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滑动变阻器是通过改变其阻值来改变电路中电流或电路两端电压的重要电学仪器,在电学实验中正确选取滑动变阻器既要有理论知识又要有实践经验,是学生应该掌握的基本技能,也是教学中的难点,下面谈谈滑动变阻器在实验中作用及如何选择滑动变阻器.一、总的原则涉及滑动变阻器“作用和选择”问题的电学实验主要有:探究通过导体的电流与导体两端的电压和导体的电阻的关系、探究电磁铁磁性强弱跟电流大小关系、伏安法测电阻、伏安法
Slide rheostat by changing its resistance to change the current in the circuit or circuit voltage across the important electrical instruments in the electrical experiment correctly selected sliding rheostat have both theoretical knowledge and practical experience, students should master the basic skills, Is also a difficult teaching, the following talk about the role of sliding rheostat in the experiment and how to choose sliding rheostat.One, the general principle Involving the sliding rheostat “role and choice ” problem of electrical experiments are: to explore through the conductor current and conductor The voltage between the two ends and the relationship between the resistance of the conductor, to explore the magnetic strength of the magnet with the current size relationship between voltammetry resistance, voltammetry