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> 要测量一块多用电表直流10mA档的内阻R A（约40Ω）。除此多用电表外，还有下列器材：直流电源一个（电动势E约为1.5V，内阻可忽略不计），电阻一个（阻值R约为150Ω），电键一个，导线若干。要求（1）写出实验步骤；（2）给出R A的表达式。

问题：

发布时间：2024-09-08

要测量一块多用电表直流10mA档的内阻R _A（约40Ω）。除此多用电表外，还有下列器材：直流电源一个（电动势E约为1.5V，内阻可忽略不计），电阻一个（阻值R约为150Ω），电键一个，导线若干。要求
（1）写出实验步骤；
（2）给出R _A的表达式。

参考答案：

提问用户：GH***qkI

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