Half-gallon milk or juice container (the paper kind, not the plastic kind)Rocks or sandSharp pencil or penStraight straw (do not use the ones that bend at the top)Wine bottle corkPinwheel toyPaperclipWhite thread  

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Take a stick and fix it vertically on a card board.Attach a portable electric motor above the stick.Also attach a pinwheel to the motor.Now connect the wires from motor to Multimeter(which detects smallest units of electricity) or a LED bulb to the ends of wires.

           When wind is blows the pinwheel rotates and the mechanical energy is converted into electrical energy in the motor which makes the LED to glow.
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