Syllabus covered in the MSVgo app

Download MSVgo app now!

Chapter 12 – Sources Of Energy

The following Topics and Sub-Topics are covered in this chapter and are available on MSVgo:


Did you know that India ranks 3rd in the world to consume energy after China and the United States?

We consume energy in every step of our lives, be it our schools, homes, and workplaces. Have you wondered what are the essential sources of energy around you?

India is highly dependent on coal and petroleum to generate electricity. Our country has around 22 nuclear power reactors spread over six locations; it is likely to double by 2030. There are mainly two sources of energy: renewable sources of energy and non renewable sources of energy.

The basic definition of energy is easy to understand.

The capacity for doing any action can be defined as energy. It is conservative. A simple example of the energy can be lighting a candle where you are converting the chemical (potential) energy into the light and heat energy.  It exists in many forms like electrical energy, solar energy, hydro energy, thermal energy, etc.

You might have come across the formula for energy, i.e.

Energy = Power x Time

For example, 

If a 30-watt lamp is turned on for an hour, how many joules of electrical energy is converted by the lamp?

After applying the formula,

= 30 watts x 3600s
= 108,000 joules

Power here is in watts and time is in seconds, and the answer is in joules.

Renewable Sources of Energy

The renewable energy sources are the natural resource that can replenish quickly after their use. These energy sources are available to us in abundance and are environment-friendly and sustainable.

Some of the renewable sources are:

  • Solar Energy

Solar energy is the heat and light that comes from the sun. We use the sun’s energy with the help of the Photovoltaic cells that convert solar energy to electricity with the help of silicon present in them. One can, hence, use the electricity for a variety of purposes. Some examples that use these cells are solar cookers, large solar cells, etc.

Solar cookers have a lot of benefits like:

  • Environment – friendly
  • Renewable
  • Retains nutrient
  • Higher longevity than other utensils

The demerit of a solar cooker is one cannot use it during night time. Hence, it becomes useless when the weather is cloudy, or one needs to cook after sunset.

  • Wind Energy

What do you understand by wind energy?

Wind energy is utilizing wind to convert kinetic energy to mechanical energy and, as a result, generate electricity.

It is a renewable source of energy that is environment-friendly and clean. Wind energy’s primary use is to generate electricity, drive windmills, propel sailboats, and many more.

Since the early 20th century, we have been generating energy through wind turbines. The wind pushes a propeller through a mechanical system that rotates the generator’s rotor and produces electricity.

  • Geothermal Energy

Geothermal energy is the energy which we obtain from the Earth. You might wonder how the Earth serves as a source?

Well, this type of energy is obtained from rock formations and the fluids within those formations. Magma is one of them, and it forms when heat melts rocks.

This magma is collected deep in the Earth, and the place where it accumulates is called “hotspots.” When water flows through these hotspots, it generates steam, which can be used to produce electricity.

  • Ocean Energy

The ocean covers 71% of the earth’s surface, and we can obtain a fair amount of energy from it. The main form of ocean energy is ocean thermal energy.

The difference in the temperature between water at the surface and depths gives rise to thermal energy in the oceans. The hot water boils the ammonia to form vapors, and it moves the turbine. Coldwater condenses the steam back to liquid form.

  • Water Energy/Hydro Energy

Dams are one of the common examples of water energy or hydro energy. When a flowing river is stored in a high–rise dam and then flows down the damn, it converts the potential energy to kinetic energy. This kinetic energy is used to drive the turbines to produce electricity.

The turbines are connected to generators, and in turn, they generate electricity. In this case, hydro energy is converted to electrical energy.

Water is available to us in abundance; hence, it is a good source of electrical energy.

Non renewable sources of energy are present in a limited quantity and are exhaustible. Once they are utilized, it takes millions of years to return to their original form and get replaced or replenished. Some of them are coal, natural gas, oil, etc.

Some non – renewable sources are:

  • Thermal Power Plants

In thermal power plants, coal and petroleum are combusted to produce heat, which generates electricity.

  • Fossil Fuels

Fossil fuels are an excellent source of electricity. Fuels like coal, gas, oil are combusted to produce steam. The steam produced by these fossil fuels generates electricity for our homes.

  • Nuclear Energy

Nuclear energy is generated through nuclear fission, which produces heat and runs the turbine to generate electricity.

Nuclear power plants control the process of nuclear fission and generate electricity. Uranium (U-235) is mostly used in these power plants to generate nuclear energy. This element is very rare and a non – renewable resource.

There are primarily two types of energy sources: renewable and non-renewable. Both have their advantages and disadvantages. It is important to learn about these sources to know how things work around us and what drives them.

1. What are the main sources of energy?
The primary sources of energy are fossil fuel energy, nuclear energy like coal, natural gas, oil, etc., and renewable sources like water, wind, geothermal products like magma, sun, etc.

2. What do you mean by sources of energy?
A source from which you can obtain useful energy directly or through conversion in abundance is energy sources. Energy can be converted from one form to another easily.

3. What is energy and sources of energy?
Energy is the power that is obtained from our natural resources. It exists in many forms like electrical energy, solar energy, hydro energy, thermal energy, etc. Any source from which you can obtain useful energy directly or through conversion in abundance is a source of energy.

4. What is the cheapest energy source?
Sunlight and wind are the cheapest sources of energy.

5. Which power source is most efficient?
Sun is the most efficient power source for a variety of purposes. It is used in manufacturing industries. The wind is also a very efficient source. Both of these energy sources are renewable and environment-friendly.

If you want to learn more about sources of energy, make sure to get the MSVGo app – a vast resource of videos, educational material and interactive methods of learning that will help you understand the concepts quickly. MSVGo has a large video library that uses visualizations to enhance both learning and teaching and makes concepts easier to grasp.

High School Physics

  • Alternating Current
  • Atoms
  • Communication Systems
  • Current Electricity
  • Dual nature of Radiation and Matter
  • Electric Charges and Fields
  • Electricity
  • Electromagnetic Induction
  • Electromagnetic Waves
  • Electron Beams and Radioactivity
  • Electrons and Photons
  • Electrostatic Potential and Capacitance
  • Fluid Pressure
  • Force and Acceleration
  • Force And Laws Of Motion
  • Gravitation
  • Internal Energy
  • Kinetic Theory
  • Law of motion
  • Light – Reflection And Refraction
  • Magnetic Effects Of Electric Current
  • Magnetism and Matter
  • Management Of Natural Resources
  • Mechanical properties of Fluids
  • Mechanical properties of Solids
  • Motion
  • Motion in a plane
  • Motion in a straight line
  • Moving Charges and Magnetism
  • Nuclear Energy
  • Nuclei
  • Oscillations
  • Our Environment
  • Paths of Heat
  • Physical world
  • Ray optics and optical instruments
  • Semiconductor Devices
  • Semiconductor Electronics: Materials, Devices and Simple Circuits
  • Simple Machines
  • Sound
  • Sources Of Energy
  • Specific and Latent Heats
  • Spherical Mirrors
  • Static Electricity
  • Systems of Particles and Rotational motion
  • Thermal properties of matter
  • Thermodynamics
  • Units and Measurement
  • Vectors, Scalar Quantities and Elementary Calculus
  • Wave Optics
  • Waves
  • Work, Power and Energy

High School Chemistry

  • Acids, Bases and Salts
  • Alcohols, Phenols and Ethers
  • Aldehydes, Ketones and Carboxylic Acids
  • Aliphatic and Aromatic Hydrocarbons
  • Alkyl and Aryl Halides
  • Amines
  • Analytical Chemistry 
  • Atomic Structure
  • Atoms And Molecules
  • Basic concepts of Chemistry
  • Biomolecules
  • Carbon And Its Compounds
  • Carboxylic acids and Acid Derivatives
  • Chemical Bonding and Molecular Structures
  • Chemical Energetics
  • Chemical Equilibria
  • Chemical Kinetics
  • Chemical Reactions And Equations
  • Chemical Reactions and Their Mechanisms
  • Chemistry in Everyday Life
  • Chemistry of p-Block elements
  • Chemistry of Transition and Inner Transition
  • Classification of Elements
  • Coordination Compounds
  • Cyanide, Isocyanide, Nitro compounds and Amines
  • Electrochemistry
  • Electrolysis
  • Elements, Compounds and Mixtures
  • Environmental Chemistry
  • Equilibrium
  • Ethers and Carbonyl compounds
  • Haloalkanes and Haloarenes
  • Hydrocarbons
  • Hydrogen
  • Ideal solutions
  • Introduction to Organic Chemistry
  • Ionic equilibria
  • Matter
  • Matter Around Us
  • Matter In Our Surroundings
  • Metallurgy
  • Metals And Non-Metals
  • Mole Concept and Stoichiometry
  • Natural Resources
  • Organic Chemistry – Basic Principles
  • Periodic Classification of Elements
  • Physical and Chemical Changes
  • Physical and Chemical Properties of Water
  • Polymers
  • Preparation, Properties and Uses of Compounds
  • Principles and Processes of Isolation of Elements
  • Redox Reactions
  • Relative Molecular Mass and Mole
  • States of Matter
  • Structure Of The Atom
  • Study of Compounds
  • Study of Gas Laws
  • Study of Representative Elements
  • Surface Chemistry
  • The d-block and f-block elements
  • The Gaseous State
  • The p-Block Elements
  • The Periodic Table
  • The s-Block Elements
  • The Solid State
  • Thermodynamics

High School Biology

  • Absorption and Movement of Water in Plants
  • Adolescent Issues
  • Anatomy of Flowering Plants
  • Animal Kingdom
  • Bacteria and Fungi-Friends and Foe
  • Biodiversity and Conservation
  • Biofertilizers
  • Biological Classification
  • Biomedical Engineering
  • Biomolecules
  • Biotechnology and its Applications
  • Biotic Community
  • Body Fluids and Circulation
  • Breathing and Exchange of Gases
  • Cell – Unit of Life
  • Cell Cycle and Cell Division
  • Cell Division and Structure of Chromosomes
  • Cell Reproduction
  • Cellular Respiration
  • Chemical Coordination and Integration
  • Circulation
  • Control And Coordination
  • Crop Improvement
  • Digestion and Absorption
  • Diversity In Living Organisms
  • Ecosystem
  • Environmental Issues
  • Excretory Products and their Elimination
  • Flowering Plants
  • Genes and Chromosomes
  • Health and Diseases
  • Health and Its Significance
  • Heredity And Evolution
  • Heredity and Variation
  • How Do Organisms Reproduce?
  • Human Diseases
  • Human Eye And Colourful World
  • Human Health and Disease
  • Human Population
  • Human Reproduction
  • Hygiene
  • Improvement In Food Resources
  • Integumentary System- Skin
  • Kingdom Fungi
  • Kingdom Monera
  • Kingdom Protista
  • Life Processes
  • Locomotion and Movement
  • Microbes in Human Welfare
  • Mineral Nutrition
  • Molecular Basis of Inheritance
  • Morphology of Flowering Plants
  • Neural Control And Coordination
  • Nutrition in Human Beings
  • Organism and Population
  • Photosynthesis
  • Photosynthesis in Higher Plants
  • Plant Growth and Development
  • Plant Kingdom
  • Pollination and Fertilization
  • Pollution; Sources and its effects
  • Principles of Inheritance and Variation
  • Reproduction and Development in Angiosperms
  • Reproduction in Organisms
  • Reproductive Health
  • Respiration in Human Beings
  • Respiration in Plants
  • Respiratory System
  • Sexual Reproduction in Flowering Plants
  • Strategies for Enhancement in Food Production
  • Structural Organisation in Animals
  • Structural Organisation of the Cell
  • The Endocrine System
  • The Fundamental Unit Of Life
  • The Living World
  • The Nervous System and Sense Organs
  • Tissues
  • Transpiration
  • Transport in Plants

High School Math

  • Algebra – Arithmatic Progressions
  • Algebra – Complex Numbers and Quadratic Equations
  • Algebra – Linear Inequalities
  • Algebra – Pair of Linear Equations in Two Variables
  • Algebra – Polynomials
  • Algebra – Principle of Mathematical Induction
  • Algebra – Quadratic Equations
  • Binomial Theorem
  • Calculus – Applications of Derivatives
  • Calculus – Applications of the Integrals
  • Calculus – Continuity and Differentiability
  • Calculus – Differential Equations
  • Calculus – Integrals
  • Geometry – Area
  • Geometry – Circles
  • Geometry – Conic Sections
  • Geometry – Constructions
  • Geometry – Introduction to Euclid’s Geometry
  • Geometry – Three-dimensional Geometry
  • Geometry – Lines and Angles
  • Geometry – Quadrilaterals
  • Geometry – Straight Lines
  • Geometry – Triangles
  • Linear Programming
  • Matrices and Determinants
  • Mensuration – Areas
  • Mensuration – Surface Areas and Volumes
  • Number Systems
  • Number Systems – Real Numbers
  • Permutations and Combinations
  • Probability
  • Sequence and Series
  • Sets and Functions
  • Statistics 
  • Trignometry – Height and Distance
  • Trignometry – Identities
  • Trignometry – Introduction

Middle School Science

  • Acids, Bases And Salts
  • Air and Its Constituents
  • Basic Biology
  • Body Movements
  • Carbon and Its Compounds
  • Cell – Structure And Functions
  • Changes Around Us
  • Chemical Effects Of Electric Current
  • Chemistry in Your Life
  • Coal And Petroleum
  • Combustion And Flame
  • Components Of Food
  • Conservation Of Plants And Animals
  • Crop Production And Management
  • Electric Current And Its Effects
  • Electricity And Circuits
  • Elements and Compounds
  • Fibre To Fabric
  • Food production and management
  • Force And Pressure
  • Forests: Our Lifeline
  • Friction
  • Fun With Magnets
  • Garbage In, Garbage Out
  • Getting To Know Plants
  • Health and Hygiene
  • Heat
  • Hydrogen
  • Life Processes: Nutrition in Animals and Plants
  • Light, Shadows And Reflections
  • Materials: Metals And Non-Metals
  • Matter and Its States
  • Metals and Non-metals
  • Micro Organisms: Friend And Foe
  • Motion And Measurement Of Distances
  • Motion And Time
  • Nutrition In Animals
  • Nutrition In Plants
  • Organization in Living Things
  • Our Environment
  • Physical And Chemical Changes
  • Pollution and conservation
  • Pollution Of Air And Water
  • Reaching The Age Of Adolescence
  • Reproduction In Animals
  • Reproduction In Plants
  • Respiration In Organisms
  • Rocks and Minerals
  • Separation Of Substances
  • Simple Machines
  • Soil
  • Some Natural Phenomena
  • Sorting Materials Into Groups
  • Sound
  • Stars And The Solar System
  • Structure of Atom
  • Synthetic Fibers And Plastics
  • The Living Organisms And Their Surroundings
  • Transfer of Heat
  • Transformation of Substances
  • Transportation In Animals And Plants
  • Universe
  • Waste-water Story
  • Water: A Precious Resource
  • Weather, Climate And Adaptations Of Animals To Climate
  • Winds, Storms And Cyclones

Middle School Math

  • Addition
  • Area and Its Boundary
  • Boxes and Sketches
  • Data Handling
  • Fun With Numbers
  • Heavy and Light
  • How Many
  • Long And Short
  • Mapping
  • Measurement
  • Money
  • Multiplication and Factors
  • Multiply and Divide
  • Numbers
  • Parts and Wholes
  • Pattern Recognition
  • Patterns
  • Play With Patterns
  • Rupees And Paise
  • Shapes And Angles
  • Shapes And Designs
  • Shapes and Space
  • Similarity
  • Smart Charts
  • Squares
  • Subtraction
  • Tables And Shares
  • Tenths and Hundredths
  • Time
Please switch to portrait mode
for the best experience.
Click to open Popup