2. Agenda
• Introduction of Energy
• Types of Energy
• Energy Conservation Rule
• Sources of Energy
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3. Definition
• Energy is the capacity of a physical system to
perform work.
• The SI unit of energy is the joule (J) or
Newton-meter (Nm).
• The joule is also the SI unit of work.
• A scalar quantity
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4. Forms of Energy
• Kinetic energy
• Potential energy
• Mechanical energy
• Chemical energy
• Nuclear energy
• Renewable energy etc.
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5. Kinetic Energy
• Kinetic energy is a form of
energy that represents
the energy of motion.
• Scalar quantity and SI unit
is the joule.
• Measured by:
KE= ½ (Mass) (Velocity)2
• Examples: Water falling
over the fall, A Yo-Yo in
motion
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6. Potential Energy
• Energy due to position or
stored energy.
• SI unit is the joule
• Measure by:
PE=weight*gravity*Height
• Example:
Drawing a Bow-> Stores
energy because of position
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7. Energy Conservation Rule
• Energy can neither be created or destroyed.
• It can be converted from one form into another.
• For example:
Kinetic energy is converted into heat energy.
Potential energy is converted to kinetic
energy.
Chemical energy to Heat energy
• It can be stored
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8. Sources of Energy
• Biggest source of energy is our
Sun
• Two types of energy sources:
Conventional,
Nonconventional source
• Conventional sources:
– Coal
– Oil
– Gas
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9. Sources of Energy (Contd.)
• Nonconventional source/
Renewable Energy
sources: Solar, Wind, Bio
fuel etc.
• These sources have not
been traditionally used
as Energy source
• However, these sources
will always be available
in nature and are
renewable.
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