电阻在电路中通常起分压、限流的作用,电表的改装需串联或并联电阻来达到实验要求,本文通过实例,深入剖析定值电阻在电学实验中的应用. Resistance in the circuit usually from the partial pressure, the role of current limiting, the meter should be modified in series or parallel resistance to meet the experimental requirements, this article through examples, in-depth analysis of the value of resistance in electrical experiments.