Wind energy is a form of solar energy. Wind energy (or wind power) describes the process by which wind is used to generate electricity. Wind turbines convert the kineticenergy in the wind into mechanical power. A generator can convert mechanical power into electricity.

Things reqired :-

1- Wood or cardboard ( to make the shape)and paper (to model)

2-Dynamo(converts mechanical energy to electrical energy)

3-LED

4-Few wires

5- 4 Blades

Step 1: Constucting the Shape

The tower will serve as the base of your

windmill and can be crafted from anything that will hold it solid and steady, from wood beams to a weighted quart jug.

The tower must be tall enough to keep the blades of the windmill from touching the ground as they spin. This will also depend on the length of your blades.

For a traditional looking Dutch-style windmill, you can cover the base
in cardboard, construction paper, or even make bricks from sugar cubes to make it resemble a miniature structure. This is also a means for concealing the DC motor inside the windmill for a more attractive finished model

Step 2: Building the Blades

The blades will catch air and spin to power your

windmill. They should be fairly light and positioned on a slight angle to better catch wind.

Pre-made blades could be used from a small fan or a pinwheel toy. You could cut blades in your preferred shape from cardboard or balsa wood. For the authentic windmill look, bend the blade shape out of wire, then cover them with tissue paper or a lightweight fabric.

The blades must be joined in the center around an object that can be mounted onto the spindle of your Dynamo (basically functioning like a wheel on an axle). This could be a wooden disk with a center hole drilled in, or even a piece of cork.

Most model windmills utilize 4 evenly spaced blades

Step 3: Attach the Dynamo.

These small,dynamos can be purchased from few electronics stores . The size of the dynamo will depend on the size of your windmill, but most dynamos are 1.5 to 4.5 volts. When attached to a windmill at the spindle, the spinning blades create an electrical current within the dynamo. If the dynamo is wired to a light bulb (and if you are creating enough electricity) the bulb will light up.

·
Securely mount the dynamo to the top of the windmill's tower with the spindle facing forward and extending over the front edge. You may need to extend the length of the spindle (or replace it with a longer axle) so that your blades can spin freely without hitting the tower.

Step 4: Attach the Windmill Blades

The blades will be mounted onto the spindle (metal point) of the Dynamo. The mounting must hold the spindle securely so that it spins smoothly as the blades turn.

Step 5: Connect the Dynamo to an LED Light.

This will allow the electricity generated in the motor to light up the LED.

· Use two wires (preferably copper at least 6 inches (15 cm) in length). Connect each wire separately to the two leads on the back of the dynamo. Each lead should have one wire connected to it.

·
Connect the other end of the wires to the two ends of an LED light, with one connected to the negative terminal and the other connected to the positive terminal.

·
Test the connection by quickly spinning the blades of the windmill to light up the LED.