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物理知识来源于实践,特别是来源于观察和实验,物理实验也是高考所要求的内容,因此实验教学就显得非常重要。然而教材中的内容比较简单,这就需要教学中不断的对知识进行拓展和延伸。比如:用电流表和电压表测电池的电动势和内阻的实验中,教材只给出了一种实验电路,即电流表外接电路(相对电源)。但在练习和考试中学生会遇到另外一种测量电路,即电流表内接
Physical knowledge comes from practice, especially from observations and experiments. Physical experiments are also required by entrance exams. Therefore, experimental teaching is very important. However, the contents of the textbook is relatively simple, which requires continuous expansion and extension of knowledge in teaching. For example: Ammeter and voltmeter with the battery electromotive force and resistance of the experiment, the text only shows an experimental circuit, the ammeter external circuit (relative power). However, in practice and exam students will encounter another kind of measurement circuit, that is, ammeter inscribed