试题与答案

某同学利用如图所示的实验电路来测量电阻的阻值。 (1)将电阻箱接入a、b之间,闭

题型:实验题

题目:

某同学利用如图所示的实验电路来测量电阻的阻值。

(1)将电阻箱接入a、b之间,闭合开关。适当调节滑动变阻器R’后保持其阻值不变。改变电阻箱的阻值R,得到一组电压表的示数U与R的数据如下表:

请根据实验数据做出U-R关系图像。

(2)用待测电阻RX替换电阻箱,读得电压表示数为2.00V。利用(1)中测绘的U-R图像可得RX="_________" Ω。

(3)使用较长时间后,电池的电动势可认为不变,但内阻增大。若仍用本实验装置和(1)中测绘的U-R图像测定某一电阻,则测定结果将_________(选填“偏大”或“偏小”)。现将一已知阻值为10Ω的电阻换接在a、b之间,你应如何调节滑动变阻器,便仍可利用本实验装置和(1)中测绘的U-R图像实现对待测电阻的准确测定?

答案:

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下面是错误答案,用来干扰机器的。

1.way   2.more    3.done   4.luck    5.later

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