3.1.1 Identify the source of the energy in the picture above - NSC Agricultural Technology - Question 3 - 2021 - Paper 1
Question 3
3.1.1 Identify the source of the energy in the picture above.
3.1.2 Name THREE important factors that could play a role in the initial exploration phase of the ener... show full transcript
Worked Solution & Example Answer:3.1.1 Identify the source of the energy in the picture above - NSC Agricultural Technology - Question 3 - 2021 - Paper 1
Step 1
Identify the source of the energy in the picture above.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The source of 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.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Is the rock formation suitable to drill through?
Do the sources contain sufficient heat?
Environmental factors, such as sustainability of the heat source.
Step 3
Describe the process of generating electricity with a wind turbine.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The wind turns aeroplane-shaped blades attached to the turbine. The turbine then turns the main shaft, which is connected to the gearbox. The gearbox increases the revolutions, and its output shaft is connected to the generator that produces electricity.
Step 4
What happens when the pitch of the blades of a wind turbine is adjusted?
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Adjusting the pitch of the blades can increase or decrease the rotating speed, optimizing the efficiency of electricity generation.
Step 5
Why is it necessary to change the pitch of the blades on a regular basis?
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Changing the pitch is necessary to protect the wind turbine from too fast rotations in strong winds and too slow in mild winds, thereby ensuring optimal performance.
Step 6
State THREE disadvantages of wind energy.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Unreliability of the wind in certain areas.
Wind turbines produce less electricity than other available resources.
Construction of wind turbines can be very costly.
Step 7
Give FOUR reasons why photovoltaic energy panel systems are suitable for use in deep rural areas where electricity is not available.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
No power lines needed.
Energy is cheap after initial installation.
It is portable and easy to install.
They produce no pollution.
Step 8
Name TWO types of plants that can be used as a source to manufacture biodiesel.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
