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磁性开关Cs1一u电压是多少伏

磁性开关Cs1一u电压是多少伏

2025-03-31 05:10:09

推荐回答（1个）

回答1：

1）开关S1闭合，S2断开时，R1和R2串联，串联等流分压，即I1=I2=I，U1+U2=U,，电压表测R1两端的电压U1,电流表测电路的电流I

串联电路的总电阻R=R1+R2=10欧+20欧=30欧

电路的电流I=U/R=9v/30欧=0.3A

R1两端的电压U1=IR1=0.3A*10欧=3v

则此时电流表的示数为0.3A，电压表的示数为3v

2)开关S1和S2都闭合时，R1被短路，R2单独通路，此时R1两端的电压即电压表的示数为0

电流表的示数为I=U/R2=9v/20欧=0.45A

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