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不久前,我们组织部分初中物理教师赴外地某校学习,听了一节初三物理公开课,课题是“测 R_x 的实验设计”。在简要复习伏安法测电阻的原理和串并联电路特点后,教师提出问题:如何利用现有器材来测定未知电阻 R_x 的阻值?要求:(1)画出电路图;(2)拟定实验步
Not long ago, we organized some junior high school physics teachers to go to a foreign school to study and listened to a third-day physical open class. The topic was “experimental design of R_x”. After briefly reviewing the principle of series resistance measurement using the volt-ampere method and the characteristics of series-parallel circuits, the teacher asked the question: How to use existing equipment to determine the resistance of unknown resistor R_x? Requirements: (1) Draw a circuit diagram; (2) Formulate an experimental step