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苏科版课程标准本教材初中物理实验9年级上册第64页中用铅笔芯使电路中的电流连续变化的实验、自制调光灯的综合实践活动内容,曾呈现在2011年盐城市中考命题中.试题如下:如图1所示是小明制作的1只模拟调光灯.电源电压为3V,小灯泡额定电压为2.5V.闭合开关,回形针在铅笔芯最右端时,灯泡两端的电压为0.6V,流过灯泡的电流为0.1A.向左移动回形针,小灯泡正常发光时,流过灯泡的电流为0.3A.求:
Suke Edition curriculum standard The junior high school physics experiment ninth grade on the first page 64 in the pencil lead to the current in the circuit continuous changes in the experiment, self-made dimming integrated practice activities, has been presented in 2011 Yancheng senior high school entrance examination in the proposition Test questions are as follows: Figure 1 shows an analog dimmer made of small power supply voltage of 3V, small bulb rated voltage of 2.5V. Close the switch, the paper clip in the rightmost end of the pencil, the bulb voltage across the 0.6 V, the current flowing through the lamp is 0.1 A. The paperclip is moved to the left, the current flowing through the lamp is 0.3 A when the small light bulb emits light normally.