电阻是初中物理学中一个很重要的物理量,它的大小主要受导体的材料、长度、截面积、温度等因素的影响。学生分析断了的电阻丝的电阻变化这种问题时,常不会分析,或分析错。笔者就这种实际问题通过例题分析进行了探讨,以便帮助学生理解并掌握其分析方法。 Resistance is a very important physics in junior middle school physics, its size is mainly affected by the conductor material, length, cross-sectional area, temperature and other factors. Student analysis of the resistance of the resistance wire changes such problems, often not analyze, or analysis of the wrong. The author discusses this practical problem through the example analysis in order to help students understand and master their analytical methods.