what is wind energgy and what are its drawback?

Answer 1

Wind power is the conversion of wind energy into more useful forms, usually electricity using wind turbines. In 2005, worldwide capacity of wind-powered generators was 58,982 megawatts, their production making up less than 1% of world-wide electricity use. Although still a relatively minor source of electricity for most countries, it accounts for 23% of electricity use in Denmark, 4.3% in Germany and around 8% in Spain. Globally, wind power generation more than quadrupled between 1999 and 2005.

http://en.wikipedia.org/wiki/Wind_power

Drawbacks
Ecological Footprint
The clearing of trees may be necessary since obstructions reduce yield, though this is obviously not the case with most already-cleared farmland sites.
Wind turbines should ideally be placed about ten times their diameter apart in the direction of prevailing winds and five times their diameter apart in the perpendicular direction for minimal losses due to wind park effects. As a result, wind turbines require roughly 0.1 square kilometres of unobstructed land per megawatt of nameplate capacity. A wind farm that produces the energy equivalent of a conventional power plant might have turbines spread out over an area of approximately 200 square kilometres. A nuclear plant of comparable capacity would be surrounded of a 100 square kilometre exclusion zone, and strip mines supplying coal power plants claim large tracts of land. Though restrictions in land use possibilities are different in the three cases, the area needed for wind farming is not excessive compared to conventional power.[35]

A wind turbine at Greenpark, Reading, EnglandWindmills kill birds, especially birds of prey. Siting generally takes into account known bird flight patterns, but most paths of bird migration, particularly for birds that fly by night, are unknown. Although a Danish survey in 2005 (Biology Letters 2005:336) showed that less than 1% of migrating birds passing a wind farm in Rønde, Denmark, got close to collision, the site was studied only during low-wind non-twilight conditions. A survey at Altamont Pass, California conducted by a California Energy Commission in 2004 showed that turbines killed 4,700 birds annually (1,300 of which are birds of prey). Radar studies of proposed sites in the eastern U.S. have shown that migrating songbirds fly well within the reach of large modern turbines. Many more birds are killed by cars, and this is a widely accepted cost {POV}.
A wind farm in Norway's Smøla islands is reported to have destroyed a colony of sea eagles according to the British Royal Society for the Protection of Birds.[36] The society said turbine blades killed nine of the birds in a 10 month period, including all three of the chicks that fledged that year. Norway is regarded as the most important place for white-tailed eagles.

Answer 2

Energy can be extracted from the wind by turbines and used to generate electricity.

Drawbacks:

Unsightly particularly in areas of natural beauty (can drastically change the look of a landscape)

When there is no or little wind back up generation is required adding to already substantial capital costs

Output depends on a good windy site

Some concerns about birds killed when flying into the large rotating blades

Answer 3

The extraction of kinetic energy from the wind and conversion of it into a useful type of energy: thermal, mechanical, or electrical. Wind power has been used for centuries.

It has been estimated that the total wind power in the atmosphere averages about 3.6 × 1012 kW, which is an annual energy of about 107,000 quads (1 quad = 2.931 × 1011 kWh). Only a fraction of this wind energy can be extracted, estimated to be a maximum of 4000 quads per year. According to what is commonly known as the Betz limit, a maximum of 59% of this power can be extracted by a wind machine. Practical machines actually extract from 5 to 45% of the available power. Because the available wind power varies with the cube of wind speed, it is very important to find areas with high average wind speeds to locate wind machines. See also Wind.

Most research on wind power has been concerned with producing electricity. Wind power is a renewable energy source that has virtually no environmental problems. However, wind power has limitations. Wind machines are expensive and can be located only where there is adequate wind. These high-wind areas may not be easily accessible or near existing high-voltage lines for transmitting the wind-generated energy. Another disadvantage occurs because the demand for electricity varies with time, and electricity production must follow the demand cycle. Since wind power varies randomly, it may not be available when needed. The storage of electrical energy is difficult and expensive, so that wind power must be used in parallel with some other type of generator or with nonelectrical storage. Wind power teamed with hydroelectric generators is attractive because the water can be used for energy storage, and operation with underground compressed-air storage is another option. See also Electric power generation; Energy sources; Energy storage.

The most common type of wind turbine for producing electricity has a horizontal axis, with two or more aerodynamic blades mounted on the horizontal shaft. With a horizontal-axis machine, the blade tips can travel at several times the wind speed, which results in a high efficiency. The blade shape is designed by using the same aerodynamic theory as for aircraft

Answer 4

Wind energy involves harnessing wind to turn something that can do work. Dutch windmills are early examples. Modern versions involve wind vanes that run a generator to make electricity. Upsides: free energy, no pollution, low cost. Downsides: only as reliable as the wind, generators can be loud and some consider them eye-sores that interfere with the view since you typically want them on hill tops and ridges.

Answer 5

Wind energy is the energy present in the flow of air around the earth. The wind is driven by the temperature and pressure differences in the atmosphere arising from heating of the earth by the sun and it is further guided by topography. The energy stored in the atmosphere is in three forms, kinetic, potential, and thermal. They all play a part in the motion of wind, but the main interest is in the kinetic energy from the wind's motion.

Answer 6

wind energy is the harnesing of mechanical energy of the wind using a windmill and converting the mechanical energy into an electrical energy.

it is a safe way of attaining power
no pollution and detriment to the environment

Answer 7

Wind energy is energy possessed by wind (kibetic)
We can use it in wind mills
Wind mills can be connected to elec. generators

Drawbacks
Usually wind is more on hilly (beautiful) areas so when we install hundreds of mills over there , they cause viual polution (dont look like beautiful)

Answer 8

Wind vane generators, big out west. You need constant wind to get output!