铅笔是学生在学习过程中使用频率极高的学习用品,利用它能做许多物理实验。铅笔的笔芯主要由石墨和黏土构成,笔芯导电性强弱主要取决于笔芯中石墨含量的高低。通常来说,笔芯越质软,则石墨含量越高,导电性越强。6H到6B的铅笔,其导电性逐步增强。此外,导体的导电性一般随温度的升高而降低。为了更好地教学,笔者利用铅笔制作了一些简易模型用于课堂教学,收到了较好的教学效果。下面,笔者 Pencil is a high frequency of learning materials used by students in the learning process, use it to do many physical experiments. Pencil refill is mainly composed of graphite and clay, pen refill mainly depends on the level of graphite content in the refill. In general, the more soft refill, the higher the graphite content, the more conductive. 6H to 6B pencil, its conductivity is gradually enhanced. In addition, the conductivity of the conductor generally decreases with increasing temperature. In order to better teach, I made some simple models using pencil for classroom teaching, received a good teaching effect. Below, the author