Transcript 1 Energy Sources

Energy
Its Nature, Forms, Sources, &
Transformations
Global Warming
Greenhouse gases
Carbon Footprint
Topics
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What Energy is
Sources of energy
Renewable – Nonrenewable
 Traditional – Alternative
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Different Forms of energy
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Temperature Scales
Transformations between forms
Analysis and Perspectives
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Global Warming: Greenhouse
gases and Carbon Footprint
Key Terms
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Kinetic Energy
Potential Energy
Mass
Endothermic
Exothermic
Renewable
Nonrenewable
Kilowatt
Kilowatt - Hour
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Temperature
Heat
Thermal Energy
Mechanical Energy
Gravitational Energy
Nuclear Energy
Radiant Energy
Chemical Energy
Electrical Energy
What is Energy?
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Energy helps us do many things.
Energy is defined as the ability to
do work.
Energy makes things move.
It makes heat & light.
It makes technology work.
It makes things grow.
Sources of Energy
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Traditional vs Alternative
Renewable vs Nonrenewable
Sources of Energy
Forms of Energy
All forms of energy fall under two categories
Potential
Potential energy is stored energy and
energy of position
Kinetic
Kinetic energy is motion. It is the motion of
waves, electrons, atoms, molecules, &
substances
Chemical Energy
Radiant Energy
Chemical energy is the energy stored in the bonds of atoms
and molecules. Biomass, petroleum, natural gas, propane,
and coal are examples.
This is electromagnetic energy that travels in transverse
waves. Radiant energy includes visible light, x-rays, gamma
rays, and radio waves. Solar energy is an example.
Nuclear Energy
Thermal Energy
Nuclear energy is the energy stored in the nucleus of an
atom. It is the energy that holds the nucleus together.
Stored Mechanical Energy
This is energy stored in objects or substances by the
application of force. Compressed metal springs and
stretched rubber bands are examples.
Gravitational Energy
This is the energy of place or position. Water held in a
reservoir behind a dam is an example. When water is
released to spin the turbines it becomes motion energy.
Thermal energy is the total amount of kinetic energy of all
the atoms in an object. Heat is the transfer of this energy.
Motion
The movement of objects or substances from one place to
another is motion. Wind is an example.
Sound
Sound is the movement of energy through objects or
substances in longitudinal waves.
Electrical Energy
This is the movement of electrons. Lightning and electricity
are examples.
Transformations of
Energy
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The Engine in your car:
Transforms chemical energy into kinetic energy.
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An electric motor in an elevator:
Transforms electric energy into gravitational
potential energy.
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Rube Goldberg Machine
Temperature Scales
A thermometer measures temperature. Temperature is the average amount
of thermal energy of each particle in an object.
Fahrenheit - °F
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Water
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Celsius - °C
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Freezing = 32 °F
Boiling = 212 °F
0 °F is temp. of snow
and salt mixture
Used only in the US
F = (9/5 x C) + 32
Water
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Freezing = 0 °C
Boiling = 100 °C
Used throughout the
world but only in
laboratories within the US
C = 5/9 x (F – 32)
Transformations of
Energy
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Details about this topic
Supporting information and
examples
How it relates to your audience
Rube Goldberg Machine
Wind blows kite which pulls cord releasing shirt which drops boot closing switch
which turns on iron which burns squirrel causing it to jump into basket releasing
woodpecker to peck and thereby sharpen the pencil.
Cog Movie
Analysis & Perspectives
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Global Climate Change
Greenhouse Gases
Carbon Footprint
Energy Consumption
Energy Flow
Energy Sources and Sectors
Petroleum Flow
Global Warming
Greenhouse Gas Emissions
Per capita greenhouse gas emission
Carbon Footprints
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A “footprint” is what is left behind as a result of activities
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The carbon footprint is a measure of the global amount of carbon dioxide
(CO2) and other greenhouse gases emitted by a human activity or
accumulated over the full life cycle of a product or service
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A Carbon Footprint is generally expressed as a CO2 equivalent (usually in
kilograms or tonnes)
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Two forms
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Life Cycle concept: What is the total emission of CO2 or other greenhouse
gases for the entire life of some product or activity. This includes during
manufacturing, transporting, using, and disposing.
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Personal concept: What is the total emission of CO2 due to the actions of an
individual over a period of 1 year.