WAHS Wind Energy Vocabulary #1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| airfoil | the shape of the blade cross-section, to enhance the lift and improve turbine performance
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| ampere-hour | a unit to measure quantity of electricity, also measures battery capacity
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| anemometer | a device to measure wind speed
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| average wind speed | the mean wind speed over a specified time period
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| blades | the aerodynamic surface that catches the wind
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| brake | a system used to stop the rotor from turning
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| converter/inverter | a device that converts direct current (DC) to alternating current (AC)
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| cut-in wind speed | the wind speed at which a wind turbine begins to generate electricity
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| cut-out speed | the wind speed at which a wind turbine ceases to generate electricity
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| density | mass per unit of volume
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| downwind | on the opposite side from the direction from which the wind blows
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| furling | a passive protection for the turbine where the rotors fold up or around the tail vane
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| grid | the electricity utility distribution system, connecting generators to users
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| HAWT | horizontal axis wind turbine
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| VAWT | vertical axis wind turbine
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| kW | kilowatt, a measure of power for electrical current (1000 watts)
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| kWh | kilowatt-hour, a measure of energy equal to the use of one kilowatt in one hour
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| MW | megawatt, a measure of power (1,000,000 watts)
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| nacelle | the body of a propeller-type wind turbine, containing the gearbox, generator, blade hub, and other parts
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| O&M costs | operation and maintenance costs
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| power coefficient | the ratio of the power extracted by a wind turbine to the power available in the wind stream
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| power curve | a chart showing a wind turbine's power output across a range of wind speeds
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| PUC | Public Utility Commission, a state agency which regulates utilities
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| PURPA | Public Utility Regulatory Policies Act, referring to small generator utility connection rules
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| rated output capacity | the output power of a wind machine operating at the rated wind speed
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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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| rotor | the rotating part of a wind turbine, including the blades and blade assembly, or the rotating part of a generator
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| rotor diameter | the diameter of the circle swept by the rotor
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| rotor speed | the revolutions per minute of the wind turbine rotor
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| start-up wind speed | the wind speed at which a wind turbine will begin to spin
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| swept area | the area swept by the turbine rotor, A=pR2, where R is the radius of the rotor
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| tip speed ratio | dividing the speed at the tip of a moving rotor blade by the wind velocity
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| turbulence | the changes in wind speed and direction, frequently caused by obstacles
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| upwind | on the same side as the direction from which the wind is blowing (windward)
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| wind farm | a group of wind turbines, often owned by one company (aka "wind power plant")
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| yaw | the movement of the tower top turbine that allows the turbine to stay into the wind
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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