物理是一门以实验为基础的学科,尽量多做且做好各个演示实验,不但有利于课堂教学中难点的突破,使学生看得懂、记得牢,而且更是培养学生创新精神提高实践能力的有效手段.但有些实验苦于难觅有效器材,往往想做也做不成.例如必须要有强电流的演示实验,在普通中学物理实验室的条件? Physics is an experiment-based discipline. Trying to do as much as possible and do a good job of each demonstration experiment is not only helpful to the difficulties in classroom teaching, it helps students to understand and remember, but also to cultivate students’ innovative spirit and improve their practical ability. The effective means. But some experiments suffer from difficult and effective equipment, often want to do and do not succeed. For example, must there be strong current demonstration experiments in the conditions of ordinary secondary school physics labs?