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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
The rotor of a wind turbine can be protected from rotating too fast by changing the pitch of the blades. This adjustment causes the blades to catch less wind, effectively slowing down the rotor.
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3.1.3 Explain the concept integration with regard to alternative energy sources.
Answer
Integration refers to the combination of two or more alternative energy systems to work together harmoniously. This approach enhances energy efficiency and maximizes output by utilizing 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
Solar panels are typically composed of semi-conductive materials, such as silicon. When sunlight hits the solar cells, photons excite electrons, allowing them to become free and carry electric charge through a circuit. This process generates electricity as the electrons flow through the conductive material towards the electrical grid or a storage system.
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3.1.5 Give THREE reasons why a solar panel does not function to its full potential.
Answer
A solar panel may not function to its full potential due to:
- Heat generated during operation can decrease efficiency.
- The number and positioning of solar panels can affect energy capture.
- The high costs of renewable technology compared to less efficient alternatives can limit widespread 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 rocks will cool excessively. This can result in the geothermal heat source cooling down too much, reducing the efficiency of energy extraction.
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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
Factors to consider include:
- The geology of the area must be suitable for drilling.
- The presence of deep underground rocks that contain heat.
- The sustainability of the heat source, ensuring it can provide energy for an extended period.
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