By Aurelio Baldor
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El conocimiento siempre termina por abrirse paso, como claramente nos muestra esta s? ntesis striking de los angeles trayectoria del pensamiento cient? fico, desde l. a. muy remota ? poca en que el hombre comenz? a hacer uso de instrumentos hasta nuestra ? poca -entre los siglos XX y XXI-- de grandes logros tecnol?
ENTRE EL TIEMPO Y los angeles ETERNIDAD (2ª ED. )
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Wind turns the blades of a turbine and generates electricity. 30 31 CHAPTER TEN Wind Farms What happens when you group several wind turbines in one location? You create a wind farm. Wind farms generate electricity for power grids. Power grids distribute electricity to many homes and businesses. Wind farms may have a few turbines, or hundreds of them. Depending on the number of turbines and their size, a wind farm generates enough electricity for hundreds, or even thousands of homes. 32 33 CHAPTER ELEVEN World Wind There are thousands of wind farms in more than 70 countries.
A German company builds the world's largest turbines, and has installed several of them. The giant machines are 453 feet (138 meters) tall. The diameters of the rotors are 413 feet (126m). The United States has been the leader in new installations for the past three years. The U. S. 8 gigawatts. 5 million homes. S. , and in the world. The Horse Hollow Wind Energy Center spans 47,000 acres. It has 421 wind turbines with a capacity of 735 megawatts. Fuel for Thought What is the world’s wind power capacity?
And in the world. The Horse Hollow Wind Energy Center spans 47,000 acres. It has 421 wind turbines with a capacity of 735 megawatts. Fuel for Thought What is the world’s wind power capacity? 8 gigawatts at the end of 2007. 37 CHAPTER TWELVE Advantages and Disadvantages Wind energy has many advantages. The biggest advantage is that wind energy is green energy.. Green energy is friendly to the environment. Wind turbines do not burn fuel. Therefore, they do not release harmful emissions into the air.