Introduction to Incoherent Light Source:
Incoherent light source is any source of light which emit light of several wavelengths or say emit light of several colors shown in the case of the sun which is a best example of incoherent light source. The incoherent light sources are emitting light not only with different wavelengths but it emits light with different frequency and different amplitude and the light waves are out of phase. Different amplitude implies that if one light, emitted by the source has higher intensity than that of the other or say the content of one particular light is greater in the source rather compare to the other component of lights. The phase difference between the different light and say different color implies that if one color is emit at a particular angle than it is not necessary that all other colors present in the light source should have the same angle.
My forthcoming post is on What is the Definition of Light Energy, Work Problems will give you more understanding about physics.
Comparison of Incoherent and Coherent Light Sources
In the coherent light sources any two sources are said to be coherent if they emit light waves of the same frequency and nearly same amplitude and are always in phase with each other. These all properties are not satisfied by an incoherent light source as discussed above.
The coherent light source always exists in pair whereas the incoherent light source exists in single.
The coherent light source can be made using a single incoherent light source but the incoherent light source is generally exists in the nature.
Most of the light sources exist in the general life are incoherent whereas the coherent light sources are made in laboratory under specific conditions.
Conclusion for Incoherent Sources of Light
As per the discussion, we see that, when we observe the interference pattern of a coherent light source it shows a series of dark and bright bands with equal width on the both sides of the central band which either dark or bright but in case of the incoherent light source the interference pattern show mostly the central band as bright and the bands appears on the both side of it might be colored or dark and bright but the width of the bands is not equal.
Thursday, June 6, 2013
Stream Energy
Introduction to steam energy:
There are two types of energy in nature i.e. conventional and non-conventional sources. Conventional sources of energy includes those sources of energy which derived from fossil-fuels. It includes petroleum, natural gas, diesel, etc. Non- conventional sources includes those sources which are gift of nature and available free of cost to us. Such as Hydro energy, solar energy, Wind energy, Thermal energy. Geo-thermal energy etc. One of them is "Stream energy". Steam energy refers to the form of the energy which is derived from the motion of water or wind. When water/wind is allowed to move at certain pace, it acquires tremendous energy due to its motion i.e. kinetic energy. Mainly, it is Kinetic energy, be it is in water or wind, which causes it to do work.
Looking out for more help on Gas to Solid Phase Change in physics by visiting listed websites.
Cause of Stream energy
Energy in stream is stored in the form of heat and pressure. When water or wind molecule is flowing, the electrons start to move at high speed. This moving molecule of water takes to the air because of its quickly moving electrons. This moving water molecule keeps away from other water/wind molecules. This distance gives rise to pressure. When this task of moving wind/water is performed at large scale, enormous amount of pressure is built. When this pressure is released, energy can be generated. This energy is known as Stream Energy. Is this topic Equation for Kinetic Energy hard for you? Watch out for my coming posts.
Uses of stream energy:
Stream energy has industrial, agricultural and house hold uses. Stream energy is used in industries for power generation. The transfer of energy from the steam to the object causes it to move. Stream energy produced is used to rotate the turbine, which in turns rotates shaft of the generator. Thus, electricity is produced. However there are certain limitations regarding the uses of stream energy. It can be used only under certain conditions and at certain places where there is ample scope of its availability. The geographical location of the place is a varying factor for the use of stream energy.
There are two types of energy in nature i.e. conventional and non-conventional sources. Conventional sources of energy includes those sources of energy which derived from fossil-fuels. It includes petroleum, natural gas, diesel, etc. Non- conventional sources includes those sources which are gift of nature and available free of cost to us. Such as Hydro energy, solar energy, Wind energy, Thermal energy. Geo-thermal energy etc. One of them is "Stream energy". Steam energy refers to the form of the energy which is derived from the motion of water or wind. When water/wind is allowed to move at certain pace, it acquires tremendous energy due to its motion i.e. kinetic energy. Mainly, it is Kinetic energy, be it is in water or wind, which causes it to do work.
Looking out for more help on Gas to Solid Phase Change in physics by visiting listed websites.
Cause of Stream energy
Energy in stream is stored in the form of heat and pressure. When water or wind molecule is flowing, the electrons start to move at high speed. This moving molecule of water takes to the air because of its quickly moving electrons. This moving water molecule keeps away from other water/wind molecules. This distance gives rise to pressure. When this task of moving wind/water is performed at large scale, enormous amount of pressure is built. When this pressure is released, energy can be generated. This energy is known as Stream Energy. Is this topic Equation for Kinetic Energy hard for you? Watch out for my coming posts.
Uses of stream energy:
Stream energy has industrial, agricultural and house hold uses. Stream energy is used in industries for power generation. The transfer of energy from the steam to the object causes it to move. Stream energy produced is used to rotate the turbine, which in turns rotates shaft of the generator. Thus, electricity is produced. However there are certain limitations regarding the uses of stream energy. It can be used only under certain conditions and at certain places where there is ample scope of its availability. The geographical location of the place is a varying factor for the use of stream energy.
Reflection Theory
Introduction to Reflection Theory:
When a beam of light is incident on a surface,a part of it is returned back into the same medium.The part of light which is returned back into the same medium is called the reflected light.Thus,
The return of light into the same medium after striking a surface is called reflection.
Please express your views of this topic What is Light made of by commenting on blog.
Theory of Reflection:
Reflection of light is the process which enables us to see different objects around us. Luminous bodies are directly seen,but non-luminous objects are seen only because they reflect the light incident on them.The reflected light on entering into our eyes,make them visible.
Different surface reflect light to different extents.A highly polished and smooth surface,such as plane mirror,reflects almost the entire light falling on it.
A plane mirror is made by silvering one side of a plane.The surface which is silvered,is called the silvered surface,while the other surface of glass plate is called the reflecting surface from where light is reflected.
Understanding specific heat equation is always challenging for me but thanks to all science help websites to help me out.
Kinds of Reflection:
There are usually two kinds of reflection:
1)regular reflection and
2)irregular reflection.
1)Regular reflection:Regular reflection occurs when a beam of light falls on a smooth surface and polished surface,such as a plane mirror.A parallel beam of light is incident on a plane mirror,the reflected beam is also parallel and it is in a fixed direction.This is called the regular reflection.
2)Irregular reflection:Irregular reflection occurs when a beam of light falls on a rough surface such as walls of a room or page of a book etc.The walls of a room or page of a book may appear smooth ,but if it examined under a microscope,it appears quite uneven having many small projections. When light rays strike different parts of a rough surface,the rays are reflected in many different directions and give rise to the diffused or irregular reflections.
When a beam of light is incident on a surface,a part of it is returned back into the same medium.The part of light which is returned back into the same medium is called the reflected light.Thus,
The return of light into the same medium after striking a surface is called reflection.
Please express your views of this topic What is Light made of by commenting on blog.
Theory of Reflection:
Reflection of light is the process which enables us to see different objects around us. Luminous bodies are directly seen,but non-luminous objects are seen only because they reflect the light incident on them.The reflected light on entering into our eyes,make them visible.
Different surface reflect light to different extents.A highly polished and smooth surface,such as plane mirror,reflects almost the entire light falling on it.
A plane mirror is made by silvering one side of a plane.The surface which is silvered,is called the silvered surface,while the other surface of glass plate is called the reflecting surface from where light is reflected.
Understanding specific heat equation is always challenging for me but thanks to all science help websites to help me out.
Kinds of Reflection:
There are usually two kinds of reflection:
1)regular reflection and
2)irregular reflection.
1)Regular reflection:Regular reflection occurs when a beam of light falls on a smooth surface and polished surface,such as a plane mirror.A parallel beam of light is incident on a plane mirror,the reflected beam is also parallel and it is in a fixed direction.This is called the regular reflection.
2)Irregular reflection:Irregular reflection occurs when a beam of light falls on a rough surface such as walls of a room or page of a book etc.The walls of a room or page of a book may appear smooth ,but if it examined under a microscope,it appears quite uneven having many small projections. When light rays strike different parts of a rough surface,the rays are reflected in many different directions and give rise to the diffused or irregular reflections.
Emission and Absorption Spectra
Spectra are mainly classified as emission and absorption spectra
Introduction to emission and absorption spectra:
Emission S[spectrum] :
It is the spectrum of light emitted by a substance. Emission spectra are of three different types
1) Continuous Spectrum : It is a spectrum that appears as an unbroken continuous band of colours from red at one end to violet at the other end. In such a spectrum we can not say where one colour ends and the other colour starts. A continuous spectrum is emitted when a solid or liquid is heated to very high temperatures. It is due to the thermal excitation of the molecules of the substance. Its examples are solar spectrum, carbon are spectrum, spectrum of light emitted by an incandescent bulb etc. Having problem with Units of Angular Momentum keep reading my upcoming posts, i will try to help you.
2) Band Spectrum : A spectrum in which different colours appear as bands separated by dark spaces is called band spectrum. Each band is sharply defined at one edge called head of teh band and fading off gradually at the other edge. When a band is observed by an instrument of high resolving power, it is found that each band consists of a large number of fine lines. The band spectrum is due to the excitation of the molecules of an element or a compound. Its examples are the spectra of CO2 , N2 obtained by filling the gas at low pressure in a discharge tube and passing electricity through it, the spectrum of the light emitted by Bunsen flame etc.
3) Line Spectrum : It is a spectrum of bright lines separated by dark spaces. The line spectrum is due to the excitation of the atoms of an element. A line spectrum is obtained when electrons excited to higher energy states make transition to lower energy states as explained by Bohr's theory of atomic structure. Some of the examples are the spectrum of the light emitted by hydrogen in a gaseous discharge tube, mercury vapour lamp, sodium vapour lamp, the spectrum of the light emitted by salt solutions of sodium, lithium, potassium, barium, calcium etc, placed in the non-luminous portion of Bunsen flame.
Is this topic Frequency Formula hard for you? Watch out for my coming posts.
Absorption spectra: emission and absorption spectra
When an absorbing substance is introduced between a source emitting continuous spectrum and a spectroscope it is found that some regions of the continuous spectrum are missing. This is due to absorption of light. Generally absorption occurs whenever light passes through any transparent substance. In addition, certain substances strongly absorb light corresponding to certain parts of the spectrum which is called selective absorption.
Absorption spectrum : The spectrum of the light absorbed by a substance due to selective absorption is called absorption spectrum. Absorption spectra are of two types.
1) Line Spectrum : When while light from an incandescent electric bulb is sent through a Bunsen flame fed with sodium salt, the transmitted light is found to be a continuous spectrum crossed by two close dark lines. These dark lines lie exactly in the same position as the emission lines of sodium and constitute the line absorption spectrum of sodium vapour. Line absorption spectrum of an element is obtained when the temperature of the source of light is higher than that of the atomic vapour through which it passes.
2) Band Spectrum : The absorption spectrum in the form of groups or bands of closely spaced lines is called band absorption spectrum. It is characteristic of molecular gases and chemical compounds. In face molecular spectrum is better studied in absorption spectrum.
Introduction to emission and absorption spectra:
Emission S[spectrum] :
It is the spectrum of light emitted by a substance. Emission spectra are of three different types
1) Continuous Spectrum : It is a spectrum that appears as an unbroken continuous band of colours from red at one end to violet at the other end. In such a spectrum we can not say where one colour ends and the other colour starts. A continuous spectrum is emitted when a solid or liquid is heated to very high temperatures. It is due to the thermal excitation of the molecules of the substance. Its examples are solar spectrum, carbon are spectrum, spectrum of light emitted by an incandescent bulb etc. Having problem with Units of Angular Momentum keep reading my upcoming posts, i will try to help you.
2) Band Spectrum : A spectrum in which different colours appear as bands separated by dark spaces is called band spectrum. Each band is sharply defined at one edge called head of teh band and fading off gradually at the other edge. When a band is observed by an instrument of high resolving power, it is found that each band consists of a large number of fine lines. The band spectrum is due to the excitation of the molecules of an element or a compound. Its examples are the spectra of CO2 , N2 obtained by filling the gas at low pressure in a discharge tube and passing electricity through it, the spectrum of the light emitted by Bunsen flame etc.
3) Line Spectrum : It is a spectrum of bright lines separated by dark spaces. The line spectrum is due to the excitation of the atoms of an element. A line spectrum is obtained when electrons excited to higher energy states make transition to lower energy states as explained by Bohr's theory of atomic structure. Some of the examples are the spectrum of the light emitted by hydrogen in a gaseous discharge tube, mercury vapour lamp, sodium vapour lamp, the spectrum of the light emitted by salt solutions of sodium, lithium, potassium, barium, calcium etc, placed in the non-luminous portion of Bunsen flame.
Is this topic Frequency Formula hard for you? Watch out for my coming posts.
Absorption spectra: emission and absorption spectra
When an absorbing substance is introduced between a source emitting continuous spectrum and a spectroscope it is found that some regions of the continuous spectrum are missing. This is due to absorption of light. Generally absorption occurs whenever light passes through any transparent substance. In addition, certain substances strongly absorb light corresponding to certain parts of the spectrum which is called selective absorption.
Absorption spectrum : The spectrum of the light absorbed by a substance due to selective absorption is called absorption spectrum. Absorption spectra are of two types.
1) Line Spectrum : When while light from an incandescent electric bulb is sent through a Bunsen flame fed with sodium salt, the transmitted light is found to be a continuous spectrum crossed by two close dark lines. These dark lines lie exactly in the same position as the emission lines of sodium and constitute the line absorption spectrum of sodium vapour. Line absorption spectrum of an element is obtained when the temperature of the source of light is higher than that of the atomic vapour through which it passes.
2) Band Spectrum : The absorption spectrum in the form of groups or bands of closely spaced lines is called band absorption spectrum. It is characteristic of molecular gases and chemical compounds. In face molecular spectrum is better studied in absorption spectrum.
Law of Gravitational Attraction
The law of gravitational attraction was proposed by Sir Isaac Newton in order to understand planetary motion around the planets. In this article we shall discuss the statement of the law.
Introduction to Law of Gravitational Attraction
“Everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them”
Mathematically, we can state this as:
F = G Mm/r^2
Where F is the magnitude of the attracted force between two bodies of masses M and m, separated by a distance r.
Please express your views of this topic Gravitational Acceleration Formula by commenting on blog.
Law of Gravitational Attraction
For the gravitational force between an extended object (like the earth) and a point mass, is not directly applicable. Each point marks in the extended object will exert a force on the given point mass and these force will not all be in the same direction. We have to add up these force vectorially for all the point masses in the extended object to get the total force. This is easily done using calculus. For two special cases, a simple law results when you do that:
1. The force of attraction between a hollow spherical shell of uniform density and a point mass situated outside is just as if the entire mass of the shell is concentrated at the centre of the shell. Qualitatively can be understood as follows:
Gravitational forces caused by the various regions of the shell have component alone the line joining the point mass to the centre as well as along a direction perpendicular to this line. The component perpendicular to this line cancel out when summing over all regions of the shell leaving only a resultant force along the line joining the point to the centre.
2. The force of attraction due to a hollow spherical shell of uniform density, on a point mass situated inside it is zero. Qualitatively, we can again understand this result. Various regions of the spherical shell attract the point mass it in various directions. These forces cancel each other completely.
Is this topic Momentum Equation hard for you? Watch out for my coming posts.
The Law of gravitational Attraction : Summary
The law of gravitation is strictly true for point masses. If the bodies are far apart, i.e. the distance between them is much greater than their sizes, then to a good approximation one may take r in to be the distance between there centers of mass. The gravitational force is a conservative force.
Introduction to Law of Gravitational Attraction
“Everybody in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them”
Mathematically, we can state this as:
F = G Mm/r^2
Where F is the magnitude of the attracted force between two bodies of masses M and m, separated by a distance r.
Please express your views of this topic Gravitational Acceleration Formula by commenting on blog.
Law of Gravitational Attraction
For the gravitational force between an extended object (like the earth) and a point mass, is not directly applicable. Each point marks in the extended object will exert a force on the given point mass and these force will not all be in the same direction. We have to add up these force vectorially for all the point masses in the extended object to get the total force. This is easily done using calculus. For two special cases, a simple law results when you do that:
1. The force of attraction between a hollow spherical shell of uniform density and a point mass situated outside is just as if the entire mass of the shell is concentrated at the centre of the shell. Qualitatively can be understood as follows:
Gravitational forces caused by the various regions of the shell have component alone the line joining the point mass to the centre as well as along a direction perpendicular to this line. The component perpendicular to this line cancel out when summing over all regions of the shell leaving only a resultant force along the line joining the point to the centre.
2. The force of attraction due to a hollow spherical shell of uniform density, on a point mass situated inside it is zero. Qualitatively, we can again understand this result. Various regions of the spherical shell attract the point mass it in various directions. These forces cancel each other completely.
Is this topic Momentum Equation hard for you? Watch out for my coming posts.
The Law of gravitational Attraction : Summary
The law of gravitation is strictly true for point masses. If the bodies are far apart, i.e. the distance between them is much greater than their sizes, then to a good approximation one may take r in to be the distance between there centers of mass. The gravitational force is a conservative force.
Monday, June 3, 2013
Wind Generator
Introduction to wind generator:
Wind generator: It is a device used for generating electricity by using power of wind. Let us go into the details of generator and how electricity is generated.
Electric generator: The device used for converting mechanical energy into electrical energy is called electric generator. The mechanical energy can be in the form of wind power , hydro power , coal power , nuclear power etc.Please express your views of this topic Electric and Magnetic Fields by commenting on blog.
Components of electric generator:
Components of electric generator:-
(1) Magnetic field
(2) Armature Coil
(3) Mover
(4) Rotor
(5) Slip Rings
(6) Stators
I have recently faced lot of problem while learning Momentum Equation, But thank to online resources of science which helped me to learn myself easily on net.
Wind generator :
Magnetic Field – It is supplied by coils placed in the generator which get feed of current from a source.
Armature coil – It consists of a large number of coils wounded together. It is the current carrying member of the generator and here voltage is produced.
Mover – It is the external source which moves the generator such as wind power, hydropower, coal power etc .
Rotor – The component, which rotates with in the generator, is called rotor.
It gets the driving power from the mover of the generator.
Slip Rings – These are the circular conducting parts of a generator and are used to transfer electric power to external agency.
Stators- The stationary parts of a generator are called stators.
A wind generator has a wind turbine attached to it. It acts as a propeller for the generator and it rotates the rotor. The rotating rotor changes electric flux linked with the armature coil. The change in flux linked with the armature coil produces electric voltage and thus electric current is produced.
Some of Advantages of wing generator is that it produces clean energy , without any pollution and polluting wastes. More over is utilizes naturally produced wind power , which if untapped results in wastage of natural power.
Some of the disadvantages is that it need a lot of space for setting up windmills.
It can be concluded that new technological advancements are required for setting up wind generators in small area
Wind generator: It is a device used for generating electricity by using power of wind. Let us go into the details of generator and how electricity is generated.
Electric generator: The device used for converting mechanical energy into electrical energy is called electric generator. The mechanical energy can be in the form of wind power , hydro power , coal power , nuclear power etc.Please express your views of this topic Electric and Magnetic Fields by commenting on blog.
Components of electric generator:
Components of electric generator:-
(1) Magnetic field
(2) Armature Coil
(3) Mover
(4) Rotor
(5) Slip Rings
(6) Stators
I have recently faced lot of problem while learning Momentum Equation, But thank to online resources of science which helped me to learn myself easily on net.
Wind generator :
Magnetic Field – It is supplied by coils placed in the generator which get feed of current from a source.
Armature coil – It consists of a large number of coils wounded together. It is the current carrying member of the generator and here voltage is produced.
Mover – It is the external source which moves the generator such as wind power, hydropower, coal power etc .
Rotor – The component, which rotates with in the generator, is called rotor.
It gets the driving power from the mover of the generator.
Slip Rings – These are the circular conducting parts of a generator and are used to transfer electric power to external agency.
Stators- The stationary parts of a generator are called stators.
A wind generator has a wind turbine attached to it. It acts as a propeller for the generator and it rotates the rotor. The rotating rotor changes electric flux linked with the armature coil. The change in flux linked with the armature coil produces electric voltage and thus electric current is produced.
Some of Advantages of wing generator is that it produces clean energy , without any pollution and polluting wastes. More over is utilizes naturally produced wind power , which if untapped results in wastage of natural power.
Some of the disadvantages is that it need a lot of space for setting up windmills.
It can be concluded that new technological advancements are required for setting up wind generators in small area
Sunday, June 2, 2013
5 Renewable Resources
Introduction to 5 renewable resources:
The natural resources such as sunlight, rain,geothermal heat, wind, tides etc generates the energy that can be renewable. About 19% of the global final energy consumption will come from these renewable resources. In that 19%, about 13% of the total energy coming from the biomass that is through biological processes which are used mainly for the heating purpose and about 3.2% of total energy coming from hydro power electricity. New renewable resources are used now a days such as modern biomass, wind, small hydro, solar, geothermal and bio fuels. These resources contributes for about another 2.7% of the total energy and are growing very rapidly. About 18% of the total renewable energy that is used for the generation of the electricity. About 15% of the global electricity is coming from the hydro power electricity and about 3% from the new renewable resources.Please express your views of this topic Definition of Light Energy by commenting on blog.
Some renewable resources
Wind power: The wind turbines runs with the help of the wind. Modern wind turbines ranges from around 600 kW to 5 MW of rated power, turbines with rated output of 1.5MW to 3 MW which has became a commercial use. Areas where there are stronger winds and are constant such as high altitude areas and these areas are the preferred locations for the wind farms which generates the electricity by using the wind called as wind energy.
Hydro power: Energy that can be produced from water that is stored in dams is called hydroelectric energy. Water in the dams can be harnessed and then they are used to generate the electricity. Water is used for this purpose because water is about 800 times more denser than that of air. Even in a slow flowing stream of water we can generate the considerable amount of hydro electric energy.
Solar energy: Solar energy is the energy that is derived directly from the sun in the form of solar radiations coming from sun. Some of the solar products are solar cooking, solar hot water, day lighting, space cooling and heating through solar architecture.
Is this topic specific heat equation hard for you? Watch out for my coming posts.
More renewable resources
Biomass: Biomass which is a plant material is a type of renewable energy source where the energy comes from the sun. Plants capture the sun's energy through the process of photosynthesis. When we burn plants, the plants release the energy which the plants contain.
Biofuel: Liquid biofuel is a bioalcohol such as bioethanol or an oil such as biodiesel. Of the world’s transport fuel about 1.8% is provided by biofuels.
Geothermal energy: Geothermal energy is the energy that is used for generating the electricity from the steam that is produced by the water present inside the earth. When that water gets heated up this energy is generated and we use this energy as geothermal energy.
The natural resources such as sunlight, rain,geothermal heat, wind, tides etc generates the energy that can be renewable. About 19% of the global final energy consumption will come from these renewable resources. In that 19%, about 13% of the total energy coming from the biomass that is through biological processes which are used mainly for the heating purpose and about 3.2% of total energy coming from hydro power electricity. New renewable resources are used now a days such as modern biomass, wind, small hydro, solar, geothermal and bio fuels. These resources contributes for about another 2.7% of the total energy and are growing very rapidly. About 18% of the total renewable energy that is used for the generation of the electricity. About 15% of the global electricity is coming from the hydro power electricity and about 3% from the new renewable resources.Please express your views of this topic Definition of Light Energy by commenting on blog.
Some renewable resources
Wind power: The wind turbines runs with the help of the wind. Modern wind turbines ranges from around 600 kW to 5 MW of rated power, turbines with rated output of 1.5MW to 3 MW which has became a commercial use. Areas where there are stronger winds and are constant such as high altitude areas and these areas are the preferred locations for the wind farms which generates the electricity by using the wind called as wind energy.
Hydro power: Energy that can be produced from water that is stored in dams is called hydroelectric energy. Water in the dams can be harnessed and then they are used to generate the electricity. Water is used for this purpose because water is about 800 times more denser than that of air. Even in a slow flowing stream of water we can generate the considerable amount of hydro electric energy.
Solar energy: Solar energy is the energy that is derived directly from the sun in the form of solar radiations coming from sun. Some of the solar products are solar cooking, solar hot water, day lighting, space cooling and heating through solar architecture.
Is this topic specific heat equation hard for you? Watch out for my coming posts.
More renewable resources
Biomass: Biomass which is a plant material is a type of renewable energy source where the energy comes from the sun. Plants capture the sun's energy through the process of photosynthesis. When we burn plants, the plants release the energy which the plants contain.
Biofuel: Liquid biofuel is a bioalcohol such as bioethanol or an oil such as biodiesel. Of the world’s transport fuel about 1.8% is provided by biofuels.
Geothermal energy: Geothermal energy is the energy that is used for generating the electricity from the steam that is produced by the water present inside the earth. When that water gets heated up this energy is generated and we use this energy as geothermal energy.
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