The picture below shows a renewable energy source that is used to generate electricity on a large scale - NSC Agricultural Technology - Question 3 - 2021 - Paper 1
Question 3
The picture below shows a renewable energy source that is used to generate electricity on a large scale.
3.1.1 Identify the source of the energy in the picture abov... show full transcript
Worked Solution & Example Answer:The picture below shows a renewable energy source that is used to generate electricity on a large scale - NSC Agricultural Technology - Question 3 - 2021 - Paper 1
Step 1
Identify the source of the energy in the picture above.
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Answer
The source of the energy shown in the illustration is geothermal energy.
Step 2
Name THREE important factors that could play a role in the initial exploration phase of the energy source.
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Answer
Is the rock formation suitable to drill through?
Do the source contain sufficient heat?
Sustainability of the heat source.
Step 3
Describe the process of generating electricity with a wind turbine.
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Answer
The wind turns aeroplane-shaped blades that are attached to the turbine.
The turbine turns the main shaft.
This turning motion is transferred by the shaft to the gearbox.
The gearbox increases the revolutions, which are then connected to the generator that produces electricity.
Step 4
What happens when the pitch of the blades of a wind turbine is adjusted?
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Answer
Adjusting the pitch of the blades alters the rotating speed, helping to optimize energy production.
Step 5
Why is it necessary to change the pitch of the blades on a regular basis?
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Answer
To protect the wind turbine from turning too fast in strong winds.
To ensure the turbine operates effectively across various wind conditions.
Step 6
State THREE disadvantages of wind energy.
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Unreliability of the wind in certain areas.
Wind turbines produce less electricity than other available resources.
High noise levels associated with turbine operation.
Step 7
Give FOUR reasons why photovoltaic energy panel systems are suitable for use in deep rural areas where electricity is not available.
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No power lines needed.
Portable and easy to install.
No noise from generators.
They are renewable sources of energy.
Step 8
Name TWO types of plants that can be used as a source to manufacture biodiesel.
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