I am assuming that you want to make small-scale models for class-work? The simplest thing is to add propellor blades to a small DC electric motor. Connect the motor to a load instead of a battery (say, a small bulb or LED), and you can use ammeters and voltemeters to measure the power output. Your class can then investigate the best kind of blades to use on a wind turbine. Clamp the motor vertically, and you can also investigate vertical axis wind turbines (VAW turbines) such as the savonius.
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give me other idea
I suggest doing a search on Instructables for "windmill."