Question

What is anemometer ? Uses.?how it works? Want answer in detail.! Urgent..!!

Answer 1

An anemomenter measures windspeed.
Can be uses at weather stations.
The have these cup looking objects attached and when the wind blows they begin to spin.  This spinning rate can determine the wind speed.

hope this is enough

Answer 2

An anemometer is an instrument  that measures the speed of wind. 
It is used in ranging weather predictions and measure wind's pressure whether the wind velocity is high or low.
An anemometer has cups on it and when the wind blows, they spin around and one of the cups in different color so you can count how many times the colored cup goes round. If it is a high number then, that means that the wind speed is high whereas if it is a low number then, it means that the wind speed is low.<span />