What is energy?

What is energy ? The simple answer to this question is the ability or capacity to perform work. In physics, energy is a property of object which can be transferred to other objects or converted in to different forms. It is not possible to give a general description of energy because of its different forms.

We are live in a world having energy everywhere. Energy is inside as well as outside the body. Air,water,soil,fire and sun are various sources of energy. The source which are extensively used are conventional source and which are not used excessively are non-conventional source of energy. Conventional sources fulfill the major part of the demand of energy and non conventional are alternate sources of energy. Hydro energy, biomass,natural gas, and fossil fuels are conventional sources whereas solar energy, tidal power, and nuclear power. wave energy and geothermal energy are some of the non-conventional sources of energy.