In this post, you are going to read NCERT activity 14.7 class 10 science, sources of energy. You will find a complete explanation of activity 14.7 class 10 science with a conclusion.
NCERT
Activity 14.7 Class 10 Science | Sources of Energy
Activity
14.7 Class 10 Science
· Discuss
in class the question of what is the ultimate source of energy for biomass.
Wind and ocean thermal energy.
· Is
geothermal energy and nuclear energy different in this respect? why?
· Where
would you place hydroelectricity and wave energy?
 |
| NCERT Activity 14.7 Class 10 Science , Sources of Energy |
Explanation
The ultimate source of energy
We get energy from different sources like electricity,
wind energy, thermal power plant, hydropower plants, etc.
thermal power plants use coal to produce electricity.
Kinetic energy is used in hydropower plants to produce electricity. Wind energy
is used in windmills to produce electricity.
But when we think about the ultimate sources of energy
behind these above sources, we find ‘the sun is the ultimate source.
Let’s discuss it.
Wind energy
Wind energy is used in windmills to produce electricity
and grind grains, and sailing boats.
Ultimate source of energy for wind energy
The wind blows due to uneven heating of the atmosphere. The
uneven distribution of sunlight causes uneven heating of the atmosphere, this
results in the movement of air and energy of moving air(wind), so the
ultimate source of energy is ‘The sun’.
Biomass
Biomass is organic material obtained from plants and
animals. It includes garbage, crop residue, wood, sewage, dead parts of living
beings, etc. biomass is a good source of energy.
Biomass is used in a biogas plants to produce methane and
biomass can be converted into ethanol, and biodiesel.
Ultimate source of energy for biomass
Plants absorb the sun’s energy in the process called photosynthesis.
The chemical energy in plants gets passed into animals and other living beings.
The chemical energy stored in biomass is converted into heat energy. So ultimate
source of biomass is the sun.
Ocean thermal energy
Ocean thermal energy is a powerful source of renewable
energy. Sunlight heats the surface of the ocean and this heated water is used to produce
electricity.
So the sun is the ultimate source of energy for ocean
thermal energy.
Comparison of geothermal energy and nuclear
energy with respect to the sun
There are hot regions inside the earth. This heat energy
is called geothermal energy. This energy is generated due to molten rocks inside
the core and crust.
Nuclear energy is obtained from radioactive elements
artificially.
So the sun does not provide geothermal energy and nuclear
energy.
Hydroelectricity
Flowing water and storing water in huge dams is also a
useful source of energy. Kinetic energy and potential energy are used to produce
hydroelectricity.
Wave energy
Waves are produced due to strong winds and winds are
produced by uneven heating of the atmosphere and the earth. so the sun is
responsible for this.
Conclusion
After observing this activity 14.7, we can understand
that we use different types of energy sources. Most of the energy is derived from
the sun like solar energy, hydro energy, biomass energy, ocean thermal energy, and wave energy.
But the sun is not the ultimate source of geothermal energy and nuclear energy.
Related Topics -
1. Next activity - Activity 14.8 Class 10 Science
2. Previous activity- Activity 14.6 Class 10 Science
2. NCERT solutions of Chapter 14
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