Electrical test box box portable test instrument physics experiment teaching junior high school school supplies supplies

Sliding rheostat is an important element in the circuit, it can change its position by moving the slide resistance, which play a role in the control circuit. In circuit analysis, the slide rheostat either as a fixed value resistor, can be used as a variable resistance value. Sliding rheostat configuration generally includes five parts terminal, slide, resistance wire, metal rods and ceramic cones. Sliding rheostat is one commonly used in electrical devices, it works by changing the length of the access circuit portion of the resistance to change in resistance line, thereby gradually changing current in the circuit size. Sliding rheostat resistance wire is generally high melting point, resistance large nickel-chromium alloy, metal rods are generally small metal resistance, so when the resistance is constant cross-sectional area, the longer the resistance wire, the greater the resistance, the shorter the resistance wire, resistance smaller. Sliding rheostat resistance wire material is generally copper or nickel-chromium alloy wire, the Kang copper or nickel-chromium alloy wire wound on an insulating tube, both ends with wire leads, rheostat slide contact resistance wire can be adjusted to two end distance, thereby changing the resistance of the resistive wire at both ends of the metal rod, which form a slide rheostat. There is a resistance material (such as carbonaceous material) "plated" on the insulating substrate, by the middle of the slide to adjust the sliding rheostat resistance. Taizhou Student teaching Ltd. belongs Student Education (China) Limited's focus on promoting the development of experimental equipment subsidiary. The company has consistently adhered to "quality first, customer first, quality service, integrity-based" business philosophy, with high-quality products, good reputation, high quality services, products sold nearly 30 provinces, municipalities and autonomous regions and exported to Asia, Europe and other countries. We are a major production physics experiment equipment company, main products are: electrical test equipment, mechanical testing equipment, optical test equipment and other middle school students physics experiment equipment. Our long-term and local education agencies to negotiate, how to increase the exchange of child achievement. We use imported high-quality plastic, with different companies use other plastics, they use low-quality junk plastic. Products in the factory, the company quality inspection departments strict product quality, product quality among the best in the industry, product bright colors, products work well. Innovation, product development departments continue to develop practical technology products ... in the development of product diversity, more emphasis on the cultivation of the child's ability, continue the idea of ??the novelty of the product, through innovation, to create plus children's hands, so that the physical discipline of children have a strong understanding of the child to learn to produce better physical interest. We hope that our products can help your children (students) bring a better interest in learning, so that children can correctly recognize the importance of this discipline, let the children know and recognize physical interest.