大学物理电表改装与校正实验。是否还有别的办法来测定电流计的内阻?能否用欧姆定律来进行测定?

能否用电桥来进行测定而又保证通过电流机电电流不超过Ig?
2025-03-14 20:38:27
推荐回答(2个)
回答(1):

可以。

测定电流计的内阻时,只是把电流计当成电阻即可。

凡是测电阻的方法,都可以用来测电流计的内阻,不同的是,要保证通过电流计电流不超过Ig,以免损坏电流计。

当然,可以用电桥来测定。把电流计作为电桥的一个臂。怎么保证通过电流计的电流不超过Ig,只要在电源上加一个调压电路,控制电源的电压即可。

扩展资料:

电阻元件的电阻值大小一般与温度,材料,长度,还有横截面积有关,衡量电阻受温度影响大小的物理量是温度系数,其定义为温度每升高1℃时电阻值发生变化的百分数。电阻的主要物理特征是变电能为热能,也可说它是一个耗能元件,电流经过它就产生内能。电阻在电路中通常起分压、分流的作用。对信号来说,交流与直流信号都可以通过电阻。

参考资料来源:百度百科-电阻器

回答(2):

测定电流计的内阻时,只是把电流计当成电阻即可。所以,凡是测电阻的方法,都可以用来测电流计的内阻,不同的是,要保证通过电流计电流不超过Ig,以免损坏电流计。当然,可以用电桥来测定。把电流计作为电桥的一个臂。怎么保证通过电流计的电流不超过Ig?只要在电源上加一个调压电路,控制电源的电压即可。

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