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如何测电流表的内阻
更新时间: 2020-09-24 00:00:00  

用半偏法测量:先调节外电阻R使其阻值最大,然后闭合外电路的开关S1,调整R使电流表的指针偏转到满刻度,再闭合内开关S2,此时流过电流表的电流将变小,调整R1,R1与电流表并联后与R串联,使电流表的指针正好是满刻度的一半,而另一半电流通过R1,根据并联电路的特点可知,电流表的内阻r等于R1。

关键词: 如何 电流表 内阻

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