在人教版高二物理课本中实验《描绘小灯泡的伏安特性曲线》时,课本上的电路图采用分压式而不采用限流式,通过一番分析和实验观察,觉得应该是分压式电路中电流随电阻的变化量大于限流式,以下是推导过程.一、利用微分法来确定两种电路的电流变化1.分压式电路中电流 In the PEP Physics textbook experiment “depicting the volt-ampere characteristic curve of small bulbs”, the text on the circuit diagram using partial pressure instead of the current-limiting, through some analysis and experimental observation, that should be partial pressure Current in the circuit with the resistance change is greater than the current limit, the following is the derivation process. First, the use of differential method to determine the current changes in two circuits 1. Voltage divider circuit current