A sliding rheostat for experimental teaching

Abstract

The invention belongs to the technical field of teaching aids, especially a sliding rheostat for experimental teaching, comprises a device body assembly, a measuring assembly, a storage assembly and adisplay assembly, wherein the device body assembly comprises a device body, a fixing frame, a porcelain cylinder, a terminal coil, a terminal post and an indicator lamp; the fixing frame is fixedly installed on the outside of the device body; Convenient for the staff to observe the experiment scale, the sliding ring is a circular ring structure, so that that diameter is lar than that of the slidebar, so that that slide is smoother, by providing a mounting seat at the inner right end of the terminal barrel, An indicator lamp is installed on the mounting base. When the lead wire is connected to the upper end or the lower end at the same time, the indicator lamp will display, prompt the worker, and at the same time, the indicator lamp will become a temporary electric appliance, thereby avoiding the damage of the electric appliance, improving the use efficiency of the sliding rheostat, and further improving the use safety and stability of the sliding rheostat.

Description

technical field [0001] The invention belongs to the technical field of teaching aids, and more specifically relates to a sliding rheostat for experimental teaching. Background technique [0002] The sliding rheostat is a circuit element, which can change its own resistance by changing its own resistance, so as to play the role of controlling the circuit. In circuit analysis, the sliding rheostat can be used as a fixed value resistor or a variable value resistor. The sliding rheostat is an electrical One of the commonly used devices in China, its working principle is to change the resistance by changing the length of the resistance wire connected to the circuit, thereby gradually changing the size of the current in the circuit. The resistance wire of the sliding rheostat is generally nickel with high melting point and high resistance. Chromium alloy, the metal rod is generally a metal with low resistance, so when the cross-sectional area of ​​the resistance is constant, the l...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sliding rheostat for experimental teaching, to solve the problem that when the original sliding rheostat is used in experimental teaching in the above background technology, the teacher needs to use an external scale to measure the resistance value of the rheostat, which is inconvenient to use. , and under special circumstances, if the sliding piece is connected to two upper ends or two lower ends at the same time, a short circuit may occur, causing damage to the electrical appliance, reducing the service life of the electrical appliance, and reducing the safety and stability of the sliding rheostat. In the teaching process, due to the small size of the sliding rheostat, the teacher needs to perform multiple demonstrations according to the needs of the students and move the position and direction of the sliding rheostat to match the students in different positions during the teaching demonstration, which reduces the teaching efficiency and teaching quality. , the problem of increasing the teaching workload of teachers

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