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一、电源的规格例1 聪聪同学做“测定小灯泡的电功率”实验时,所用的电源电压为6V,小灯泡的额定电压为3.8V.实验时,聪聪同学发现实验所用的电压表0-15V量程挡坏了,而0-3V量程挡完好, 在不更换实验器材的条件下,聪聪同学想了一个巧妙的办法测出了小灯泡的电功率.请画出聪聪同学重新设计的实验电路图,并简要说明判断小灯泡是否正常发光的方法和理由.
First, the power supply specification example 1 Congcong students do “measure the power of small light bulbs” experiment, the power supply voltage used is 6V, the rated voltage of the small light bulb is 3.8V. During the experiment, Congcong found that the 0-15V range of the voltmeter used in the experiment was blocked, and the 0-3V range was in good condition. Without changing the experimental equipment, Congcong thought about a clever way to measure the small The electric power of the bulb. Please draw the experimental circuit diagram redesigned by Congcong students, and briefly explain the method and reason for judging whether the light bulb emits light normally.