Future Farmers of America (FFA) Agronomy Career Development Events (CDE) Practice Exam

An anemometer is primarily used for measuring the speed of wind, making it an essential tool in various fields including meteorology, aviation, and environmental science. It functions by utilizing rotating cups or blades that spin in the wind, with the speed of rotation correlating directly to the wind velocity. Accurate wind speed measurements provided by an anemometer can inform weather predictions, assist in agricultural practices, and enhance safety measures in outdoor activities.

The other choices refer to different instruments or devices. The first option relates to energy conversion, which is outside the scope of what an anemometer does. The third option describes a machine used to harvest crops, and the last option pertains to equipment used for irrigating crops. Each of these instruments serves a unique function and does not pertain to wind measurement, underscoring the anemometer's specialized role in environmental observations.