be mechanistic limits as to how much of the matter in an object may be changed into other types of energy and thus into work, on other systems. Energy, like mass, is a scalar physical quantity. In the International System of Units (SI), energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary. All of these units translate to units of work, which is always defined in terms of forces and the distances that the forces act through.

Potential Energy

potential energy

Lightning is the electric breakdown of air by strong electric fields, which produce a force on charges. When these charges move through a distance, a flow of energy occurs. The electric potential energy in the atmosphere then is transformed into thermal energy, light, and sound, which are other forms of energy.

Energy Introduction

  Energy is a very common term. Without energy we cannot do any work. Energy is the considered as the tool for doing work. The energy is present in various forms in various place. There is a law formulated for the conservation of the energy. The energy is measured by using the unit joule. The unit of the energy and the unit of work are same.

Forms of Energy

Various forms of energy:

  •  Mechanical energy
  • Heat energy
  • Chemical energy
  • Light energy
  • Sound energy
  • Electrical energy
  • Solar energy
  • Magnetic energy

Mechanical energy:

                Mechanical energy is the energy possessed by vitue of  motion of the body. There are two parts in the mechanical energy kinetic energy and potential energy. Kinetic energy is the form of energy possessed by the motion of the body. Potential energy is possessed by the vitue of its position. Mechanical energy is the energy obtained by the sum of both the potential and kinetic energy.

Heat energy:

                Heat energy is the energy possessed by the hot body when it feels hotness. It is one of the various forms of energy.  

Chemical energy:

                It is one of the various forms of energy.  Chemical energy is the energy possessed from the fuels and domestic gas. This is used as conservation for running vehicles.

Light energy:

                Energy which posses the sensation for seeing the objects is referred as light energy. This is also one of the various forms of energy.

Sound energy:

            Energy which posses the sensation for hearing the sound is referred as sound energy.

Electrical energy:

                Energy which is carried out by electric current is referred as electrical energy.

Solar energy;

                Energy which is radiated from the sun is defined as solar energy.

Magnetic energy:

                The magnetic field is produced around the magnet. Energy which is stored by the magnetic field is referred as magnetic energy.

Law of Conservation of Energy

Law of conservation of energy:                             

                The total amount of energy in the isolated system is maintained as constant when energy is transformed from one form to another. The law of conservation of energy is defined as,

                Energy cannot be created or destroyed but it can be transformed the energy from one form to another form.

                The law of conservation of energy is based on the experience. The energy which is defined here must be considered for experiencing the law of conservation of energy. In alternative the law of conservation is defined as, In universe the total energy remains constant.  

Work Power and Energy

A person goes to his office by walk, sits at his office desk from 10 a.m to 5 p.m ., does his work and then finally returns to his home by walk. But according to physics, he does not do any work sitting in his office. He does work only during his walk to his office and back to his home.

Work is said to be done by a force when a body undergoes displacement parallel to the line of action of the force .

work force energy

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