The simple and beautiful ways to make technological crafts are as follows:
1. Make a cup. The tumbler is a classic toy that can stand anywhere thanks to the principles of center of gravity and balance. You can use cardboard, glue, colored pens, eggs and other materials to make a cup. The specific steps are as follows: Poke a small hole in the bottom of the egg and slowly pour the liquid from the egg into the bowl. Then cut the cardboard into a round shape and roll it into a cone shape. Then insert the cone-shaped cardboard into the egg shell and secure it with glue. Finally, draw your favorite pattern or text on the top of the cup and that's it.
2. Make a phone in the shape of a paper cup. The paper cup telephone is a simple communication tool that can communicate between two people through transmission.we have sound. You can make a paper cup phone using two paper cups, a piece of cotton thread, and a pair of scissors. The specific steps are as follows: poke a small hole in the bottom of the two paper cups, then pass the cotton thread through the two small holes and tie it with a knot. Then add some water into each paper cup, then you can use this paper cup phone to make calls.
3. Make a solar wind turbine. A solar wind turbine is a device powered by solar energy, which can rotate in the sun and emit a clear sound. You can make a solar wind turbine using a CD, colored cardboard, glue and scissors. The specific steps are as follows: Place a CD on a piece of colored cardboard and use scissors to cut out four symmetrical shapes. Then glue these four shapes onto the CD to form a pinwheel shape. Fi nallyn, pass a wooden stick through the center of the CD disc and place it in the sun to spin it.
The role of manufacturing technological crafts:
1. Cultivate creativity: Making technological crafts requires the use of personal creativity and imagination. From design to production to material selection, designers must think independently and try, thereby cultivating unique innovative thinking.
2. Improve problem-solving abilities: During the production process, you may encounter various problems, such as poor material selection, unskilled production technology, etc. This requires creators to find ways to solve problems and improve their problem-solving skills through continuous attempts and fixes.
3. Improve practical ability: productiontion of technological handicrafts requires certain manual skills and operational abilities. Through continuous practice and attempts, one can improve one's practical ability and fine operational skills.
4. Encourage teamwork: During the production process, you may need help from other people or to complete certain tasks together. This promotes teamwork and improves teamwork.
5. Stimulate scientific interest: The production of technological crafts often involves the application of certain scientific principles and techniques. Through production and observation, people can be encouraged to become interested in science and improve their scientific knowledge.
How to make simple solar panels at home
MIT StudentsThere is an invention in which a used beverage bottle is filled with water, ininjected with a small amount of formalin, then placed on a piece of iron, installed on the roof and transformed into a 55 watt energy-saving lamp. Today, this invention, called a solar drink bottle bulb, has brought light to 1,000 poor Filipino families.
The first “solar beverage bottle bulb” can indeed “provide lighting in a dark room during the day without consuming electricity”
The second “bulb” can be compared; energy-saving lamps turned on? Limited by the experimental conditions, the feeling is not obvious. Formalin can improve the illumination ability of the "light bulb", but the specific improvement cannot be demonstrated at present;
The working principle of the third "light bulb" is probably to "to gather the external light and refract it". in subdued light "indoors, providing more uniform lighting."
Question: This “bulb” is so bright but doesn’t use any electricity, so where does the light come from?
Answer: Light bulbs cannot emit light, but they can “focus” light, collecting and refracting outside light into the room, providing basic lighting for rooms without windows.
Question: What is the iron plate used for?
Answer: The iron plate can fix the “bulb” and can also reflect sunlight into the bottle, improving the “light gathering” ability.
Question: What is formalin used for?
Answer: Formalin can increase the refraction of light by the solution in the bottle, and it can also have a sterilizing effect to prevent the water in the bottle from becoming smelly.
Question: What are the disadvantages of this "light bulb"?
Answer: Formalin solution is not easy to purchase, and the ampoule cannott be used only during the day, not at night; when installed on the roof, gaps are prone to leaks.
How to make a solar heating cup by hand
Handmade solar cell 1. Make titanium dioxide film (1) First put the titanium dioxide powder titanium in a mortar and grind it with the adhesive (2) Then use a glass rod to slowly apply a film to the conductive glass. (3) Put the titanium dioxide film under an alcohol lamp to sinter for 10-15 minutes, then cool it. 2. Use natural dyes for coloring. titanium dioxide as shown in the figure. Put fresh or frozen black plums, mountain plums, pomegranate seeds or black tea, add a tablespoon of water and squeeze, then put the titanium dioxide film for coloring, it will take about 5 minutes until the film layer turns dark purple ifthe film layer is colored on both sides. If it is uneven, you can put it in and soak it for 5 minutes, then rinse it with ethanol and gently dry it with soft paper.
3. Making the positive electrode colored by the dye is the electrode from which the electrons come out (the negative electrode). The positive electrode may be composed of a conductive surface of conductive glass (covered with a conductive film of SnO2). You can use a simple multimeter to determine which side of the glass is conductive. You can also use your fingers to make a judgment. the conductive surface is rough. As shown in the picture, mark the non-conductive surface with "+", then use a pencil to evenly apply a layer of graphite to the conductive surface. 4. Add electrolyte and use iodide ion The ion solution is used as the electrolyte of solar cells and is mainly used to reduce and regenerate dyes. As the picture shows, just add one to two drops of electrolyte on the surface of the titanium dioxide film. 5. Assemble the battery. Place the colored titanium dioxide film face up on the table, drop one or two drops of electrolyte containing iodine and iodide ions onto the film, and then press the conductive side of the positive electrode face down onto the titanium dioxide. movie. Offset the two pieces of glass slightly and use two pliers to tighten the battery. The exposed parts of the two pieces of glass are used to connect the wires. This way your solar cell is ready.
6. Battery Test Under outdoor sunlight, check whether your solar cell can generate current.
How to make a solar water heater manually?
The principle of solar cells
http://hi.baidu.com/diydz/blog/item/e16710340180bf385bb5f508.html
Solar TiO2 dye sensitized handmade cells
http://hi.baidu.com/diydz/blog/item/5244f13d5df814c49f3d62e3.html
Supplementary response
< p>1. Preferably an iron box), a small can (must be metal), foam, a reflective plate (you can use aluminum foil from a cigarette box, a mirror, an old CD ...), tape, black paint, cellophane.2. Boxes and small cans should be painted black (this can absorb more heat, as black can absorb light). Dig a hole in the foam (also painted black) just enough to insert vertically. the small box contains 3/5 (acts as thermal insulator to prevent heat dissipation), 2/5 is exposed outside to receive sunlight. Put the foam and the small box in the box, seal it with cellophane and make a support. frame behind the box so that theThe box can face the sun. Place it diagonally and install reflectors on the back, top, left and right of the box. The reflectors underneath can be placed directly on the ground in front of the box (the box). the larger the reflectors, the better, as they can absorb more light and heat). The reflected light should be able to shine on the box or small tank so that the box and small tank can absorb more heat. is made.
Use a drink can and spray it with black paint (wrapping it in a layer of black paper will also work). Put it in the sun, it is the simplest and most primitive solar water heater.
Method 1: Use a drink can and spray it with black paint. Placed under the sun, it is the simplest and most primitive solar water heater.
Method 2: 1. Fill a plastic bottle (preferably a bottleof drink) with an appropriate amount of water. 2. Prepare some mirrors. 3. Place mirrors around the plastic bottle and place it in the sun. .According to the reflection principle, water can be heated.
Solar water heater is a heating device that converts solar energy into thermal energy. It can heat water from low temperature to high temperature to meet thermal needs. people in life and water production.