This article will help you to understand the basic concept of Energy, Energy sources and How different forms of energy change to electrical energy. In the below link, you will get a pdf copy were briefly described-

Generation of Electrical Energy;
Sources of Energy;

Comparison of Energy Sources;

Relationship Among Energy Units;

Calorific Value of Fuels;
Advantages of Liquid Fuels Over Solid Fuels, &

Advantages of Solid Fuels Over Liquid Fuels.


Basic Concept of Energy: 

We are surrounded by Energy.  Energy is everywhere and it surrounds us; but we can’t touch it and also can’t measure its mass, because it is massless. However, we can see and feel the effects of energy on many materials. The word energy came from the Greek Energeia, meaning in or at work.

Energy is the ability or capability to do work; Energy cannot be created or destroyed.

We cannot create or destroy any energy, for our use we only can change the form or state of energy from one into another.

In the language of physical science, energy means the ability or capability to do work.  Work means a change in position, speed, state, or form of matter.  Therefore, energy is the capacity to change matter.

According to the law of conservation of energy, the total energy of a system remains constant, though energy may transform into another form. Two billiard balls colliding, for example, may come to rest, with the resulting energy becoming sound and perhaps a bit of heat at the point of collision.

In fact, everything that happens in the universe, from the eruption of volcanoes to the sprouting of seeds, to the moving of people, takes energy.  When we turn on a motor, drive a car, cook on a stove or switch on a light, we are using energy.

Energy calculation:

The amount of energy is directly proportional to the mass of the body:

E= mC2


m  is the mass,

c  is the speed of light in a vacuum,

E  is the rest mass-energy.

Generation of Electrical Power

The conversion of energy available in different forms in nature into electrical energy is known as the generation of electrical energy or electrical power. Energy is available in various forms from different natural sources such as pressure head of water, the chemical energy of fuels, nuclear energy of radioactive substances etc. which usually changes into electrical power in different ways.

Electrical energy is superior to all other forms of energy due to the following reasons:
  1. Convenient form;
  2. Easy control;
  3. Greater flexibility;
  4. Cheapness;
  5. Cleanliness;
  6. High transmission efficiency.

The major sources of electrical energy is as below:

(I) The Sun
(ii) The Wind
(iii) Water
(iv) Fuels
(v) Nuclear energy

Energy exists in different forms in nature but the most important form is electrical energy. Modern society is so much dependent upon the use of electrical energy that it has become a part and parcel of our life.

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