Understanding How to Work: Energy Sources in Class 10 Social Science

What Does It Mean to Work with Energy Sources?

To work with energy sources means to understand how these sources are extracted, processed, and used to generate power and fuel for various needs. In Class 10 NCERT Social Science, this involves studying conventional energy sources like coal, petroleum, natural gas, and electricity. These sources power industries, homes, transport, and agriculture, forming the backbone of India’s economy and daily life.

Coal: India’s Primary Source to Work Energy

Coal is the most abundant fossil fuel in India and a major commercial energy source. It forms from compressed plant material over millions of years and occurs in several types:

• Peat: Low carbon, high moisture, initial stage of coal formation.
• Lignite: Soft brown coal with high moisture, found in Neyveli.
• Bituminous: Most common commercial coal used in power and industry.
• Metallurgical coal: High-grade bituminous coal used in iron smelting.
• Anthracite: Highest quality hard coal with high carbon content.

India’s coal deposits are mainly from two geological ages:

• Gondwana coalfields: Over 200 million years old, found in Damodar valley, Jharia, Raniganj, Bokaro, Godavari, Mahanadi, Son, and Wardha valleys.
• Tertiary coalfields: About 55 million years old, located in northeast states like Meghalaya and Assam.

Since coal is bulky and loses weight when used, industries are often located near coalfields to reduce transportation costs.

Petroleum and Natural Gas: Working with Liquid and Gaseous Fuels

Petroleum is the second major energy source in India, used as fuel, lubricants, and raw materials for many industries. It forms in tertiary rock formations, trapped in anticlines and fault traps. Major petroleum fields include Mumbai High, Gujarat, and Assam.

Natural gas is found alongside petroleum and is used as fuel in power plants, industries, transport, and domestic cooking. The Hazira-Vijaipur-Jagdishpur pipeline connects gas fields to industrial centers, facilitating efficient energy distribution.

Both petroleum and natural gas are non-renewable and require careful management to work sustainably.

Electricity Generation: How to Work with Hydel and Thermal Power

Electricity is generated mainly through two methods:

• Hydroelectric Power: Renewable energy generated by river valley projects using flowing water. Examples include Bhakra Nangal, Tehri, and Sardar Sarovar dams.
• Thermal Power: Non-renewable energy generated by burning fossil fuels like coal, petroleum, and natural gas.

The choice between hydel and thermal power depends on resource availability and demand. Hydroelectricity is cleaner but depends on water availability, while thermal power plants provide consistent electricity but cause pollution.

Comparison Table: Hydel vs Thermal Power

Understanding how to work with these electricity sources helps in planning India’s energy future.

Locating and Using Energy Resources in India

India’s energy resources are unevenly distributed. Knowing where to work with these resources helps in regional development:

• Coalfields: Concentrated in Damodar valley (Jharkhand-West Bengal), Jharia, Raniganj, and northeast states.
• Petroleum fields: Mainly in Mumbai High, Gujarat, and Assam.
• Natural gas: Found alongside petroleum fields, with pipelines connecting to industrial hubs.
• Hydroelectric projects: Located on major rivers like the Ganga, Yamuna, and Narmada.

Students can actively learn by mapping these resources in their state and understanding local energy production plants. This practical approach enhances their grasp of the chapter and its real-world relevance.

Worked Example: Calculating Energy from Coal

Suppose a thermal power plant uses 500 tonnes of bituminous coal daily. The energy content of bituminous coal is approximately 24 MJ/kg.

Step 1: Convert tonnes to kilograms:

$$ 500 \text{ tonnes} = 500 \times 1000 = 500,000 \text{ kg} $$

Step 2: Calculate total energy produced:

$$ Energy = 500,000 \text{ kg} \times 24 \text{ MJ/kg} = 12,000,000 \text{ MJ} $$

This shows how much energy the plant can generate daily from coal, helping students understand the scale of energy production and how to work with such data.