Here are some examples of energy transformations taking place in our daily life
Electric Motors
This is used in different appliances like fans, refrigerators etc
Here Electrical energy is converted into Kinetic Energy
Electrical Energy → Kinetic Energy
Electric Generator
It is used to generate electricity
Here, Mechanical Energy is converted into electrical energy
Mechanical Energy → Electrical Energy
Electric iron
It is used to iron clothes.
Here, electrical is converted into heat energy.
Electrical energy → Heat energy
Electric Bulb
It is used to produce light.
Here, electrical energy is converted into heat energy which is then converted into light energy.
Electrical energy → Heat energy → Light energy
Note : In case of a CFL , the electrical energy is directly converted into light energy and hence there is no wastage of energy. Therefore, CFLs are preferred.
Radio
It is used to listen to songs or news.
Here, electrical energy is converted into kinetic energy which is then converted into sound energy.
Electrical energy → Kinetic energy → Sound energy
Steam Engine
It is used to run trains.
Here, heat energy is converted into kinetic energy.
Heat energy → Kinetic energy
Car engine
It used used to run cars
Here, chemical energy is converted into heat energy which is then converted into kinetic energy.
Chemical energy → Heat energy → Kinetic energy
Cell
It is used in many electronics.
Here, chemical energy is converted into electrical energy.
Chemical energy → Electrical energy
Gas Stove
It is used to cook food.
Here, chemical energy is converted into heat energy.
Chemical energy → Heat energy
Solar water heater
It is used to warm water.
Here, light energy is converted into heat energy.
Light energy → Heat energy
Solar cell
It is used to provide electricity.
Here, light energy is converted into electrical energy.
Light energy → Electrical energy
Questions
NCERT Question 3 - A battery lights a bulb. Describe the energy changes involved in the process.
NCERT Question 7 - What are the various energy transformations that occur when you are riding a bicycle?
NCERT Question 8 - Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
