To start with, it is important to note that energy is neither created nor destroyed, it only changes forms. Ultimately we i.e. human use energy for whatever ways we can and using alternatives sources to meet demands. Consumption of energy is a huge part of our day to day living. We eat with energy, we travel with energy, we work with energy and many more. This makes the availability of energy very necessary for humans.
Energy means the capacity to do work. It exists in various forms such as mechanical energy, kinetic energy, potential energy, sound energy, etc. It just changes its types, for example when we burn fuel inside a bike or a car the chemical energy of the fuel gets converted into heat energy which in turn, converted into mechanical power that turns the wheels of the vehicle, when we eat food the photosynthetic energy that plant produces by sun stored in plants comes to living organism in the form of chemical energy and get distributed in food webs.
Energy is used for the following purposes:
- Residential sector- We make use of energy for domestic purpose e.g. Cooking food, heating water, other electrical appliances and for sure the domestic work includes mechanical and muscular energy.
- Commercial sector- Use of energy in the commercial sector includes heating, cooling and lighting of commercial buildings and machines.
- Transport sector- This sector own hundred per cent dependence on energy. Nearly seventy per cent of petroleum and other fuels like diesel go into the transport sector. Without fuel, transport section has no importance but the transport sector gives a lot of contribution to air pollution through the pollutants present in the smoke that is emitted out during the burning of fuel.
- Industrial sector- This sector uses energy for a wide range of purposes, such as steam and cogeneration, process heating and cooling, lightning, heating and air conditioning for buildings
Today, most energy sources for doing work are non-renewable energy sources, these includes:
- Petroleum oil
- Natural gas
- Coal
- Nuclear energy
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