在伏安法测量小灯泡的电阻和功率时,定值电阻有重要应用,它可以起到一只伏特表或安培表的作用,并能运用到大量的电学知识。在教学中,要引导学生拓宽思路,全面理解伏安法测量的意义,在掌握原理的基础上,摆脱束缚,大胆设计,提高他们分析和解决问题的能力,在理论和实践的结合上学好物理学。 When measuring the resistance and power of a small bulb in voltammetry, the set point resistor has an important application. It can function as a voltmeter or an ammeter and can use a large amount of electrical knowledge. In teaching, to guide students to broaden their thinking, a comprehensive understanding of volt-ampere measurement significance, based on the principle, get rid of the shackles, bold design, improve their ability to analyze and solve problems, the combination of theory and practice to learn physics .