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The increased use of alternative energy systems has reduced the demand for the supply of electricity in South Africa - NSC Agricultural Technology - Question 3 - 2016 - Paper 1
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The increased use of alternative energy systems has reduced the demand for the supply of electricity in South Africa. 3.1.1 Name TWO types of energy that apply to w... show full transcript
Worked Solution & Example Answer:The increased use of alternative energy systems has reduced the demand for the supply of electricity in South Africa - NSC Agricultural Technology - Question 3 - 2016 - Paper 1
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3.1.2 How can the rotor of a wind turbine be protected from rotating too fast during a strong wind storm?
Answer
To protect the rotor of a wind turbine from rotating too fast during a strong wind storm, the pitch of the blades can be adjusted. By changing the pitch of the blades, the wind is slowed down, reducing the rotational speed.
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3.1.3 Explain the concept integration with regard to alternative energy sources.
Answer
Integration in the context of alternative energy sources refers to the combination of two or more different energy systems to optimize energy production and usage. This approach allows for more efficient energy utilization by leveraging the strengths of each system.
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3.1.4 Describe the process that takes place in the solar panel when producing electricity from solar energy.
Answer
In a solar panel, the process of producing electricity begins when sunlight strikes the solar cells, which are made of semi-conductive materials such as silicon. The photons from the sunlight excite electrons in the solar cells, allowing them to move freely. This movement generates an electric charge which can be harnessed and routed through a circuit to provide electricity.
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3.1.5 Give THREE reasons why a solar panel does not function to its full potential.
Answer
Three reasons why a solar panel may not function to its full potential are:
- Excess heat generated in the solar panel can interfere with its efficiency.
- The number of solar panels and their arrangement affect the effectiveness of the system.
- Financial costs associated with high-efficiency solar technologies may deter optimal use.
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3.2.1 Explain what will happen to a geothermal energy source when you pump too much cold water into the source.
Answer
When too much cold water is pumped into a geothermal energy source, the geothermal heat source can cool down too much. This excessive cooling can diminish the geothermal energy's capacity to produce steam, adversely affecting its efficiency.
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3.2.2 State THREE factors that must be considered when choosing a suitable location for the extraction of geothermal energy.
Answer
Three factors to consider for geothermal energy extraction are:
- The geology of the site, ensuring the deep rocks can be drilled effectively.
- The presence and sustainability of hot rocks capable of providing continuous heat.
- Environmental readiness for the establishment of a power plant.
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