The contents of the primary school textbook on technology are as follows:
1. Make simple circuits: you can use batteries, light bulbs, copper wires, etc. to create simple circuits and observe the operating principles and phenomena of circuits.
2. Make a simple robot: You can use scrap materials like cardboard, iron boxes, electronic components, etc. to assemble a simple robot to learn the basic principles and skills of robot assembly.
3. Build a magnetic device: You can use strong magnets and small metal blocks to combine various interesting magnetic toys or devices to deepen your understanding of magnetism.
4. Make a simple windmill: You can use materials like cardboard, plastic, toothpicks, etc. to make a simple windmill and cunderstand the principle of converting wind energy into electrical energy and other forms.
5. Create a simple solar energy device: You can use solar panels to collect solar energy and create a simple solar energy device to understand the concept and application of solar energy.
6. Make a super crystal ball: You can use a mixture of boric acid, lye, and hot water, pour it into a small plastic ball, and after a few days you will be able to see beautiful crystals growing. in the ball.
What are the benefits of doing tech crafting?
1. Cultivate interest in science
Small science experiments can help primary school students understand the mystery and charm of science, thereby stimulating their interest in science. Curiosity and interest. Through experiments, they can experiencepersonally learn the laws of nature and scientific principles, and develop a strong interest in scientific knowledge. For example, by conducting wilting recovery experiments, primary school students can personally observe the leaf recovery process and understand the physiological characteristics of plants.
2. Promote cognitive abilities
Through scientific experiments, primary school students can explore natural phenomena and scientific principles, thus promoting the development of their cognitive abilities. The experimental process requires them to observe, record and analyze data, and to develop their observation, analysis and reasoning skills. For example, in gas expansion experiments, primary school students can observe the changes in gas expansion and understand the properties and characteristics of gases.az, thus promoting their cognitive abilities.
3. Develop experimental skills
Small science experiments can help primary school students learn basic operational skills in experiments, such as weighing, mixing, pouring, etc. . These experimental skills can develop primary school students' observation, thoroughness and experimental skills, and also lay the foundation for them to learn more complex science experiments in the future.
Safety precautions for hand-made solar fans
Hand-made solar cells 1. Make titanium dioxide film (1) Put first the titanium dioxide powder into a mortar and paste it Grind with the agent (2) Then slowly apply a film to the conductive glass with a glass rod (3) Put the titanium dioxide film into the lamp alcohol and sinter for 10at 15 minutes.Then cool it 2. Use natural dyes to color the titanium dioxide As shown in the picture, add 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. If the coloring of the film layer is uneven on both sides, you can put it on and soak it for another 5 minutes, then rinse it with ethanol. and dry it gently 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. Use a solution containing iodide ions as the electrolyte of solar cells. It 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 partsexposed 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.
Safety precautions for handmade solar fans are:
1. 502 glue is used in the experiment. Be careful not to get glue on your hands or other parts of the body to avoid. injury.
2. When using a utility knife, pay attention to safety and do not scratch your hand. Do not burn yourself with the soldering iron.
3. Solar cells can be connected in series or in parallel. When panels are connected in series, those with the same output current should be selected. When connecting battery panels in parallel, choose battery panels with the same output voltage. Whateverseries or parallel connection, the output power is equal to the sum of the output power of each battery panel.
4. When connecting solar panels in series or parallel, pay attention to their positive and negative poles. Do not bend it during use to avoid shorting the battery board.
5. This electric fan can spin at a faster speed only when exposed to sunlight. When the light intensity changes, the speed of the electric fan also changes.
6. If the small electric fan is placed in a windy location, you can also use the motor as a generator and replace the solar panel with a light-emitting diode, which will emit light.