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欧姆表的零刻度为什么在右边

更新时间: 2020-09-24 00:00:00     

零刻度在右边的是“串联式”欧姆表,它是由电流表改装的。工作时电源、表头、待测电阻是串联的,待测电阻越小,电路中电流越大,待测电阻等于零时,电流最大,这时电流表的指针将指在最右边。当表笔断开时表示电阻无穷大,此时电流为零指针在刻度最左边。

关键词: 欧姆 刻度 为什么 右边

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