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25,935 | solar energy: the sun is the main source of energy for all living beings on this earth |
25,936 | even the energy in the fossil fuels has come from the sun |
25,937 | the sun has an endless reservoir of energy which would be available as long as the solar system is in existence |
25,938 | technologies for harnessing the solar energy have been developed in recent times |
25,939 | solar cooker: solar cooker is very simple in design and mode of function |
25,940 | the light reflected from the plain mirrors concentrates the solar energy inside the solar cooker which generates enough heat to cook food |
25,941 | large solar furnace has many smaller mirrors to compose a very large convex mirror |
25,942 | the thing to be heated is placed near the focus of the mirror |
25,943 | the solar panel converts solar energy into electrical energy which is stored in a battery; for later use |
25,944 | limitations of solar energy: the technologies for harnessing solar energy are at a nascent stage |
25,945 | at present, the cost-benefit ratio for using solar energy is not conducive |
25,946 | tidal energy: due to the gravitational pull of the moon, tides happen near seashores |
25,947 | water rushes up near the seashore during high tide and goes down during low tide |
25,948 | dams are built near seashores to collect the water which comes during a high tide |
25,949 | when the water runs back to the ocean, the flow of water can be utilized to generate electricity |
25,950 | wave energy: waves can also be a good source of energy |
25,951 | many devices are being designed and tested to produce wave energy |
25,952 | when water gushes in the tube because of wave, it forces the air upwards |
25,953 | the kinetic energy of air in the tube is used to run a turbine |
25,954 | when the wave goes down; air from up goes down the tube which is also used in running the turbine |
25,955 | ocean thermal energy: the water at sea surface is hot during the daytime, while the water at a lower level is cold |
25,956 | the temperature differential in water levels can be utilized to generate energy |
25,957 | if the temperature differential is more than 20掳c, then ocean thermal energy can be utilized from that place |
25,958 | for this, a volatile liquid; like ammonia; is boiled using the heat from the hot water at the surface |
25,959 | the steam of the volatile liquid is utilized to run the turbine to generate electricity |
25,960 | colder water from the surface below is utilized to condense ammonia vapour which is then channelized to the surface to repeat the cycle |
25,961 | geothermal energy: heat energy from molten rocks present inside the earth created under certain favourable conditions by natural processes is called geothermal energy |
25,962 | it is the only type of energy which does not use solar energy |
25,963 | nuclear energy: nuclear fission is the process during which a bigger nucleus breaks to produce two smaller nuclei |
25,964 | nuclear power is safest for the environment but the risk of damage due to accidental leaks of radiation is pretty high |
25,965 | further, the storage of nuclear waste is a big problem because of the potential risk of radiation involved |
25,966 | a very large amount of energy can be produced by a nuclear process on using very small amount of nuclear fuel in a nuclear reactor |
25,967 | the energy so produced can be easily transformed into electrical energy |
25,968 | if you have any query regarding ncert class 10 science notes chapter 14 sources of energy, drop a comment below and we will get back to you at the earliest |