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人教版高中物理第二册(试验修订本.必修加选修)第193页研究电感对交变电流的阻碍作用,电路如图1,利用双刀双掷开关S分别接到直流电源和交流电源上,实验中要求取直流电压和交流电压的有效值相等。当开关S接到直流时,灯泡亮些;当接到交流电源时,灯泡暗些,就表明电感对交变电流有
PEP High School Physics Book 2 (Experimental Revisions. Compulsory and Optional) Page 193 Study the hindrance of the inductance to alternating currents. The circuit is shown in Figure 1. The DC double-pole double-throw switch S is connected to the DC power supply and the AC power supply respectively. In the experiment, it is required to take the effective value of DC voltage and AC voltage equal. When the switch S is connected to DC, the light bulb is brighter; when the AC power is received, the light bulb is dark, indicating that the inductor has alternating current.