The two-way switch is achieved by combining two independent single-pole double-throw switches. Nowadays, almost every brand and series of switches have single-pole and double-pole options, and the double-pole is the circuit diagram of the so-called double-control switch that we are using here. The double-control switch is achieved by combining two independent single-pole double-throw switches. Nowadays, almost every brand and series of switches have single-pole and double-pole options, and the double-pole is the circuit diagram of the so-called double-control switch that we are using here.
Parallel Circuit Divergence Principle:
LED light 1 and LED light 2 are in parallel, and the current in the main circuit is I. The currents flowing through LED light 1 and LED light 2 are I1 and I2, respectively. Obviously, I1 + I2 = I, and I1 * R1 = I2 * R2.
Solve, I1 = I * R2 / (R1 + R2) I2 = I * R1 / (R1 + R2) Therefore, I1:I2 = R2:R1
In other words, the current in the branch with a larger resistance is smaller, while the current in the branch with a smaller resistance is larger.

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.

Switch: A device for turning on and off power supply.

Experimental steps:
1. Experiment preparation: Understand the experimental equipment: screw hole plate, switch, wire, LED light, battery box, screwdriver, diagonal pliers.

Experiment Report:
Understanding the application of double-control series parallel circuits in daily life, understanding the principles, and laying a solid foundation for future circuit exploration.

Company Profile

 Chiluo 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 and a backbone enterprise of Zhejiang Province Teaching Equipment. 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.

 Chilvog 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, join hands to progress, and devote our utmost efforts to education, dedicated to the cause of education.

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