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物理是一门以观察和实验为基础的科学。演示实验是增加学生学习兴趣、提高课堂教学质量的一种主要渠道和有效手段。设计好演示实验,是物理教师应有的素质,也是当前物理教学改革的重要课题。结合多年的教学经验,笔者认为设计一个好的物理演示实验应遵循以下原则。一、科学性要强演示实验重现的物理现象要力求真实、正确、符合科学。例如,用大型示教用电流计演示LC 振荡电路产生振荡电流时,看到电流计指针来回摆动,于是就解释说振荡回路产生了振荡电流,这是不科学的。因为在一般情况下 LC 回路振荡频率很高,电流计指针根本来不及摆动,指
Physics is a science based on observation and experimentation. Demonstration experiment is a main channel and effective means to increase students’ interest in learning and improve the quality of classroom teaching. Designing demonstration experiments is the quality that physics teachers should have, and it is also an important issue in current physics teaching reform. Combined with years of teaching experience, the author believes that designing a good physical demonstration experiment should follow the following principles. First, the scientific nature must demonstrate that the physical phenomena reappeared in the experiment must be true, correct, and scientific. For example, when a large teaching current meter is used to demonstrate that the LC oscillation circuit generates an oscillating current, the current meter pointer is seen to oscillate back and forth, so that it is explained that the oscillating circuit generates an oscillating current, which is unscientific. Because in the general case the LC circuit oscillates at a high frequency, the current meter pointer simply does not have time to swing.