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Questions and Answers
What causes wind according to the text?
What causes wind according to the text?
- Rotation of the earth on its axis
- Movement of hot and cold air masses
- Air in motion due to pressure gradient caused by solar energy irradiating the earth (correct)
- Changes in the earth's magnetic field
What possesses energy by virtue of its motion, according to the text?
What possesses energy by virtue of its motion, according to the text?
- Water
- Magnetic fields
- Wind (correct)
- Sunlight
What can extract part of the energy from moving air, according to the text?
What can extract part of the energy from moving air, according to the text?
- Devices that create turbulence in moving air
- Devices that redirect moving air vertically
- Any device capable of slowing down the mass of moving air (correct)
- Devices that increase the speed of moving air
What is the source of wind power, as mentioned in the text?
What is the source of wind power, as mentioned in the text?
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What is the efficiency limit for wind energy conversion determined by, according to the text?
What is the efficiency limit for wind energy conversion determined by, according to the text?
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Study Notes
Causes of Wind
- Wind is caused by the uneven heating of the Earth's surface, leading to changes in air pressure.
- Variations in temperature result in different air densities, prompting air movement from high to low-pressure areas.
Energy in Motion
- Kinetic energy is the form of energy possessed by an object due to its motion.
- This energy is directly related to the mass and velocity of the moving air.
Energy Extraction from Moving Air
- Wind turbines can extract a portion of the kinetic energy from moving air.
- These devices convert the energy of wind into mechanical energy, which is then transformed into electricity.
Source of Wind Power
- The sun is the primary source of wind power, driving the atmospheric processes that create wind.
- Solar heating affects the temperature and pressure fluctuations within the atmosphere.
Efficiency Limit for Wind Energy Conversion
- The theoretical maximum efficiency limit for converting wind energy into usable energy is determined by Betz's Law.
- This law states that no turbine can capture more than 59.3% of the kinetic energy in wind.
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