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欧姆表是使用方便、用途广泛的电测仪表。既可用来粗测电阻,查找电道的通断故障;又可用以判断晶体管、电路的优劣和估测晶体三极管的放大系数等,是电工和物理实验室不可缺少的工具性仪表。在历年高考中,欧姆表的应用试题曾多次出现过。欧姆表在教学中应占有一定地位。笔者在教学中运用系列习题教学法进行欧姆表的教学,效果较好,具体做法如下: 一、导入新课例1、如图1所示电路,已知(?)=1.5伏,电流表G的满偏电流I_g=10OμA,调节可变电阻R,使电流表电流满偏。试求:
Ohmmeters are easy-to-use, versatile electrical meters. It can be used to roughly measure the resistance and find the on/off failure of the electric channel; it can also be used to judge the advantages and disadvantages of the transistor and the circuit and estimate the amplification coefficient of the transistor, etc. It is an indispensable instrumental instrument for electricians and physics labs. In the college entrance examination over the years, ohmmeter’s application questions have appeared many times. Ohmmeter should occupy a certain position in teaching. The author uses a series of exercises to teach Ohmmeter teaching in teaching, the effect is good, the specific approach is as follows: First, the introduction of new lesson 1, shown in Figure 1 circuit, known (?) = 1.5 volts, ammeter G The full bias current I_g=10OμA adjusts the variable resistance R to make the ammeter current full. Try to find: