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伏安法测电阻是电阻测量的最基本方法,而其中的仪器和电路选择问题则是重点和难点,也是同学们在学习过程中困惑比较多的地方。它一般要求学生根据题目提出的要求和给出的器材,设计出实验方案。实验电路一般分为电源、控制电路和测量电路三部分,如图1所示。其中控制电路的核心元件为滑动变阻器,它的作用是保证测量电路的电流和电压在一个合适的范围内变化,它在电路中有两种接法:限流式接法和分压式接法。测量电路中除被测元件外,
Voltammetry resistance measurement is the most basic method of resistance measurement, of which the instrument and circuit selection problems are the key and difficult, but also students in the learning process more confusion. It generally requires students to design experimental programs based on the questions asked and the equipment given. Experimental circuit is generally divided into power supply, control circuit and measurement circuit in three parts, shown in Figure 1. One of the core components of the control circuit for the sliding rheostat, its role is to ensure that the measurement of current and voltage circuits in a suitable range of changes, it has two kinds of connections in the circuit: current-limiting and voltage-sharing connection . In addition to the measured circuit measurement components,