“欧姆表改装”是以闭合电路欧姆定律为基础的,在这部分“Ⅱ级”内容的教学中,教师往往会发现,相比电流表和电压表的改装,学生对多量程欧姆表的改装及运用存在更大困难,尤其是对如何实现多量程欧姆表的设计,欧姆表在更换量程后为什么必须重新调零,怎样实现调零等问题疑惑甚多.下面笔者对这些需要讲清的问题作具体阐述,盼与同行共探讨. “Ohmmeter modification ” is based on the closed circuit Ohm’s law, in this part “II ” content of teaching, teachers tend to find that, compared to ammeter and voltmeter modification, students on the multi-range ohm Table modification and the use of more difficult, especially on how to achieve multi-range ohmmeter design, ohm meter in the range of why the need to re-zero after zero, how to achieve zero and other issues puzzled. Clearly elaborated on the issue, hope and colleagues to discuss.