Different types of energy and energy uses

                                    Types of Energy

1.Mechanical energy

                 Water stored in dam, flowing river, moving bus, galloping horse, a freely stone, and water stored in a tank possess energy. Water falling from a dam, rotates turbines of a generator and generates electricity.

         Water stored in a dam and water stored in a water tank possess potential energy.

              Similarly moving bus, galloping horse, running water possess kinetic energy.

What is potential energy and kinetic energy?

*The energy possessed by a body by virtue of its position is called Potential energy.

*The energy possessed by a body by virtue of its motion is called kinetic energy. 

*Potential energy and kinetic energy are called mechanical energy.

Mechanical energy uses

*Mechanical energy can bring a moving body to rest or can make a resting body move.

*Wind mill converts wind energy(kinetic energy) into electrical energy.

2. Chemical energy

               Energy released during chemical reaction  is called chemical energy. For example, chemical energy is released due to the chemical reaction taking place when wood, charcoal, petrol etc. are burnt. The food we eat undergoes chemical reaction and releases energy to do work.

Chemical energy uses

*Chemical energy is used for the growth of plants animals.

*A battery or a cell converts chemical energy into electrical energy.

*Chemical energy of a fuel is converted into heat energy and light energy.

3. Electrical energy

                    Do you know why a fan rotates or an electrical bulb glows when we switch on? In an electric bulb, electrical energy is converted into light energy and in an electric fan electrical energy is converted into mechanical energy. In thermal power station heat (thermal) energy, obtained by burning coal is converted into electrical energy. In wind mill, the wind energy (kinetic energy) is converted into electrical energy.

Uses

*In industries, electrical energy is used to operate machines. Electrical energy is also used in telecommunication 

*In cities, electrical energy is used to run electric trains.

4. Heat energy

                  Do you know the primary source of heat energy? It is the Sun. In your home do you use wood or cooking gas for cooking? What energy is released when you burn wood or cooking gas?

                    The chemical energy stored in wood and cooking gas is converted into heat energy. due to friction and chemical reaction heat energy is produced.

Uses

           The heat energy obtained from coal is used for generating electrical energy. The heat energy obtained from petrol and diesel is used to run vehicles.

5. Solar energy 

              The energy obtained from the Sun is called solar energy. 

Uses

*Solar energy is directly used in solar heater, solar cooker, street light etc.

*Solar cells are used in artificial satellites and calculators.

*Solar energy is used to operate solar vehicles.