NCERT 10th Class Science Chapter Sources of Energy

Sources of Energy

    We have a wide range of sources of energy such as the sun, the wind, the earth (geothermal), flowing water, coal, gasoline, diesel, natural gas, biogas, etc. at our disposal. We utilize this energy to perform a wide range of activities, i.e. industrial, commercial, household etc.
    A source of energy is one which can provide adequate amount of energy in a convenient form over a long period of time.


1.    Renewable and nonrenewable sources of energy:

    (a) Renewable Sources of Earth
    Those sources of energy which are being produced continuously in nature and are inexhaustible, are called renewable sources of energy. 
    Example: wood is a renewable source of energy because if trees are cut from the forests for obtaining wood then more trees will grow in the forest in due course of time. 

    The renewable sources of energy are : 
    Examples: Hydroenergy (Energy from flowing water) ; Wind energy ; Solar energy ; Energy from sea (Tidal energy); Sea wave energy and Ocean thermal energy) ; Geothermal energy ; Biomass energy (Energy from bio fuels such as Wood, Bio gas and Alcohol) ; and Hydrogen

    (b) Non- Renewable Sources of Energy
    Those sources of energy which have accumulated in nature over a very, very long time and cannot be quickly replaced when exhausted are called non - renewable sources of energy. 
    Example: coal is a non - renewable source of energy because coal has accumulated in the earth over a very, very long time and if all the coal gets exhausted, it cannot be produced quickly in nature. 

    The non renewable sources of energy are  
    Examples: Fossil fuels (Coal, Petroleum and natural gas) and Nuclear fuels (such as uranium). 
    Non - renewable sources of energy are dug out from the earth.


    The traditional sources of energy which are familiar to most people are called conventional sources of energy. 
    The main conventional sources of energy are wood and fossil fuels (like coal, petroleum and natural gas). 
    The fuels derived from wood, coal and petroleum such as charcoal, coke, coal gas, petrol, diesel, kerosene, fuel oil and liquefied petroleum gas (LPG) are also known as conventional sources of energy.
    (B) Non-conventional sources of energy
    Sources of Energy that we have started using in New ways or Only in Recent times are called alternative sources of energy (or non conventional sources of energy).
    Examples: Hydroelectric energy, Wind energy, Solar energy, Biomass energy, Energy from the sea (Tidal energy, Sea - wave energy, Ocean thermal energy), and Geothermal energy.

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