Maharashtra Board Class 6 Geography Chapter 9 Energy Resources PDF Download

Energy Resources

Observe the pictures and answer the questions.

Which energy resource is used in figure 9.1 to obtain light?

Where did this resource come from?

Figure 9.2 shows fuel being filled in a motorcar. From where was this energy resource brought to the pump?

Figure 9.3 shows Malati with her pinwheel and her father winnowing grain. Who is helping both of them?

Which energy resource is used for lighting a lamp, running a rickshaw and heating oil as shown in figure 9.4?

What are the various purposes for which man can use sunlight?

For which of the above energy resources do we have to spend money?

Teacher's Note

Energy resources help us do many things every day. In India, people use wood, coal, and natural gas to cook food and stay warm.

Exam Trick

Remember: Some energy resources cost money (like petrol and coal), but some are free (like wind and sunlight). Think about what your family pays money for at home.

Points to Remember

Energy is power that we need for work and cooking.

Some energy comes from things we dig out of the ground like coal.

Some energy comes free from nature like wind and sun.

We use different energy resources for different jobs.

We engage in various activities to fulfil our needs, for which we need energy. In the past, human labour and animals were used for many tasks. Gradually, man's needs increased and with it, several changes took place in the use of energy resources and devices. Still, man mainly obtains this energy from nature. You must have realized this while answering the above questions. We use petrol, wind, natural gas, sunlight, etc. besides other resources.

Energy resources can be classified in many ways such as conventional–non-conventional, biotic–abiotic, renewable – non-renewable, substance-based –process-based, etc. Let us consider the last classification. The following table shows the characteristics of the energy resources through their classification.

Teacher's Note

Some things we use up quickly like coal and oil, but sun and wind never finish. In India, we have lots of coal mines but we also want to use more solar power.

Exam Trick

Remember: Substance-based means things that end (like coal), and process-based means things that go on forever (like wind and sun). Think of coal as food you eat and finish, and sun as food that grows again every day.

Points to Remember

Substance-based resources get used up and finish forever.

Process-based resources from nature never finish.

Burning coal and oil makes pollution.

Sun, wind, and water do not make pollution.

We need new technology to use sun and wind power.

Which of these energy resources are available free of cost?

Using these energy resources, we can undertake the following kinds of power generation – hydel power, thermal power, atomic power, geo-thermal power, etc. In thermal power stations, it is necessary to burn the energy resources directly to generate electricity. Kinetic energy can also be used to generate power or electricity. Figure 9.6 to 9.10 show that various energy resources are used for cooking food. List them. Now classify them using the chart we have studied. Discuss whether we can use alternate energy resources for cooking.

Teacher's Note

We cook food using wood, coal, gas, and electricity. In villages in India, many families still cook with wood on open fires.

Exam Trick

Remember: Different fuels for cooking = wood, coal, gas, electricity, kerosene. Your grandmother probably used wood, your mother uses gas, maybe soon you will use solar cookers.

Points to Remember

Wood was used for cooking long ago in villages.

Coal can be used to heat and cook food.

Natural gas is fast and clean for cooking.

Electricity helps us cook with electric stoves.

Solar cookers use free energy from the sun.

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