... are elusive, but humankind has been using wind for transportation since before recorded history. It has been claimed that the Chinese invented the windmill two centuries before the Common Era (B.C.E) in order to pump water from wells. The first recorded case of windmills was in the ... the twentieth century. Millions were erected as the American West was settled throughout the nineteenth century (Bergey,1990). Most of these windmills were built on farms and ranches for mechanical power. By the turn of the twentieth century, the search for power led several countries to attempt ... windm...

• Word Count: 3789
• Approx Pages: 15
• Has Bibliography
• Grade Level: Undergraduate

... fossil fuel is hydropower. "Hydro electricity is generated through water pressure. Hydroelectricity energy is one of the cleanest and cheapest alternative sources. Power stations that contain turbines and generators are built near the downstream side of the dam. Pipes or channels are then used to direct water from the storage to the stations. Within the station, water pushes the turbine that ... used to capture wind and turn it into electricity. There are two types of turbines used: horizontal-axis wind turbines and vertical-axis wind turbines. Horizontal-axis turbine looks like a windm...

• Word Count: 3357
• Approx Pages: 13
• Grade Level: High School