Human beings have the remarkable capability to exploit energy transformation. They first learn to exploit the transformation of chemical energy to heat energy in the form of fire. Later they used the wind energy and energy in flowing water to sail their boats and to run wind and water mills. The use of fossil fuel and the discovery of steam engine were responsible for the Industrial Revolution, which has major economic and environmental implications.

For centuries people have been inventing devices to save human labour, provide entertainment, and make life more comfortable in the desire to improve their quality of life. That trend has led us to depend on a variety of energy consuming machines without which life could be inconceivable. Our society would come to a halt without electricity, automobiles, trains, planes, computers and so on. Today our survival totally depends on three fossil fuels coal, oil and natural gas. In fact per capita consumption of commercial energy is sometimes used as an indicator of economic advancement that a country has attained. As said yearly, India’s per capita consumption of commercial energy is very low. It is only one eighth of the world average.