Question

essay on electricity production from wind energy​

Answer 1

Answer:

The unequal heating of the Earth’s surface by the sun is responsible for the circulation of air in the atmosphere. Air immediately above a warm area ex­pands. Being lower in density it is forced upwards by the cooler denser air flow­ing in the surroundings, resulting in wind.

As wind is caused by the unequal heating of the air it can be said to be an indirect form of solar energy. Wind energy is a renewable source of non polluting energy. It has tremendous potential which, if harnessed, can easily satisfy the energy demands of a coun­try.

Estimates reveal that two percent of the total solar energy falling on earth is converted to kinetic energy in the atmosphere. 30 percent of this kinetic energy occurs in the lowest 1000 m of elevation i.e. wind in this lowest kilometer has maximum kinetic energy which can be converted into mechanical energy which in turn can be utilized to generate electricity or to perform some other useful work. Since the energy possessed by wind is by virtue of its motion, so the de­vice used to extract its energy should be capable of slowing down the wind.

Wind energy conversion devices like wind turbines are used for converting wind energy into mechanical energy. Wind turbines consist basically of a few sails, vanes or blades radiating from a central axis. When wind blows against the blades or vanes, they rotate about the axis. This rotational motion is utilised to perform some useful work. By connecting the wind turbine to an electric generator wind energy can be con­verted into electric energy.

In India, winds are relatively low (5 km/hr to 15/20 km/hr) and vary appreci­ably with season. This makes the exploitation of wind energy an expensive project.

Answer 2

Answer:

• In areas which are very windy, windmills are erected.
• A windmill consists of a fan-like structure erected on a strong standing support at a considerable height.
• The strong wind moves the wings of the windmill and this turns the turbines of the electric generato This mechanical energy is converted to electrical energy.
• Since the output of a single windmill is very small, many such windmills have to be erected in a carefully chosen place where there is consistent blowing of winds of atleast 15km/hr. This is known as a wind energy farm which are generally large (2 hectares of land)

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