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Interconversion of Energy

Grade 7
Jun 2, 2023

Introduction to Interconversion of Energy

In this session, you will learn about the transformation of energy from one form to another with examples from daily life.

Explanation of Energy

We need the energy to do work.

Energy is defined as the capacity or the ability to do work

Energy is a scalar quantity.

Energy = work done = force x displacement

Energy relation

Unit of Energy

Joule is the unit of measurement for work and energy. If we want to perform one Joule of work, one Joule of energy is needed.


Types of Energy

Energy is present in different forms:

  1. Heat energy
  2. Chemical energy
  3. Electrical energy
  4. Sound energy
  5. Light energy
  6. Atomic energy
  7. Nuclear energy
  8. Thermal energy

Transformation of Energy

When energy changes from one form to another form of energy, it is known as the transformation of energy.

This transformation of energy helps us in the utilization of energy as per our need, in the form we need the energy.

A few examples from daily life where the transformation of energy takes place are:

  1. A flashlight converts chemical energy stored in a battery into light energy. 
chemical to light

2. An engine of a vehicle converts chemical energy (petrol or diesel) into kinetic energy

chemical to mechanical

3. Generators convert mechanical energy into electrical energy, while motors can do the opposite, transforming electrical energy into mechanical energy.

mechanical to electrical

4. Every living plant converts light energy, which they get from the sunlight, into chemical energy through the process of photosynthesis.

radiation energy to chemical energy

5. In an electric bulb, the electricity heats the filament of the bulb; when it becomes very hot, it starts producing light. Similarly, in toasters, room heaters, and geysers, the conversion of electrical energy into heat energy takes place.

electrical to thermal

6. A speaker and an alarm clock convert electrical energy into sound energy. 

7. In a grinder, washing machine, and fan, conversion of electrical energy into mechanical energy takes place; as in all these devices, some parts rotate when electricity is supplied to them. They all contain a motor that converts electrical energy into mechanical energy.

8. We human beings get energy from food and do mechanical work. So, the stored chemical energy in the food gets converted into mechanical energy when we do work. We get energy from food after digestion. 

chemical to mechanical

9. A solar cell and solar panel convert solar energy into electrical energy in the presence of sunlight.

Questions and answers

Question 1: Fill in the blanks.


Answer 1:

Interconversion of energy


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