Homemade solar cooker
1. Find a concave reflective bowl on a large flashlight and use rigid foam plastic or wood to cut a cylinder about 4 cm long with a diameter which can be adjusted well. It's better to insert it into the round hole of the reflective bowl.2. Drill a thin hole transversely in one end of the cylinder, insert a wire with a diameter equal to the diameter of the hole, then bend both ends of the exposed wire 90°. , leaving 5 cm on each side.
3. Insert the cylinder into the round hole of the reflecting bowl, then insert both ends of the wire into a piece of foam plastic or a wooden base plate.
4. Sharpen both ends of a thin bamboo stick, insert one end into the cylinder in the center of the reflecting bowl, and insert a small piece of potato into the other end. Place the device in the sun, with the reflective bowl facing thesun.
5. Then, patiently adjust the length of the bamboo stick so that the inserted potato is exactly in the focus of the light.
It won't be long before the potatoes are baked in the sun and become fragrant.
Solar fan
Requires hardware, solar motor, good friends, 6 screws, wires, iron sheets (with holes, 2 pieces), rechargeable batteries and fans.
1. Parallel connection, solar panels, each panel has a positive pole and a negative pole, just connect the positive pole of one to the negative pole of the other, that's it.
>2 , Fix the solar panels on the wooden board;
3. Find a way to erect the wooden plank. I used assembly toys to do this. It is best to set the elevation angle of the solar panel. according to the position of the sun;
4. Place the motor on the teaching aid and secure it;
5. EffeTurn off the switch and check the transmission line
.6. Connect the line.
Reference link http://et.rouding.com/book/23710