初中物理“电阻”一节中指出:金属的电阻随温度的升高而增大;高中物理“电阻定律”一节中又提出:各种材料的电阻率随温度变化,金属的电阻率随温度的升高而增大。在教学中直观地将上述结论用实验演示出来,能加深学生对这一知识的理解,增强学习效果,培养学生科学探究物理现象与知识的能力。 Middle School Physics “resistance” section states: metal resistance increases with temperature; high school physics “resistance law ” section also proposed: the resistivity of various materials with temperature changes, the metal The resistivity increases with increasing temperature. In the teaching of intuitively the above conclusions experimentally demonstrated, to deepen students ’understanding of this knowledge, enhance learning effectiveness, and develop students’ ability to scientifically explore physical phenomena and knowledge.