Resource: Wind Story

Print Background Essay

A wind turbine works the opposite of a fan. Instead of using electricity to make wind, like a fan, wind turbines use wind to make electricity. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity. The electrical power is sent through transmission lines to a substation and then on to customers who need it.

The uneven solar heating of the earth generates wind. The faster the speed of the wind, the more energy we can capture. For ages humans have captured the power of the wind using windmills to turn shafts and sails to propel boats. Wind turbines are modern versions of these older technologies. This animation from the U.S. Department of Energy explains the how each part of a commercial wind turbine works to turn kinetic energy into electricity.

The size of the turbine and the velocity of the wind are strong factors in how much energy a wind turbine can produce. Turbines like the one in the animation are often grouped into wind farms that produce large amounts of electricity. As more and more wind farms have sprung up, wind energy production has increased rapidly, growing 26.6% worldwide and 45% in the United States in 2007.1

One of the best ways to understand how a wind turbine works is to build one. The Kid Wind website (www.kidwind.org) is a comprehensive resource for getting kids excited about wind energy and helping educators to think and work through the details of experimenting with table-top wind turbines in the classroom.

To learn more about efforts in Pennsylvania to produce electricity using wind power, check out the video Invalid resource code: psu06.energy21.sci.wind.

To see how solar and wind power are converted into electricity on a small scale, watch Dr. Andrew Lau's explanation in the video Invalid resource code: psu06.energy21.sci.energysystem.

In this interactive Invalid resource code: psu06.energy21.sci.windfarm, a construction project manager explains the process of constructing a wind farm, its challenges and benefits.

1Kid Wind Project. “Wind Power Basics.” http://www.kidwind.org/lessons/BBwindpowerbasics.html, accessed 18 August 2008.

Print Questions for Discussion

• Note the parts in this animation that are related to yaw. For ships, yaw means to swerve off course momentarily or temporarily. Pilots routinely talk about the roll, pitch and yaw of a plane. Click on yaw-related parts of the wind turbine to find out why yaw is important to the function of a wind turbine.
• Think about shifting your bicycle from a low gear to a higher gear and how that shift affects your effort and your speed. Then look at the gear box in the animation. Discuss how gears on your bicycle are similar to or different from the function of gears on a wind turbine.
• What device sends information to the controller about current wind speed? If hurricane strength winds blow through a wind farm, is there a safety function? Click through the components to see. If there is no safety function, what might happen to the wind farm and surrounding communities?