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3.1 List the FOUR main parts of a wind turbine - NSC Agricultural Technology - Question 3 - 2020 - Paper 1
Question 3
3.1 List the FOUR main parts of a wind turbine. 3.2 State THREE factors that determine the efficiency of an electrical solar panel. 3.3 Geothermal energy is the he... show full transcript
Worked Solution & Example Answer:3.1 List the FOUR main parts of a wind turbine - NSC Agricultural Technology - Question 3 - 2020 - Paper 1
Step 1
List the FOUR main parts of a wind turbine.
Answer
The main parts of a wind turbine include:
- Rotor - The blades that capture wind energy.
- Gearbox - Converts the rotational energy to a higher speed suitable for power generation.
- Generator - Converts mechanical energy into electrical energy.
- Controller - Manages the operation of the turbine and ensures it runs efficiently.
Step 2
State THREE factors that determine the efficiency of an electrical solar panel.
Answer
The efficiency of an electrical solar panel can be influenced by the following factors:
- Positioning - The angle and direction of the solar panel should optimize exposure to sunlight.
- Obstructions - Any objects blocking sunlight can reduce the panel's electricity output significantly.
- Cleanliness - The cleanliness of the panel's surface affects its ability to absorb sunlight and generate energy efficiently.
Step 3
Briefly describe the procedure that must be followed to harness geothermal energy and transform it into electricity.
Answer
To harness geothermal energy, the following procedure should be followed:
- Drilling - Deep holes are drilled into the Earth to reach significant geothermal hot spots.
- Pipe Installation - A pipe is placed deep into the hole to bring steam to the surface.
- Energy Generation - The steam is channeled through a turbine connected to a generator, producing electricity.
- Cooling and Recycling - After passing through the turbine, the cooled water is pumped back down and the process is repeated.
Step 4
State TWO main problems associated with geothermal energy.
Answer
Two main problems associated with geothermal energy include:
- Escaping Gases - Power plants must manage the escaping gases that may be harmful.
- Resource Location - It can be expensive and challenging to locate effective heat sources.
Step 5
State FOUR disadvantages of bio-fuel.
Answer
The disadvantages of bio-fuel include:
- Low energy output - Bio-fuels often provide less energy compared to fossil fuels.
- High production costs - The costs associated with producing bio-fuels can be significantly high.
- Land use competition - Growing crops for bio-fuels can lead to food shortages and lower food production.
- Environmental Impact - It can cause habitat destruction and reduce biodiversity.
Step 6
State FOUR advantages of the solar geyser over an ordinary electrical geyser.
Answer
Advantages of a solar geyser include:
- Energy Efficiency - Solar geysers utilize renewable energy, reducing dependency on electric supply.
- Cost Savings - They significantly reduce electricity bills due to lower energy consumption.
- Environmental Impact - Solar geysers produce clean energy, leading to less environmental degradation.
- Maintenance Cost - Generally, solar geysers have lower maintenance costs compared to conventional geysers.