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伏安法是测电阻阻值的一种常用方法,通常分为电流表内接法和电流表外接法两种电路,在实验教材中一般是给出两个阻值不同的待测电阻(一个约几百欧以上,另一个约几十欧)让学生对每个待测电阻分别用两种接法进行测试,从而验证内接法和外接法的适用范围,按照教材所给实验步骤,缺乏设计创新能力的培养.但大多数学生能在较短的时间内成功完成上述实验,实验做完了尚有空闲时间.同学们感到意犹未尽,显得教学内容不饱满。
Volt-ampere is a common method of measuring the resistance of a resistor. It is usually divided into two types: in-meter in-connection and ammeter external method. In the experiment textbook, two resistances with different resistances are usually given. More than 100 ohms and another tens of tens of eurs allow students to test each resistance to be tested using two connections respectively, thereby verifying the scope of application of in-line and external methods, and lack of design innovation according to the experimental procedures given in the teaching materials. Ability to develop. However, most students can successfully complete the above-mentioned experiment in a relatively short period of time. There is still free time for the students to finish the experiment. The students feel that they are still full of meaning and the teaching content is not full.