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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. By altering the angle of the blades, the turbine can slow down or prevent excessive rotation in strong winds.
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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 efficiently. This approach allows for the balancing of energy supply and demand, as different energy sources can complement each other, improving overall system reliability and efficiency.
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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 composed of semi-conductive materials, predominantly silicon. When sunlight hits the solar panels, photons knock electrons loose from their atoms, producing an electric current. This process involves several stages where the solar cells absorb sunlight and convert it into electrical energy, enabling the flow of electrons through an external circuit, delivering power to the destination.
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3.1.5 Give THREE reasons why a solar panel does not function to its full potential.
Answer
- Heat Generation: When the solar cells release heat, they tend to become warmer, which can hinder efficiency.
- Number of Panels: The effectiveness of the solar array can be limited by the number of panels available, affecting the system's overall efficiency.
- Environmental Factors: Objects blocking the sun's rays will reduce the efficiency of solar energy capture.
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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 excessive cold water is pumped into a geothermal energy source, the rocks can cool excessively, leading to a reduction in the geothermal heat and potentially diminishing the effectiveness of the energy source.
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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
- The rocks must be soft enough to drill through.
- The deeper rocks must contain sufficient heat to ensure effective energy extraction.
- The heat source should be sustainable for a significant duration to support continuous energy production.
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