questions what is needed to produce electricity from wind energy on a large scale? sa: ch: 5 sec: 3...
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QuestionsWhat is needed to produce electricity from wind
energy on a large scale?
SA: Ch: 5 Sec: 3 Part 2 “Alternative Resources”EQ: How do humans use Solar Energy?
May 19, 2015
Agenda
1.Roll
2.Chapter 5 Section 3 Part 2
“Alternative Resources”
1.Video: “Electricity and Magnetism”
Come in Quietly and sit at your desk, open to your notes, write the new question, and wait quietly for class to begin.
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Sitting in the SunWhen sunlight falls on your skin, the warmth
you feel is part of solar energy.
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Solar EnergySolar energy is energy from the sun.
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Every day, the Earth receives more than enough solar energy to meet all of our energy needs.
Solar Energy
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Solar energy is considered to be a renewable resource.
Solar Energy
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Solar energy can be changed directly into electricity.
Solar Energy
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Solar CalculatorSolar calculators receive all the energy they
need from their solar cells.
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Solar CellA single solar cell produces a small amount
of energy.
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Solar CellsThis is good for small devices yet, many are
needed to supply energy for larger devices and homes.
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Solar CellsSolar cells are quiet, reliable and have no
moving parts, can last for years with little maintenance, and produce no pollution.
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Solar PanelsSolar panels are very expensive. In the long
run they do pay for themselves.
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Have you seen solar panels?What other ways have solar panels been
used?
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Solar HeatersSolar energy can be used for direct heating
through solar collectors.
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Solar CollectorsSolar collectors are dark-colored boxes with
glass or plastic tops. The sun makes the boxes very hot. Water can run through these boxes and be heated.
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Solar CollectorsSolar collectors are very expensive, yet in
the long run they will eventually pay for themselves. They can also be used to generate electricity.
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Large Scale Solar PowerLarge scale solar power uses mirrors to
focus the sunlight and heat pipes filled with synthetic oil.
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Large Scale Solar PowerThis oil will be circulated to heat water that
will cause steam. The steam will then be used to drive an electric generator.
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Large Scale Solar Power
Another design uses mirrors to focus the sunlight on a central tower.
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Large Scale Solar PowerThe energy is then stored in salt. The salt is
then used to create steam that will drive an electric generator.
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Capture the WindWind is created indirectly by solar energy
through the uneven heating of the air.
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Wind EnergyThere is a
tremendous amount of energy in the wind, called wind energy.
You can see the effects of this energy in hurricanes and tornados.
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Wind EnergyWind energy can be used positively by
humans.
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WindmillsWindmills have been used to pump water
from the ground and generate electricity since the 1920’s.
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Wind TurbinesThe modern windmill is called a wind
turbine. Clusters of these wind turbines are often called wind farms.
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Benefits to Using Wind TurbinesWind turbines take
up only a small portion of ground surface. This allows the land to be used for more than one purpose.
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Wind energy is renewable. Wind farms can be built in 3 – 6 months. Wind turbines produce no air pollution.
Benefits to Using Wind Energy
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Disadvantages to Using Wind Energy
Wind only blows strongly and steady only in some places in order to produce electricity on a large scale.
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“Electricity and Magnetism”
1. What did you know?_______________________________________________________________________________________________________________________________________2. What did you learn?_______________________________________________________________________________________________________________________________________3. What do you want to know?_______________________________________________________________________________________________________________________________________
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Review1. What are two ways of using solar
energy?
Response: Two ways of using solar energy is …
2. What is needed to produce electricity from wind energy on a large scale?
Response: In order to produce electricity from wind energy you need …
3. What are solar collectors used for?
Response: Solar collectors are used for …