滑动变阻器是通过改变其阻值来改变电路中的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,下面谈谈我们在实验中是如何选择滑动变阻器的。 The sliding rheostat is an important electrical instrument that changes the current in the circuit or the voltage across the circuit by changing its resistance value. In the electrical experiment, the correct selection of the sliding rheostat requires both theoretical knowledge and practical experience. It is the basic knowledge that students should master. Skills are also difficult in teaching. Let’s talk about how we chose sliding rheostats in our experiments.