Renewable And Non-Renewable Sources Of Energy
Transcript
00:00hi kids kids today we will learn what are renewable and non-renewable sources
00:09of energy so let's start we have learned that there are different types of
00:17sources of energy chemical energy nuclear energy stored mechanical energy
00:24gravitational energy sound energy electrical energy now we will learn
00:31which sources of energy are called renewable sources of energy and which
00:39sources of energy are called non-renewable sources of energy let's
00:45first start with renewable sources of energy sources of energy that are easily
00:52replaced by nature and we can keep using them forever that is they will not be
01:00finished over time no matter how much you use them examples of renewable
01:08sources of energy are solar energy wind energy hydro energy and biomass energy
01:18and geothermal energy we just need not use them judiciously they are unlimited
01:28and are all the time being replaced by nature wood fruits vegetables too can be
01:37considered as renewable sources of energy but only if we keep planting them
01:45in big numbers if we are cutting for us we must plant more trees even more than
01:52a number of trees cut down so that new for us is ready in some years
02:03solar energy sunlight is very important source of energy all the plants need
02:11sunlight to grow and give us food wood medicine cotton and much more it's a
02:18direct sunlight that all plants use to produce food and grow we get vitamin D
02:26from this sunlight many types of solar power plants use sunlight to produce
02:32electricity sunlight can be directly used to cook food using solar cookers
02:40and many more devices are there to trap the solar energy and bring it to use
02:46solar energy is clean and free energy and is abundantly available only disadvantage
02:55is that it's not available all the time it's not available 24 hours of the day
03:03and also not 12 months of the year now let's learn wind energy heat from the
03:13Sun that differentially heat the environment of the earth that is the
03:18earth's atmosphere and earth's surface are unevenly heated there are different
03:24temperatures at different places on earth and this difference in temperature
03:29causes warmer air to move up and cooler air to move down and this moving of air
03:37is called wind and this wind energy is trapped to serve various purposes
03:44windmill uses the kinetic energy of the wind to pump the underground water and
03:55to grind grain and big wind turbines use a kinetic energy of the wind to
04:03produce electricity that lights our home and much more so wind energy is another
04:12renewable source of energy on earth and Sun is the driving force behind wind
04:21energy the only disadvantage of wind energy is that the speed of wind keeps
04:28changing so does the wind energy now let's learn hydro energy like wind water
04:38is also always flowing on earth's surface and this flowing water possesses
04:45energy that can be trapped to produce electric energy big dams are created to
04:55trap the potential energy of water and convert this potential energy of water
05:00to kinetic energy of water which is then used to produce electricity next is
05:09biomass energy or the energy stored in dead or living plant and animal matter
05:16plants use a solar energy to grow and produce fruit and this fruits vegetables
05:26all store energy this energy is transferred to those who eat it animals
05:33or humans so the energy is stored in all living organisms living or once
05:41living even the dead remains of the once living things possess energy that is
05:49plants waste and dead decaying animals all have stored energy in them which is
05:55known as bio energy and this biomass energy can be trapped in various ways
06:05burning burning of biomass like wood and other waste from the plant matter
06:11releases energy in the form of heat that can be used to produce electricity
06:19decomposition garbage human and animal waste dead animals all can be left to
06:28rot and that releases a gas called biogas also known as methane gas or
06:37landfill gas and this biogas is a very good fuel which can be used for cooking
06:43and it can be used to produce electricity too now let's learn about
06:49another renewable source of energy and its geothermal energy a lot of energy is
06:58stored beneath the earth's surface in the form of hot molten matter or magma and
07:04this energy can be trapped through various means steam of lava is trapped
07:11and used to run the turbines which in turn produces electricity it's a clean
07:18and sustainable energy this heat energy of molten matter can be trapped from a
07:25few miles beneath the earth's surface using a geothermal heat pump system this
07:33energy can be directly used for heating homes and offices some cities in the US
07:40also pipe this hot water and make an extensive network of pipes under the
07:46roads and sidewalks to melt snow so kids we learned about a lot of renewable
07:54sources of energy now let's learn about non-renewable sources of energy those
08:04sources of energy cannot be replaced by nature in a reasonable timeframe that is
08:11once used nature needs hundreds of thousands of years to replace them for
08:18example if we cut trees to use them new trees can be grown at the same place in
08:25a matter of years it can be 10 years 15 years or 20 years but that's still a
08:36reasonable time frame but fossil fuels that is coal petrol diesel and kerosene
08:44if we use them nature needs thousands or even millions of years to make them a
08:49game earth minerals metal ores fossil fuels even underground water are
08:57examples of non-renewable sources of energy coal is a fossil fuel which is
09:07present beneath the earth's surface and is formed in millions of years it is
09:13extracted through various mines and is used in thermal power plants to produce
09:20electricity organic remains that is remains of plants and animals deep
09:29beneath the earth's surface turns into fossil fuels like natural gas and petrol
09:35and diesel due to the immense pressure and temperature in millions of years
09:42these fossil fuels possess a lot of energy and are used in vehicles and
09:49thermal power plants to produce electricity but we are using them at an
09:56alarming rate and if we continue to use them at this rate they will be vanished
10:02in some years and nature will need millions of years to make them a game
10:09they also have many other disadvantages they pollute the environment cause
10:15global warming so are not good for human health too so kids today we
10:23learned a lot about renewable and non-renewable sources of energy now you
10:30may go ahead and take a quiz to learn more bye-bye