(1)在测定一根粗细均匀合金丝电阻率的实验中,利用螺旋测微器

1)在测定一根粗细均匀合金丝电阻率的实验中,利用螺旋测微器测定合金丝直径的过程如图所示,校零时的读数为________ mm,合金丝的直径为_______mm

2)为了精确测量合金丝的电阻R­­­x,设计出如图Ⅰ所示的实验电路图,按照该电路图完成图2中的实物电路连接。

Ⅲ。(7分)根据闭合电路欧姆定律,用图Ⅰ所示电路可以测定电池的电动势和内电阻。图中0两端的对应电压U12,对所得的实验数据进行处理,就可以实现测量目的。根据实验数据在坐标系中描出坐标点,如图2所示。已知,请完成以下数据分析和处理。(1)图2中电阻为      的数据点应剔除;

2)在坐标纸上画出关系图线;

3)图线的斜率是        ,由此可得电池电动势          

答案

0.007    0.640  80    倾斜直线(图略)0.0043   1.56

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