Harnessing Wind Energy :: physics power energy green environment clean

Living in Rural Alaska is very expensive because of its separated location. It would be even more expensive if energy, mail service, and other services were not subsidized by the state of Alaska. In the late seventies and previous(predicate) eighties, the state of Alaska looked for ways to cut the high cost of subsidizing diesel fuel for generating electric caral power to rural Alaska. It was during this time that wind energy was taken into musing as a source of electrical power.The earliest known uses of wind power date back to 3000 BC, when people used wind to sail ships. round 4000 years later, windmills were used in Europe to grind tobacco, wheat, and other grains. Later, in the 1700s, windmills were then used to pump water. It was not until the 1900s that wind mills were used for generating electric power. In the United States, windmills were used prior to widespead electrical distribution.The generation of wind can be traced back to solar energy. It is ultimately a renewab le and light(a) energy source. This is what makes it attractive to many as a source of energy for power plants. thread is created as a result of pressure differences in the aviation which is caused by temperature differences of radiating solar energy. Other detailors that contribute to the flow of air (wind) is the rotation of the earth, and its terrain. We could expect more wind over bodies of water since water provides less(prenominal) resistance to wind than do objects on the draw near of the earth.If wind is essentially free, why dont we see more windmills? The reason is that wind doesnt blow whenever we need power. Wind energy can only be stored in batteries and much of the energy from wind can not be harnessed into useful energy. The public too views wind generators as an eyesore on the landscape.Wind, initially is in the form of kinetic energy, thus it has the equation 1/2mv2, where m is the mass, and v is velocity of the air. Using the fact that the mass is equal to the gaudiness times the density, we can rewrite the equation for kinetic energy ask.e. = 1/2Vpv2, where V is the volume, and p is the density of air.Furthermore, the volume through a surface is equal to the area of the surface times the velocity of the air, times the time, thus the equation becomesk.e. = 1/2pv3At, where A is the area of the surface and t is the time.