浦东新区1999年上半年初三物理中考模拟考试卷中有一道实验题:某位学生连接电路后,闭合电键,移动滑动变阻器,发现当电压表示数变大时,电流表示数变小,电灯变暗;当电压表示数变小时,电流表示数变大,电灯变亮。当他将滑片移 Pudong New Area in the first half of 1999, the first three physical exam simulation exam volume in a test question: a student connected to the circuit, the closure of the keys, sliding rheostat and found that when the number of voltage becomes larger, the number of current becomes smaller, Dark; when the voltage indicates a smaller number, the current indicates a larger number, the light brighter. When he slides