纵观近年来的高考实验,电学设计性实验是常考内容.试题常常是推陈出新、与时俱进,情境新、变化多.要求考生灵活地应用等效思维把学过的知识、做过的实验,进行迁移和重组,主要考查学生应变和创新能力.下面谈谈实际电流表、电压表、电源的等效及其应用.一、电流表的等效实际电流表有一定的内阻,它等效于一理想电流表串联一较小的电阻,所以实际电流表的本质是能显示通过其电流的一个较小电阻,不超过它的量程时,它在电路中既可以串联也可以并联,串联可测电流, Throughout the college entrance examination experiments in recent years, electrical design experiments are often test content. Test questions are often new, advancing with the times, new situations, changes and more. Experiment, carry out the relocation and reorganization, mainly to examine the student strain and innovation ability.The following talk about the actual ammeter, voltmeter, power supply equivalent and its application.A, the ammeter’s equivalent actual ammeter has a certain internal resistance, which is equivalent to An ideal ammeter in series with a smaller resistance, so the essence of the actual ammeter can display a small resistance through its current, does not exceed its range, it can be in the circuit can be connected in series or parallel, the measured current in series,