Energy Sources and
Transfer of Energy
Learning outcomes
• list the different forms of energy with examples in which each
form occurs.
• state the principle of the conservation of energy and apply this
principle to the conversion of energy from one form to another.
• state that kinetic energy is given by Ek = ½mv 2 and that
gravitational potential energy is given by EP = mgh, and use these
equations in calculations.
Energy: Ability to do work
• Energy exists in many forms.
• Energy can be moved from one object to
another.
• Energy can be changed from one form to
another.
• Energy cannot be created or destroyed.
What is Always Present
But Never Visible?
ENERGY
Although energy isn’t visible,
you can detect evidence of energy.
Forms of Energy
Chemical
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Chemical energy
Hydroelectric energy
Solar energy
Nuclear Energy
Internal Energy
Geothermal Energy
Wind Energy
Potential Energy
Kinetic Energy
Nuclear
Electrical
Light/Radiant
Chemical Energy
• The energy obtained from the
chemicals ( acid and bases), any
burning material like wood.
• The food you eat contains
chemical energy that is released
when you digest your meal
• It is produced due to regrouping
of atoms e.g. :
• Wood, coal, gasoline, and
natural gas are fuels that
contain chemical energy
Hydroelectric energy
• It is also called as Hydel power Energy.
• Hydroelectricity is the term referring to electricity generated by
hydropower; the production of electrical power through the use
of the gravitational force of falling or flowing water.
• It is also types of inexhaustible energy.
• Is is generated by utilizing kinetic energy of flowing water.
• Hydel energy is produced
by utilizing kinetic energy
of flowing water. When the
water stored in the
reservoirs, behind the
dam, is allowed to flow
down from a height,
potential energy is
converted to kinetic
energy and this force
drives the blade of turbine
connected to a generator
thus produce electricity
Solar Energy
• The energy we get from sun is called asSolar energy.
• Fission and Fusion process on the surface of the sun the basic
sources of the solar energy.
Fission: break down of heavy nucleus into lighter nuclei e.g.
atomic bomb
Fusion: two lighter nuclei combine to form heavy nucleus ( more
energy is released) e.g. hydrogen bomb
Nuclear Energy
• Energy obtained from the decomposition of
nucleus.
• It is produced by the regrouping of nuclei or
decomposition of nuclei.
• Nuclear energy is released when nuclei are
split apart into several pieces, or when they
are combined to form a single, larger nucleus
Nuclear Energy
In this reaction mass change into energy and we use formula to
obtain the amount of energy.
• E=mc2
m= change in mass (kg)
c= speed of light ( 3 x 108 m/s)
Geothermal Energy
• Energy obtained from the
Earth
Wind Energy
• It normally generates due to the
pressure difference between two
points or due to density difference between
two points.
Potential Energy
• Gravitational Potential Energy
• Elastic Potential Energy
• Chemical Potential Energy
Gravitational Potential Energy
• Energy possessed by a body due to its elevated position e.g.
waterfall
• G.P.E : mgh
Elastic Potential Energy
• Stored energy in the elastic materials like spring or rubber
Chemical Potential Energy
• Energy stored in acids, bases or any material that can burned.
Kinetic Energy
• Energy possessed by a body due to motion.
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K.E= mv2
2
• E.g. : moving car, flying aero plane
Energy Conversion
All forms of energy can be converted
into other forms of energy