“电表改装”类试题在近几年各地中考试卷中频频出现,目的是:一方面考查学生综合应用所学物理知识的能力,另一方面拉近物理与日常实际的距离,体现“从生活走向物理”的新课改理念.1.将电流表(或电压表)改装成电压表(或电流表)例1(安徽中考题)常用的电压表是由小量程的电流表G改装而成的.电流表G也是一个电阻,同样遵从欧姆定律.图1甲是一个量程为0~3 mA的电流表G,当有电流通过时,电流 In recent years, the examination papers frequently appear all over the country, the purpose is: on the one hand examine the ability of students to apply the physics knowledge, on the other hand to narrow the distance between physical and daily reality, to reflect the “ From life to physics ”new curriculum reform concept .1. The ammeter (or voltmeter) into voltmeter (or ammeter) Example 1 (Anhui test questions) commonly used voltmeter is a small range of ammeter modified from G . Ammeter G is also a resistor, also follow Ohm’s law. Figure 1 A is a current range of 0 ~ 3 mA ammeter G, when the current through, the current