Sources of Energy: Class 10 Science NCERT Chapter 14

Key Features of NCERT Material for Class 10 Science Chapter 14 – Sources of Energy

In the previous chapter 13, you learned about Magnetic Effect of Electric Current. In this chapter you will learn about Sources of Energy.

Quick revision notes

  •     Acids: Indicators, General attributes, Properties of acids, Chemical nature of acids.

Sources of Energy: The thing which is capable of providing enough useful energy at a steady rate over a long period of time is called a source of energy.

A Good wellspring of energy ought to be:

  •       Safe and advantageous to use, For instance; energy atomic can be utilized distinctly by exceptionally prepared specialists with the assistance of atomic force plants. It can’t be utilized for our family reason.
  •       Easy to ship, For instance; coal, petroleum, diesel, LPG and so forth must be moved from the spots of their creation to the shoppers.
  •       Easy to store, For instance; colossal capacity tanks are needed to store petroleum, diesel, LPG and so forth.

Qualities of a decent fuel

  •       High calorific worth.
  •       Less smoke.
  •       Less buildup subsequent to consuming.
  •       Easy accessibility.
  •       Inexpensive.
  •       Easy to store and transport.

Characterization of Sources of energy

The wellsprings of energy can be delegated follows :

  1. Renewable sources of energy.
  2. Non-Renewable sources of energy.
  3. 1. Renewable sources of energy: Renewable sources of energy are those which are unlimited, i.e., which can be supplanted as we use them and can be utilized to deliver energy over and over.

These are accessible in a boundless sum in nature and create inside a moderately brief timeframe.

Case of Renewable Sources of Energy :

  •       Solar energy.
  •       Wind energy.
  •       Water energy (hydro-energy).
  •       Geothermal energy.
  •       Ocean energy.
  •       Biomass energy (kindling, creature compost and biodegradable waste from urban communities and yield buildups comprise biomass).

Advantages of Renewable Sources of Energy

  •       These sources will keep going as long as the Earth gets light from the sun.
  •       These sources are unreservedly accessible in nature.
  •       These sources don’t bring about any contamination.
  1. Non-Renewable Source of Energy: Non-inexhaustible sources of energy are those which are expendable and can’t be supplanted once they have been utilized. These sources have been aggregated in nature over an extensive stretch of a great many years.

Instances of Non-renewable Sources of Energy 

  • Coal.
  •  Oil.
  • Natural gas.

Every one of these energizes are called petroleum derivatives.

Disadvantages of Non-renewable Sources of Energy

  •       Due to their broad use, these sources are quick draining.
  •       It is hard to find and endeavor new stores of these sources.
  •       These sources are a significant reason for natural contamination.

Fossil Fuels: Fossil fuels are the remaining parts of ancient plants and creatures which got covered somewhere inside the mid a large number of years prior because of some common cycles

These fossil fuels are non-renewable sources of energy and cause natural issues because of contamination.

Arrangement of Fossil Fuels: During its development, a whole life form or its parts frequently get covered in sand or mud. These, at that point rot and crumble leaving no indications of their reality. Infact, the harder pieces of life forms after their demise settle down and are secured by residue and exposed to outrageous weight and temperature or the Earth changes over them into fossil fuels, the cycle being alluded to as fossilization.

Disadvantage of Fossil Fuels

  •       The fossils are non-inexhaustible sources of energy and once utilized can’t be restored.
  •       Burning of fossil fuels causes air contamination.
  •       The fossil fuels saves in the Earth are restricted and may get depleted soon.

Thermal Power Plants: It creates power from heat delivered by ignition of coal and oil. For instance; fossil fuels.

  •       Use coal, oil and flammable gas produce warm power.
  •       Power transmission is proficient.
  •       The steam delivered by consuming fossil fuels nans the turbine to create power.

Sources of energy are likewise named

  •       Conventional sources of energy and
  •       Non-conventional sources of energy.

(i) Conventional Sources of Energy are those which are utilized widely and meet a stamped segment of our energy prerequisite and these are :

(a) Fossil fuels (coal, oil and gaseous petrol) and (b) Hydro (energy of water streaming in waterways).

Biomass energy and wind energy additionally fall in this class as these are being utilized since antiquated occasions.

(ii) Non-conventional Sources of Energy are those which are not utilized as widely as the ordinary ones and meet our energy necessity just on a restricted scale. Sun powered energy, sea energy, (flowing energy, wave energy, sea warm energy, OTE), Geothermal energy and atomic energy have a place with this class. These sources of energy which have been tapped with the guide of advances in innovation to meet our developing energy needs are additionally called elective sources of energy.

Renewable Sources of Energies

  1. Solar Energy: The energy delivered by the sun as warmth and light energy is called as sun powered energy.

Sun based radiations can be changed over power through sun based cells (Photovoltaic cells).

Photovoltaic cells convert sun based radiations straightforwardly into power through silicon sunlight based cells.

Sun based cells mastermind on a huge level sheets structure a Mirror sun powered board.

Sun based cookers are painted dark from outside and an enormous glass plate to trap sun oriented radiations by green house impact.

Advantages of Solar Cookers

  •       Eco-accommodating.
  •       Renewable.
  •       Used in country regions.
  •       Retains all the supplements in food because of moderate cooking.

Disadvantages of Solar Cookers :

  •       Silicon cells are costly.
  •       Earth’s surface doesn’t have uniform solar radiations.
  •       Cannot be utilized around evening time or on overcast days.
  •       Cannot be utilized to make chapattis for fricasseeing as these require a temperature of 140°C or more. (Greatest temperature of 100°C just can be accomplished in a sun oriented cooker) Other Solar Devices are Solar water warmer and Solar heater.
  1. Wind Energy: At the point when enormous masses of air move starting with one spot then onto the next then it is alluded to as wind. During this cycle, active energy gets related with it which is alluded to as wind energy.

It tends to be changed over into mechanical and electrical energy.

Dynamic energy of wind is utilized in running of windmills, which are utilized to lift water, granulate grains and so on.

Uses of Wind Energy

The significant uses of wind energy are:

  •       It is utilized to drive windmills, water lifting siphons, and flour factories, and so forth.
  •       It is utilized to move deal pontoons.
  •       It is utilized to fly motor less planes or gilders noticeable all around.
  •       It is utilized to produce electrically utilized for different purposes like lightning, warming, and so forth.


  •       Eco-accommodating
  •       Renewable.

Disadvantages :

  •       Wind speed doesn’t uniform consistently.
  •       Needs an enormous region to raise arrangement of windmills.
  •       Big measure of speculation is required.
  •       The yield is less when contrasted with speculation

.3. Hydro Power Plant (hydro energy): At the point when the water streaming in a waterway is put away in a skyscraper dam and permitted to tumble from the head of the dam. The water surges down with an extraordinary power, which can be used to drive enormous water Lurbine. These turbines are associated with electric generators which produce electric flow. The power produced in this cycle is named as hydroelectricity or hydel power. Indeed the cycle includes transaction of expected vitality of the water into dynamic vitality’ and afterward into electric vitality.

It is the most customary sustainable power source got from water tumbling from an incredible tallness.

It is perfect and nonpolluting wellspring of vitality.

Dams are built to gather water streaming in high height waterway. The put away water has a ton of possible vitality.

At the point when water is permitted to tumble from a tallness, potential vitality changes to active vitality which pivots the turbines to create power.

Advantages of Hydro Power Plant :

  •       It is promptly and bounteously accessible wherever liberated from cost.
  •       It is eco-accommodating and doesn’t deliver any sort of natural contamination.
  •       It is a sustainable source as water itself is a sustainable and boundless asset.
  •       It is a modest wellspring of vitality, as it doesn’t include any exorbitant speculation.

Disadvantages of Hydro Power Plant

  •       Highly costly to build.
  •       Dams can’t be built on all stream locales.
  •       Large regions of human residence and horticulture fields get lowered.
  •       People face social and ecological issues.
  1. Geothermal Energy: Geothermal energy is the warmth of the Earth and is the normally happening thermal energy found inside stone arrangements and the liquids held inside those developments.

Energy outfit from the warmth of the Sun is called Geo Thermal Energy.

Magma is framed when this warmth dissolves the stones. The stones and hot gases are called magma

The magma gets gathered at certain profundities underneath the Earth’s surface. These spots are called ‘Problem areas’.

At the point when underground water comes in contact these problem areas, it changes into steam, which can be utilized to produce power.

Advantages of Geo Thermal Energy

  •       Renewable
  •       Inexpensive

Disadvantages of Geo Thermal Energy

  •       Only a couple of locales are accessible for saddling energy.
  •       Expensive
  1. Ocean Energy: The oceans get practically 71% of the outside of the Earth. The gigantic measure of water present in them didn’t go about as a major gatherer of sun based warmth energy, yet additionally store enormous measure of it because of its high explicit warmth. Accordingly, ocean water can be utilized as an inexhaustible asset of energy.

The principle types of ocean energy are portrayed as under :

(I) Ocean Thermal Energy: The energy accessible because of the temperature contrast between the more profound levels and surface of an ocean is called as Ocean Thermal Energy,

(ii) Ocean Tidal Energy: The ascent of ocean water because of the fascination of the moon is alluded to as elevated tide and its fall as low tide. The colossal development of water because of elevated and low tide give a lot of energy known as Ocean Tidal Energy. This flowing energy can be used by building a flowing torrent or dam.

(iii) Sea Wave Energy: The energy acquired from the fast ocean waves is alluded to as ocean wave energy. Infact, these rapid ocean waves have a ton of motor energy related with them, which can be utilized to drive dynamos which convert active energy into electrical energy.

(iv) Energy from Nuclear Deuterium of Oceans: The oceans water contains a boundless measure of weighty hydrogen isotope called as deuterium which is isotope hydrogen having one neutron in its core. Researchers are striving to deliver energy via conveying the controlled atomic splitting of deuterium isotope. The cycle is still in its test stage.

(v) Energy From Salinity Gradient in Seas: The distinction in the convergence of salts in the water of the at least two oceans is known as a saltiness angle. This saltiness slope is presently a day used to acquire energy with the association of appropriate strategies,

(vi) Energy From Sea Vegetation or Biomass: Sea vegetation or biomass is another immediate wellspring of energy on the grounds that the tremendous measure of ocean growth present in the ocean water gives a perpetual flexibly of methane fuel.

Disadvantages: Uniform flowing activity isn’t seen.

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