What is Non-Renewable Energy?

S4-SA4-0065

Grade Level:

Class 7

Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics

Definition

What is it?

Non-renewable energy sources are natural resources that form over millions of years and cannot be replaced quickly once used up. They exist in limited quantities on Earth, meaning they will eventually run out if we keep using them.

Simple Example

Quick Example

Imagine you have a small box of your favourite ladoos. Once you eat all the ladoos, they are gone, and you can't get more until someone makes a new batch, which takes time. Non-renewable energy is like that box of ladoos – once we use up the existing stock, it's finished for a very, very long time.

Worked Example

Step-by-Step

Let's say a small village uses 100 kg of coal every day for electricity. There is a coal mine nearby with 36,500 kg of coal.

Step 1: Calculate the total coal available: 36,500 kg.
---Step 2: Calculate daily coal consumption: 100 kg/day.
---Step 3: Find out for how many days the coal will last: Total coal / Daily consumption.
---Step 4: 36,500 kg / 100 kg/day = 365 days.
---Step 5: This means the coal will last for exactly one year. After that, the village will have no more coal from that mine, as coal takes millions of years to form again.
---Answer: The coal will last for 365 days, showing it's a limited, non-renewable resource.

Why It Matters

Understanding non-renewable energy is crucial for solving global challenges like climate change and ensuring energy security for India. Engineers in EVs and Space Technology are constantly looking for alternatives, while scientists in Chemistry and Physics work on making these sources cleaner. It's a key topic for careers in energy management and environmental science.

Common Mistakes

MISTAKE: Thinking non-renewable energy sources can be reused or replenished quickly. | CORRECTION: Non-renewable sources are used up permanently once consumed and take millions of years to form again.

MISTAKE: Believing all energy sources are non-renewable. | CORRECTION: There are also renewable energy sources like solar and wind, which are naturally replenished.

MISTAKE: Confusing non-renewable energy with 'bad' energy. | CORRECTION: While they cause pollution, non-renewable sources have powered much of our development. The goal is to find cleaner ways to use them and transition to renewables.

Practice Questions

Try It Yourself

QUESTION: Name two common examples of non-renewable energy sources. | ANSWER: Coal and Petroleum.

QUESTION: Why is natural gas considered a non-renewable resource? | ANSWER: Because it takes millions of years to form deep within the Earth and exists in limited quantities.

QUESTION: If a city uses 500 barrels of crude oil per day and has a reserve of 182,500 barrels, for how many days will the reserve last? | ANSWER: 182,500 barrels / 500 barrels/day = 365 days.

MCQ

Quick Quiz

Which of the following is NOT a non-renewable energy source?

Coal

Petroleum

Solar Energy

Natural Gas

The Correct Answer Is:

Solar energy comes from the sun and is constantly available, making it a renewable resource. Coal, petroleum, and natural gas are fossil fuels that take millions of years to form and are finite.

Real World Connection

In the Real World

Most of the electricity powering our homes, schools, and even the trains across India still comes from burning coal in thermal power plants. The petrol and diesel used in auto-rickshaws, cars, and buses that we see daily are also non-renewable petroleum products. Understanding this helps us appreciate why saving electricity and choosing public transport is important.

Key Vocabulary

Key Terms

FOSSIL FUELS: Fuels formed from the remains of ancient plants and animals over millions of years, like coal, oil, and natural gas. | LIMITED QUANTITY: Meaning there is only a certain amount available and it will eventually run out. | EXHAUSTIBLE: Can be used up completely. | GEOLOGICAL PROCESSES: Natural processes occurring on Earth over very long periods, like the formation of rocks and fossil fuels.

What's Next

What to Learn Next

Now that you understand non-renewable energy, your next step is to explore 'What is Renewable Energy?'. Learning about renewable sources will show you the alternatives we have for a sustainable future and how they are different from what you just learned.