Running Water Flashlight Course Presentation
LED, also known as light-emitting diodes, are made from compounds of gallium (Ga), arsenic (As), and phosphorus (P). Currently, LEDs combined with corresponding driving circuits are widely used in energy-saving light bulbs for street lamps, offices, and electronic products. LED energy-saving lamps use high-brightness, hat-shaped white light-emitting LEDs as light sources, which have the advantages of high luminous efficiency, low power consumption, long life, and environmental protection. They are ideal cold light sources for future lighting and are the choice for future home lighting sources.
LED energy-saving lamps are caused by the field emission of light, which belongs to a cold light source. The light is soft, has good color rendering, low heat generation, low temperature, and has a service life of over 100,000 hours, which is dozens of times that of ordinary incandescent bulbs. They are generally not damaged.
Energy-saving lamps have significant advantages over common incandescent and fluorescent lamps. The LED energy-saving lamp has an illumination efficiency of over 90%, while the efficiency of a common incandescent lamp is only about 20%, and that of a common fluorescent lamp is only about 40%. Therefore, LED energy-saving lamps have the significant advantage of high efficiency and energy saving. The LED energy-saving lamp flows with direct current, and the brightness of the light is constant, without flickering, which is beneficial to the protection of the user's eyes and has the function of protecting the eyes.
Experimental Cognition
Battery box: As the name suggests, it is a box used to install and fix the batteries, which is a device for outputting battery power.
LED lights: LED stands for Light Emitting Diode, which is a solid-state semiconductor device that can directly convert electricity into light. The heart of an LED is a semiconductor wafer, with one end attached to a substrate and the other end connected to the positive terminal of the power source, enclosing the entire wafer in an epoxy resin. The semiconductor wafer consists of three parts: one is a P-type semiconductor, where holes dominate, and the other end is an N-type semiconductor, where electrons predominate. Typically, there is one to five quantum wells in the middle. When an electric current flows through the wire to act on the wafer, electrons and holes are pushed towards the quantum wells, where they recombine. This results in the emission of energy in the form of photons, which is the principle of LED light emission. The wavelength of the light, which is the color of the light, is determined by the material that forms the P-N junction.
Triode: When the triode operates in the amplification region, the collector current and the base current are essentially in a fixed ratio. The so-called amplification function of the triode is actually based on this fixed ratio, allowing a small current (the base current) to control a larger current (the collector current).
Resistance: The resistance of a conductor to the flow of current is called resistance! Factors affecting the size of resistance: length, cross-sectional area, material, temperature, and so on. Generally, for metal materials, resistance increases with temperature.
IC: is a control IC specially designed for single-chip machine driving, which integrates two circuits: step instruction and loop instruction.

Experimental steps:
1. Experiment preparation: Understand the experimental equipment: screw hole plate, IC, transistor, LED light, resistor, wire, screwdriver, slant-nose pliers.

Experiment Report:
Understanding the working principle of the flowing water flashlight and making a energy-saving lamp by yourself, is it more deeply understood how the energy-saving lamp comes from?

Company Profile

 AiGou Toy Factory was established in 2007. After ten years of unremitting efforts, our company has gradually matured; Our company is a member of the National Ministry of Education Teaching Equipment Industry Association, a backbone enterprise of Zhejiang Province's teaching equipment, and the company has been awarded the "Heavy Contract and Credit-Keeping" unit for three consecutive years by Yiwu City. In 2014, it was designated by the Zhejiang Provincial Education Bureau as the "Culture and Popularization Experiment Equipment Fixed-point Production Unit".

AiGou Company is a high-tech enterprise that integrates modern scientific research and development, educational equipment, curriculum design, teaching resource integration, and technical services. AiGou, with its high-tech products, is a professional enterprise in the development and production of popular science experiment teaching materials in the country. The products are exported to Europe and the United States.
 After years of accumulation, the company has initially reached a certain scale. In terms of technological innovation, the company has professional design personnel engaged in the development of scientific education products and the upgrade and replacement of existing products. In terms of production, management, and service, the company strictly implements the standards of the ISO9001 international quality assurance system. In marketing, the AiGou products have been entered into many provinces and cities in the country and enjoy a good reputation. For many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the educational community. With excellent, high-quality professional talents and perfect after-sales service, it ensures the excellence of product quality and establishes a good corporate image. The scientific education physical series, chemical series, photovoltaic, wind energy, geography, biology, art and other products of Qiquan have successfully won bids in the education bureau tenders many times.

 AiGou Company continues to adhere to the business philosophy of 'quality first, service to diligence, honesty in conduct', providing excellent equipment and high-quality service for school teaching and research. We are willing to work diligently with new and old friends at home and abroad, work together, and devote our utmost efforts to education, dedicated to the cause of education.

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