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变阻器在电学实验中有着广泛的应用,大多有关电的设备或器材中都有变阻器的身影.变阻器作为高频考点,考题围绕其工作原理、使用方法、判断电阻变化情况等知识点进行考查.一、变阻器的原理在电路两端电压不变的情况下,要改变电路中的电流,只需要改变接入电路中的电阻.改变导体的材料、长度、横截面积和温度都能够达到改变电阻的目的,而改变长度是最简便的方法,如图1所示.图1变阻器就是通过改变接入电路中电阻丝的长度
Rheostat has a wide range of applications in electrical experiments, most of the electrical equipment or equipment has rheostat figure.Water rheostat as a high frequency test center, test questions around its working principle, the use of methods to determine the resistance changes and other knowledge points to examine. , The principle of the rheostat in the case of constant voltage across the circuit, to change the current in the circuit, only need to change the resistance of the access circuit.Change the conductor material, length, cross-sectional area and temperature can reach the resistance Purpose, and change the length is the easiest way, shown in Figure 1. Figure 1 varistor is by changing the resistance of the access circuit wire length