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Read the Following Selection
Read about using wind to produce electricity, or click on the play button below to listen aloud.
Using Wind to Produce Electricity
People have used wind power for centuries. Early windmills turned grinding stones that crushed grain into flour. Today we use windmills to create electricity.
How Wind Turbines Work
You can think of a wind turbine as the opposite of a fan. A fan uses electricity to make its blades turn, and the turning blades produce moving air. A wind turbine uses moving air (wind) to turn its blades. The movement of the blades produces electricity.
1. Wind turns the windmill’s blades.
2. The blades turn the main shaft (rod) attached to them.
3. Gears in the gear box speed up the spinning motion. The second shaft then spins even faster. The faster the magnets spin, the more electricity is produced.
4. The turbine shaft and magnets spin very quickly inside the generator.
5. As the magnets spin, charge builds up in coils of copper wire. This creates electricity.
6. The electricity travels along wires to where it is needed.
A wind farm is a place that has a lot of wind turbines. The area must be flat and open, with a lot of wind. A wind farm can be built over water, such as a lake or ocean.
Advantages of Wind Turbines
• create electricity
• do not create pollution
• many possible locations
Disadvantages of Wind Turbines
• can be seen from quite far away
• turning blades can kill or injure birds and bats
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1. Why should wind turbine blades be very lightweight?CorrectIncorrect
2. Wind turbines do not pollute the environment when they operate. But the metal, concrete, and other materials used to make them must be produced. The turbines must also be built and sent to the site. How can producing these materials affect the environment?
Great answer!Great answer!
Type your response above.
3. Fill in the blank using information from the text.
A wind farm is a place that has a lot of wind .
4. Electricity turns the windmill’s blades.CorrectIncorrect
5. Fill in the blanks using information from the text.
The turbine shaft and spin very quickly inside the .