如图甲所示是“测定小灯泡电功率”实验的装置图,电源电压为4v且保持不变,小灯泡额定电压为25v,阻值约为9Ω,�动变阻器标有“20Ω 1a”字样。 Template


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tomski如图甲所示是“测定小灯泡电功率”实验的装置图,电源电压为4v且保持不变,小灯泡额定电压为25v,阻值约为9Ω,�动变阻器标有“20Ω 1a”字样。 coloring