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题目:给定干电池一节、开关两个、电压表一只、定阻电阻一个(已知其阻值)、导线若干,试设计一个电路图,使其按一定步骤测定一个未知电阻的阻值,〈只作图〉 (1996,湖南省) 这是一道设计性实验题,主要考查学生灵活运用所学知识解决实际问题的能力,考生一般只能设计出一种(第一种电路图),笔者认为本题没有指出是单刀单掷开关或是单刀双掷开关,故可设计出如下四种电路图。
Title: Given a dry cell section, two switches, a voltmeter, a fixed resistance (known resistance), and a number of wires, try to design a circuit diagram to determine the resistance of an unknown resistor according to certain steps. “Only for Mapping” (1996, Hunan Province) This is a design experiment, which mainly examines students’ ability to flexibly apply the knowledge they have learned to solve practical problems. Candidates generally can only design one (the first kind of circuit diagram). This question does not indicate whether it is a single-pole single-throw switch or a single-pole double-throw switch. Therefore, the following four circuit diagrams can be designed.