How often do we use energy changes in daily life? Tabulate a few domestic uses of energy. Situation Energy conversions taking place Bulb glowing Working an electric motor to pump water Lighting a match stick Working a mixer grinder Listening to the news on the radio

We divide our energy use among four economic sectors: residential, commercial, transportation, and industrial. Heating and cooling our homes, lighting office buildings, driving cars, and manufacturing the products are all functions that require energy on daily basis. A few domestic uses of energy are as follows: Whenever a bulb glows, it converts electrical energy into heat energy and light energy. The heat energy is generated in the filament and the light energy helps the bulb to glow and produce light. Whenever an electric motor works to pump water it converts electrical energy into mechanical energy due to which the machine is able to work and rotate. Whenever a matchstick is lighted the mechanical energy is converted into heat energy and light energy. A match is rubbed against a surface, the rubbing produces the heat required to light the match. A mixer grinder converts the electrical energy into mechanical energy that helps the blades to rotate which produces heat energy due to continuous motion and light energy can be observed when the small source of light glows. Listening to music on radio uses the electrical energy that is converted into kinetic energy and sound energy. The kinetic energy helps the machine inside radio to move and it produces sound. Situation Energy conversions taking place Bulb glowing Electrical energy → Heat+Light energy Working an electric motor to pump water Electrical energy → Mechanical energy Lighting a match stick Mechanical energy → Heat+Light energy Working a mixer grinder Electrical energy → Mechanical+Heat+Light energy Listening to the news on the radio Electrical energy → Kinetic+Sound energy

Examine the pictures Which situation in the given picture does not use light energy?

Out of boiling water, burning a cracker, and lighting a torch only boiling water does not use light energy. When we boil water chemical energy undergoes a change and is converted into heat energy.

Examine the pictures: In which situation is sound energy produced?

Out of boiling water, burning a cracker, and lighting a torch only burning of cracker produces sound. When we burn a firecracker chemical energy undergoes a change and gets converted into kinetic, heat, light and sound energy.

Examine the pictures: In which situation is heat energy made use of?

Out of boiling water, burning a cracker, and lighting a torch, there are two situations that use heat energy and that are boiling of water and burning of cracker. When we boil water chemical energy undergoes a change and is converted into heat energy. When we burn a firecracker chemical energy undergoes a change and gets converted into kinetic, heat, light and sound energy.

E M B I B E

Science for Class 6 - Part 1>Chapter 2 - The Essence of Change>Exercise 4>Q 2

MEDIUM

6th Kerala Board

IMPORTANT

Earn 100

What do you know about fossil fuels? Complete the flow chart.

Important Questions on The Essence of Change

MEDIUM

6th Kerala Board

IMPORTANT

Science for Class 6 - Part 1>Chapter 2 - The Essence of Change>Exercise 4>Q 3

How often do we use energy changes in daily life? Tabulate a few domestic uses of energy.

Situation	Energy conversions taking place
Bulb glowing
Working an electric motor to pump water
Lighting a match stick
Working a mixer grinder
Listening to the news on the radio

EASY

6th Kerala Board

IMPORTANT

Science for Class 6 - Part 1>Chapter 2 - The Essence of Change>Exercise 4>Q 4

What are the forms of energy we use more often in daily life?

MEDIUM

6th Kerala Board

IMPORTANT

Science for Class 6 - Part 1>Chapter 2 - The Essence of Change>Exercise 4>Q 5

Identify the forms of energy used and not used, the forms of energy produced, and energy changes that occur in each case and record them in the flow chart shown below:

Question Image