Transcript 8. Renewable Energy

21 July, 2015
Geothermal Power
Objectives
Be able to describe how electricity can be produced by
Geothermal power and evaluate the advantages and
disadvantages.
HSW: AF2: Make balanced judgments about scientific developments by
evaluating the economic, moral, social or cultural implications.
Used before in: Fossil Fuels Lesson
Will use again in: Next lesson – how do power
stations effect us?
PLTS: Independent enquirers: support conclusions, using reasoned arguments and evidence.
Used before in: Nuclear Power Lesson
Will use again in: Next lesson – how
do power stations effect us?
Keywords
Geo, thermal, crust, steam vent, geyser,
magma, molten, radioactive, turbine,
generator.
HW – in planner please
Question Sheet has been
emailed to you. Please
complete for next Friday 18th
Outcomes
All students should be able to:
 Use keywords to draw a labeled diagram that
helps describe how electricity can be
produced from geothermal energy in the
crust.
Most students should be able to:
 Describe the advantages and disadvantages of
geothermal energy.
Some students should be able to:
 Use their understanding to evaluate the pros
and cons of building a geothermal power plant
in a specific place.
Starter – What causes Geysers?
• Watch the clip:
• http://www.youtube.com/watch?v=Wdaow-LojM&feature=related
• Think – Pair - Share
• Describe what is happening.
• Explain why you think this is happening –
come up with a theory.
Watch: Geothermal Power clip here
Pros and cons of geothermal energy
Extension: For each one explain why it is a good or bad thing.
Should Africa Use Geothermal Energy?
•
•
•
•
•
•
•
•
•
TASK: Make an information leaflet to explain Geothermal Power stations to
worried local people
Copy the diagram of a Geothermal power station from figure 5 on page 271 onto the
blank piece of paper and explain how it produces electricity (it will be part of your
leaflet).
Use the Keywords below to explain what Geothermal energy is and how Electricity can
be produced from it:
In your explanation you should explain the meaning of the term Geothermal.
Where the energy comes from.
You have 15
How we tap into this energy.
And how we transform it into electricity.
Minutes!
Answer all of the questions in the speech bubbles
Extension: describe the energy transfers/ transformations involved in the process.
Electricity
Rocks
Turbine
Steam
Magma
Generator
Earth
Heat
Radioactive
Self assessment – grade and comment
Have you completed:
 A labeled diagram of a geothermal power
station?
 A description of how electricity can be
produced from geothermal energy?
Can you:
 Give examples of advantages and
disadvantages of geothermal energy?
Did you:
 Answer all the questions from the speech
bubbles and explained energy
transformations?
Should Africa Use Geothermal Energy?
•
•
•
•
•
•
•
•
•
TASK: Make an information leaflet to explain Geothermal Power stations to
worried local people
Copy the diagram of a Geothermal power station from figure 5 on page 271 onto the
blank piece of paper and explain how it produces electricity (it will be part of your
leaflet).
Use the Keywords below to explain what Geothermal energy is and how Electricity can
be produced from it:
In your explanation you should explain the meaning of the term Geothermal.
Where the energy comes from.
You have 15
How we tap into this energy.
And how we transform it into electricity.
Minutes!
Answer all of the questions in the speech bubbles
Extension: describe the energy transfers/ transformations involved in the process.
Electricity
Rocks
Turbine
Steam
Magma
Generator
Earth
Heat
Radioactive
Geothermal
• 1) This is the kind of thing I expect:
• Geo means ……………………. Thermal means ……………. This
thermal energy comes from the decay of …………..
elements, such as uranium, in ................ under the
ground. The heat released warms the surrounding
……… and can turn nearby water into …………. Steam
turns a ………… which drives a …………… that produces
………….
Electricity
Turbine
Magma
Earth
Heat
Rocks
Steam
Generator Radioactive
Hot Rocks – Heat energy
Water to Steam – Heat energy
Steam to turbine – Kinetic energy
Turbine to Generator – Kinetic energy
Generator – Electrical energy
Possible Answers
Will it be dangerous?
• It shouldn’t be – no more dangerous than the active volcano nearby.
That could erupt at any time. But you obviously have to keep the steam
you bring up under control.
How will it benefit my family?
• The drilling, and making the power station, are expensive. But then the
steam that powers the generators is free. So the electricity will be
cheap. It may also provide jobs.
Will it pollute the atmosphere?
• No: the main gas produced is steam.
Will the supply be reliable?
• Very reliable – the hot rock is always there. The water is recycled, so
we won’t have power cuts every time there’s a drought.
Will it affect wildlife?
• It’s unlikely to affect wildlife because the power station is quite small.
The animals won’t take any notice of it.
Will it put off tourists who come here on Safari?
• Possibly – but the power station will only take up a small area, so we
don’t need to worry about them spoiling the view.
Self assessment – grade and comment
Example of what you will write:
Grade: A
What Went Well
• I drew a neat diagram of a geothermal power
station and labelled it correctly.
• I described how electricity is made.
• I know examples of the advantages and
disadvantages
• I answered most of the questions correctly.
Even Better If
• I could have got an A* by thinking how the power
station will effect wildlife and tourism in the area.
Self assessment – grade and comment
Have you completed:
 A labeled diagram of a geothermal power
station?
 A description of how electricity can be
produced from geothermal energy?
Can you:
 Give examples of advantages and
disadvantages of geothermal energy?
Did you:
 Answer all the questions from the speech
bubbles and explained energy
transformations?
Write a Comment: WWW and EBI
Heat
Iron
Geothermal
Reliable
Water
Crust
Generator
Molten
Rocks
Electricity
5000
degrees
Earth
Fuel
Carbon
Dioxide
Radioactive
Set up cost
Steam