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CBSE NOTES ⇒ Class 10th ⇒ Science ⇒ 14. Sources of Energy

14. Sources of Energy


14. Sources of Energy


The law of conservation of energy: 

Energy can niether be created nor be distroyed, It can only be transformed into one form to another form. 


  • The total energy during a physical or chemical process is conserved.
  • 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.
  • Eenergy, in the usable form, is dissipated to the surroundings in less usable forms. Hence, any source of energy we use, to do work, is consumed and cannot be used again.

Good Fuels: Fuels which would do a large amount of work per unit volume or mass, be easily accessible and be easy to store and transport are called good fuels. 

Properties of good fuels: 

(i) Which produce less pollutants. 

(ii) which would do a large amount of work per unit volume or mass.

(iii) Which are easily accessible. 

(iv) Which are easy to store and transport.

(v) Which are economicals. 




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Study Materials List:

CBSE NOTES ⇒ Class 10th ⇒ Science
1. Chemical Reactions and Equations
2. Acids, Bases and Salts
3. Metals and Non-metals
4. Carbon and its Compounds
5. Periodic Classification of Elements
6. Life Processes
7. Control and Coordination
8. How do Organisms Reproduce
9. Heredity and Evolution
10. Light-Reflection and Refraction
11. Human Eye and Colourful World
12. Electricity
13. Magnetic Effects of Electric Current
14. Sources of Energy
15. Our Environment
16. Management of Natural Resources

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