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# Our sun device

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### Our sun device

1. 1. OUR SOLAR ENERGY DEVICE:<br />Solar collector<br />etwinningproject<br />
2. 2. When a three dimensional parabola is aimed at the sun, <br />all the light that falls upon its mirrored surface is reflected to<br /> a point known as the focus.<br />If a black cooking pot is placed at the focus it will absorb the light's energy and become very hot. <br />A satellite dish is an example of a parabolic that can be made into a cooker. <br />
3. 3. Diagram shows the unique reflecting  properties of the parabola . <br />
4. 4. The Mathematics<br />Using the rectangular coordinate system allows us to draw a picture and determine mathematically where the focus is located .<br />The focus can also be found by direct observation after <br />we have lined the dish with a reflective material. <br />Hold a piece of cardboard close to the center of the dish,<br /> then move it up and down toward the sun and back. <br />A circle of light will appear on the underside of the cardboard. <br />When the circle is smallest, the position of the focus is found.<br />
5. 5. We used a satellite dish from trush<br />
6. 6. a satellite dish….<br />the shape of a satellite dish could be called an elliptic paraboloid.<br /> By observing the shape through the perspective of each coordinate plane, one can see the two-dimensional curves that the elliptic paraboloid consists of. Parallel to the xy-plane is and ellipse, parallel to the xz-plane is a parabola, and parallel to the yz-plane is another parabola. The standard variable equations to these functions are:<br />Parabola: y = ax2 + bx +c<br />Ellipse: x2+ y2 = 1 <br />However, the structure of a satellite dish does not consist of an ellipse but a circle. In the equation of an ellipse, the square roots of a and b constitute the length of the lines parallel to their corresponding x- and y-axes, starting from its center. In order to form a circular paraboloid, a and b would have to be equal.<br />
7. 7. Unfixing the bracket<br />
8. 8. Some calculations<br />
9. 9. We used the most popular material used to line the dish :<br />A reflective, mirror, self-sticking aluminum paper. <br />
10. 10. Cutting to pieces…<br />
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15. 15. Finally the dish is ready<br />
16. 16. And it BURNS!!!<br />
17. 17. We can cook now …<br />
18. 18. You can watch the video in :<br />http://www.youtube.com/watch?v=hcpYMhgvtsA<br />