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 THE LAW OF CONSERVATION OF ENERGY 

Learning Outcomes 

• Understanding the different forms of energy.

• Detailed understanding about the various forms of energy such as heat energy, chemical 

energy, electrical energy, the equivalence of mass and energy and nuclear energy.

• Understanding about the concept and definition of the law of conservation of energy. 

Note

1. Energy exists in various forms such as heat, chemical, electrical, mechanical, nuclear, and 

light etc.

2. Various forms of energy 

• Heat Energy: Energy due to the motion of particles; can be transferred by conduction, 

convection, or radiation.

• Chemical Energy: Stored in chemical bonds; released in chemical reactions (e.g., burning 

fuel).

• Electrical Energy: Due to the movement of electric charges; powers devices and circuits.

• Mass-Energy Equivalence: As per Einstein’s equation E = mc², mass can be converted 

into energy, showing that mass itself is a form of energy.

• Nuclear Energy: Released during nuclear fission or fusion; comes from the nucleus of 

atoms.

3.The law of conservation of energy 

Energy cannot be created or destroyed; it can only be transformed from one form to another or 

transferred from one object to another. The total energy of an isolated system remains constant 

over time.

Self assessment questions 

• List and briefly describe any four forms of energy.

• Define the law of conservation of energy .

• Give two examples of energy transformation in everyday life.

• List out different forms of energies. 

• Energy conversion in fan is ,electrical energy 

to.............

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