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Definitions (113)
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wind shadow
A turbulent and/or low-wind-speed region downwind of (behind) an object such as a building, tower, or trees.
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rated wind speed
The lowest wind speed at which the rated output power of a wind turbine is produced.
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airfoil
The shape of the blade cross-section, which for most modern horizontal-axis wind turbines is designed to enhance the lift and improve turbine performance.
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alternator
An electric generator for producing alternating current. See also generator.*
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ambient
Of the surrounding area or environment; completely surrounding; encompassing. Used to distinguish environmental conditions, e.g. temperature or sound, from what is added by mechanical devices.*
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ampere-hour
A unit for the quantity of electricity obtained by integrating current flow in amperes over the time in hours for its flow; used as a measure of battery capacity.
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anemometer
A device to measure the wind speed.
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authority having jurisdiction
The building authority for the area, generally a city or county building department, including its inspectors.*
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availability
A measure of the ability of a wind turbine to make power, regardless of environmental conditions. Generally defined as the time in a period when a turbine is able to make power, expressed as a percentage.*
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average wind speed
The mean wind speed over a specified period of time.
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