This document defines energy and its unit of measurement, joule. It discusses the law of conservation of energy and the different ways energy is used, such as for cooking, technology, heating, light, and transportation. The document then classifies sources of energy in several ways: by origin (natural vs artificial), by use (renewable vs non-renewable), by commercial value (commercial vs non-commercial), and by development (conventional vs non-conventional). Examples are provided for each classification. Population increase and irresponsible energy consumption are cited as reasons more energy will be needed in the future.

1. EEE
UNIT : 1
ENERGY AND ITS SOURCES

2.  DEFINITION OF ENERGY
 LAW OF CONSERVATION
 USES OF ENERGY
 SOURCES OF ENERGY
 ENERGY SYTEM
CONTENT

3. ENERGY
 Energy is ability to do work. Energy is physical scalar
quantity.
 The SI unit of energy is Joule.
 Joule is a derived unit and it is equal to the energy
expended in applying a force of one newton through
a distance of one meter.

5. USES OF ENERGY
1. COOKING
2. TECHNOLOGY
3. HEATING
4. LIGHT
5. TRANSPORTATION

6. • Energy can not be created nor destroyed,
only changed.
o Law of Conservation of Energy
o First Law of Thermodynamics
• Energy will always transfer from high to
low.
• No energy transfer is 100% efficient.
Energy Transfers

7. why more energy is needed in
the future are:
1.Because of the blast of population increase,
so the demand increasing.
2. Proper consumption of energy is not
practiced these days by human beings and if
we consume energy in such an irresponsible
way. We soon face energy crisis.

8. CLASSIFICATION OF ENERGY
SOURCES
1. ON THE BASIS OF ORIGIN
2.ON THE BASIS OF USES
3.ON THE BASIS COMMERCIAL VALUE
4.ON THE BASIS ON DEVELOPEMENT

9. On the Basis of Availability in Nature:
(a)Natural energy sources/ primary Energy Sources
The sources which are easily available in nature or directly
obtained from nature are called as natural energy
sources.E.g. Wind, water, solar, tidal , coal , petroleum oil
etc .
(b) Artificial Energy Sources / Secondary Energy Sources
The sources which are generated by artificial means and not
available in nature directly are known as artificial energy
sources. E.g. By nuclear reaction, chemical reactions,
petrol etc

10. On the Basis of Use:
(a)Renewable Energy Source/Green Energy: [RGPV/Dec 2013(7)]
The energy sources that can be used again and again are known as
renewable energy source is considered to be equal to lifetime of sun.
For e.g.
1. Solar Energy
2. Wind Energy
3. Tidal energy
4. Geothermal energy
5. Wave energy
6. Energy stored in water
(b) Non–renewable Energy Sources
The energy sources which and used cannot be used again are known as
non-renewable sources are :
(i) Coal, Coke etc.
(ii) Petroleum and its derivatives such as diesel, petrol, kerosene, gas nuclear
fuels etc.

11. On the Basis of Commercial Values
(a) Commercial Energy Sources:
The sources can be purchased or sold are known as
commercial energy sources. E.g. Coal, Oil, fuels etc.
(b) Non Commercial Energy Sources:
The sources which cannot be purchased or sold are
called as non-commercial sources of energy. E.g.
Solar, wind, tidal, wave, geothermal etc.

12. On the Basis of Development:
(a) Conventional energy Sources: The energy sources
which are widely used in our day to day life are known as
conventional sources or traditional energy sources. E.g.
Plant; animal and agricultural wastes are also
conventional energy sources.
(b) Non Conventional Energy Sources: The energy sources
which are not used in our day to day life are known as non
conventional sources of energy. E.g. Solar energy,
geothermal energy, wind energy, wave energy, ocean
thermal energy, biogas.

13. Thank You