Power from the wind has become an increasingly popular option for electricity generation. Unlike traditional energy sources such as coal, oil, and gas that contribute large quantities of carbon dioxide to the atmosphere, wind power relies on a non-polluting, renewable, ever-present resource—the wind. In recent years, the cost of harnessing energy from the wind has become more affordable making it a viable alternative for many communities.
A wind turbine generally consists of a two- or three-bladed propeller made of aluminum or fiberglass mounted on the top of a tall tower. It converts energy from the mechanical energy of moving air to electrical energy by means of a generator. The wind causes the shaft of the turbine to spin which in turn causes a generator to produce electricity.
In this experiment, you will measure the power output of a wind turbine, investigate the relationship between power output and wind speed, and determine the relationship between power output and rotor shape.
You will use a small motor as a generator and a pinwheel as the turbine. The power output of the pinwheel can be determined by measuring the current and voltage produced by the motor. Power is determined using the relationship
In this experiment, you will
Use a Current Probe to measure current output.
Use a Voltage Probe to measure voltage output.
Calculate power output.
Determine the relationship between power output and wind speed.
Determine the relationship between power output and rotor shape.
Sensors and Equipment
This experiment requires each of the following Vernier sensors and equipment (unless otherwise noted):
Step-by-step instructions for computer-based data collection
List of materials and equipment
Note: The experiment preview of the computer edition does not include essential teacher information, safety tips, or sample data. Instructions for Logger Pro and other software (such as LabQuest App or TI handheld software, where available) are on the CD that accompanies the book. We strongly recommend that you purchase the book before performing experiments.