Sources of Energy for NCERT class 10 Science

Sources of Energy


In this chapter we will learn about how different types of energy is produced

  • We know that energy can neither be created nor be destroyed it can only be transformed from one form to another.
  • Energy comes in different forms and one form can be converted to another.
  • For example, if we drop a plate from a height, the potential energy of the plate is converted mostly to sound energy when it hits the ground.
  • If we light a candle, the process is highly exothermic so that the chemical energy in the wax is converted to heat energy and light energy on burning.
  • The total energy during a physical or chemical process remains the same.


  • We, in our daily lives, use energy from various sources for doing work. We use diesel to run our trains.
  • We use electricity to light our street-lamps. Or we use energy in our muscles to cycle to school.The muscular energy for carrying out physical work, electrical energy for running various appliances, chemical energy for cooking food or running a vehicle all come from some source.
  • We need to know how do we select the source needed for obtaining the energy in its usable form.
  • We have to be wise while selecting a source of energy. We have to think about future generation and mainly the environmental effects associated with it.
    For example, while selecting a fuel, we would ask ourselves the following questions
    (i) How much heat does it release on burning?
    (ii) Does it produce a lot of smoke?
    (iii) Is it easily available?

We could then say that a good source of energy would be one

  • which would do a large amount of work per unit volume or mass,
  • be easily accessible, n be easy to store and transport, and
  • perhaps most importantly, be economical.

now we will learn about different types of conventional sources of energy.

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