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在“用多用电表测电阻”的实验教学中,我发现:无论教师在实验教学中,还是在各类参考资料、考题中,都未涉及到机械调零。时间一长,这个实验步骤在中学物理中几乎被遗忘了。甚至有的教师还明确告诉学生:没有必要进行机械调零。那么,用多用电表测电阻时,是不是可以不进行机械调零呢?
In the experimental teaching of “using multimeters to measure resistance”, I found that no matter whether the teacher is in experimental teaching or in various reference materials and exam questions, no mechanical zero adjustment is involved. Over time, this experimental step was almost forgotten in the middle school physics. Some teachers even explicitly told students that there is no need for mechanical zeroing. Then, when using a multimeter to measure the resistance, can it not be mechanical zero?