one million students lesson 1: solar energy- an introduction
TRANSCRIPT
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ONE MILLION STUDENTS
Lesson 1: Solar Energy- An
Introduction
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AGENDA
• Source of energy• Renewable versus non-renewable energy• Impact of non-renewable energy• The solar alternative• Review
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USES OF ENERGY
1. What sort of things do you use electricity for everyday?• cell phone, computer, video games,
refrigeration, cooking…
2. What would you do if you didn’t have electricity to do those things?
3. How would it make you feel?
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TYPES OF ENERGY
OilNuclearGeothermalNatural GasWindHydroelectricCoalEthanolTidal
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…but we’re forgetting one!
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SOLAR ENERGY
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ENERGY CONSUMPTION
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Where our energy comes from:
US Energy Sources 2012
From http://www.epa.gov/cleanenergy/energy-and-you
Nuclear19%
Hydroelectric7%
Oil, Solar, Geothermal, Others2% Biomass
1%
Coal 37%
Natural Gas30%
Wind4%
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California Energy Usage
Hydroelectric14%
Electricity in California 2010
http://energyalmanac.ca.gov/overview/energy_sources.html
Renewable15%
Coal2%
NaturalGas53%
Nuclear16%
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RENEWABLE VERSUS NON-RENEWABLE
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Non-renewable resources are Scarce
• Scarce : (adj) rare; not abundant
• Needed by many people• World is slowly running out
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Renewable Resources
• Can use again• Will Not Run Out• Problem: not available
everywhere
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Energy Renewable Clean Safe Low Cost Notes
Fossil Fuels no no yes/no no Mining, oil drilling are dangerous. Fossil fuels cause fires.
Nuclear no yes no yes/no Very high cost to setup but low cost after installation.
Solar yes yes yes yes/no Solar panels are inefficient and take space
Wind yes yes yes yes/no High cost and space to setup. Not consistent
Biomass yes no yes yes Need land to produce bio fuel
Hyrdroelectric yes yes yes yes/no Low cost to maintain. Not cost effective or possible everywhere
Tidal yes yes yes yes Tidal energy only lasts 10 hours a day.
Geothermal no yes yes yes High cost to setup. Not available everywhere.
People yes yes yes yes Travel by foot or bike is slow and takes time
Sources of Energy Cheat Sheet
adapted from Potato Clocks and Solar Cars. Elizabeth Raum. Raintree. 2008, chicago.
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IMPACT OF NON-RENEWABLE ENERGY CONSUMPTION
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Impact to the Earth
• Greenhouse gases deteriorate the ozone layer protecting Earth • Earth heats up and melts our planet’s icecaps
which in turn:• Destroy habitats for animals, humans and
plants everywhere• Change our agricultural land (with lower
regions heating, populations move around, altering the uses of land) • Changes the climate
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THE SOLAR ALTERNATIVE
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WHY SOLAR
• Solar energy is renewable; the Sun will not “run out”
• Solar Energy is eco-friendly; it does not harm the Earth
• The Sun is easily available and accessible. It rises everyday
• The Sun is clean and healthy; it does not harm life on Earth or our atmosphere with toxic fumes.
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Classroom Demonstration:
Using Solar to light up an LED
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Review Questions:1. How many people lack access to electricity around the world?
1.3 billion people
2. What are some of the benefits of Solar lighting?
a. Higher Productivityb. Increase Incomec. Savingsd. Decrease in respiratory diseasese. Additional study hours for students
3. Why should we use solar?
a. The sun will not “run out”. It is renewable and will last a long time.b. The sun is eco-friendly and does not harm the Earthc. There are no carbon emissions that are leading to global warmingd. The sun is easily accessible and availablee. The sun is clean and healthy. It does not harm human beings with toxic fumes
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