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下面是我区统一考试一道探究性实验题:有一只改装后的电表,可能是电压表(量程为0～0.5V),也有可能是电流表(量程为0～0.5A).老师在科技活动室为你准备有下列器材:两节干电池组成的电源,两只指示灯(规格为0.6V、12mA)一只滑动变阻器(阻值为0～200Ω),一只开关及足够的导线.要求用这些器材探究该电表是电压表还是电流表,请你(1)设计探究实验电路图;(2)写出主要的操作步骤;(3)根据实验现象,如何作出判断.
The following is an inquisitive experiment question in our district’s unified examination: There is a modified meter, which may be a voltmeter (ranging from 0 to 0.5V) or an ammeter (ranging from 0 to 0.5A). The teacher is in the science and technology activity room. Prepare the following equipment for you: two sections of dry battery power supply, two indicators (0.6V, 12mA), one sliding rheostat (resistance from 0 to 200Ω), one switch, and enough wires. These are required. The equipment explores whether the meter is a voltmeter or an ammeter. Please (1) design and explore the experimental circuit diagram; (2) write out the main operation steps; (3) how to make judgments based on the experimental phenomenon.