Sources of Energy
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Energy can neither be created nor destroyed. Then why is there so much fuss about energy crisis?

It is true that energy can neither be created no be destroyed but, is converted to one form of energy to another. The fuss because of the fact that, energy in the usable form is dissipated to the surroundings in the less usable form.

For instance, when a candle burns it gives heat, light and other substances but the heat, light and these other substances cannot be put together to give wax to be used again. 
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    What is meant by a source of energy?
    Answer

    Name the source of energy in sun and stars.

    Answer

    What are the characteristics of a good source of energy?

    Answer

    List any four sources of energy which are selected for use for a given activity. 

    1. Energy to run a cycle
    2. Energy to run a car
    3. Energy to cook food 
    4. Energy to work on 

    Answer
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