Topic :Energy Resources Designed by Pronoy Roy LPU , Jalandhar, Punjab
The substances from which we produce energy are known asenergy sources. We need energy for our day to day life. Theenergy we use are of two broad categories:1. Renewable source of energy2. Non-renewable source of energy
Fossil fuels constitute most of the energy we use. Only 16.7% of the total energy is renewable energy. The mainconstituent of renewable power source is biomass heat , which constitute 11.44% of the total energy producedworld wide. After that, there is hydro power , which constitute 3.34% of the total power produced worldwide.
The sources of energy that once used , cannot be reused are known asnon-renewable sources of energy. These are the energy sources which are mined from the earth crust. These sources of energy are known as fossil fuels and these took millions of years to form and cannot be regenerated in a matter of years. The rate of consumption far exceeds the rate of production of these resources.These include: Coal Petroleum Natural gas Nuclear fuel
Once used , these fossil fuels are not regenerated in a matter of years. The take millions of years to form. Fossil fuels such as coal and petroleum causes a huge amount of pollution by emitting tons of polluting gases, when combusted. These gases are the main cause of global warming. These energy sources are being exploited at a very fast rate. At this rate, the future generations will not be left with any power source.
The virtually unlimited sources of energy which will not be exhausted in any nearfuture are known as the renewable sources of energy. These energy sources are continuously replenished at a constant rate. About 16.7% of global final energy consumption comes from renewable energy sources.The renewable sources of energy include: Solar power Hydel power Wind energy Tidal energy Geothermal energy Biogas
Solar power is the power derived from the rays of the sun. Solar power can beused in two ways: direct and indirect.In the direct way, sunlight is used to warm water or can be used to cook food using a solar cooker.In the indirect way, sunlight is made incident on solar cells or photo-voltaiccells . Electricity is generated in the circuit which is used to charge batteries.The power stored can be used at any later time.Limitations: Sunlight is not available throughout the year. There are cloudy days as well. The cost of solar cells is very high. The preliminary cost is high but after setting up, electricity is generated for free. Efficiency maximum efficiency of solar cells till date is only 44%.
A solar powered street signalling device outside LPU.
Hydel power is the energy generated by rotatingturbine by the flow of water. Water is collected behinda dam and then the water is allowed to flow to lowpotential , by turning a turbine. It is a clean source ofpower.Limitations:Hydel power requires quick flowing rivers which flowfrom a higher to a lower position.Construction of dams require huge sum of money andit also drowns a significant amount of flora and fauna.
Wind Energy In regions of fast flowing winds, wind turbines are set up , and the wind flow is used to turn turbines which in turn generates electricity. Globally wind energy contributes 0.51% to the global power generation. Limitations: Wind farms require huge amount of unobstructed land. The wind flow should remain constant throughout the year, not seasonal.
It is the energy obtained from the Earth’s crust . Where there is magmanear the surface, cold water is sentthrough a shaft to the heated rocks andthrough another shaft, steam isextracted which is used to turn turbinesto generate electricity.Limitations: Geothermal energy can only be used where the magma layer is near the surface of the surface.
Conclusion Use of fossil fuels should be reduced to quite some extent. The renewable sources of energy should be modified to give the maximum output. Improvement of engines should be encouraged so that minimum resources are required for energy production . The engines should be made more efficient.And last but not the least…… Save electricity and fuel for the future.