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电学实验是整个高中物理实验中的重点,又是难点,也是历年高考实验考查的热点。在电学实验中包含众多的选择:仪表的选择、测量电路的选择、控制电路的选择等。本文试对这些选择作一小结,以期能对物理的教与学提供参考作用。一、测量仪表的选择1.电流表、电压表的选择电流表、电压表的选择原则可用两句话三个字概括。第一句话就一个字:准。准的意思就是要确保仪表测量的数值相对误差要小,而要减小测量的相对误差,就必须确保仪表测量时指针偏转角较大,在不超过量程的情况下,越接近满偏相对误差越小。故“准”
Electrical experiment is the focus of the entire high school physics experiment, but also difficult, but also calendar years of college entrance examination test hot spots. There are numerous options in electrical experiments: instrument selection, measurement circuit selection, control circuit selection and more. This paper tries to make a summary of these choices in order to provide reference for teaching and learning physics. First, the choice of measuring instruments 1 ammeter, voltmeter selection ammeter, voltmeter selection principle can be summarized in two words three words. The first sentence of a word: accurate. The meaning of the quasi is to ensure that the relative error of the measured value of the instrument is smaller, and to reduce the relative error of the measurement, it is necessary to ensure that the pointer deflection angle is larger when the instrument is measuring, and closer to the full-scale relative error without exceeding the measuring range The smaller. Therefore “quasi”