试题与答案

在研究电流与电压、电阻的关系时,同学们设计了图中甲所示的电路图,其中R为定值电阻

题型:实验题

题目:

在研究电流与电压、电阻的关系时,同学们设计了图中甲所示的电路图,其中R为定值电阻,

R′为滑动变阻器。试验后,数据记录在表1和表2中。

(1)由于电路中电流的大小受多种因素影响,所以我们在探究某一因素变化对电流的影响时,采用了           法。

(2)根据甲电路图,用笔画线代替导线连接图乙所示的实物。

(3)根据表中实验数据,可得出如下结论:

a.由表1可得:                                                

b.由表2可得:                                                

(4)在研究电流与电阻的关系时,先用5Ω的定值电阻进行实验,使电压表的示数为3V,再换用10Ω的定值电阻时,某同学改变滑动变阻器滑片的位置,合上开关后,电压表的示数将      3V(填“大于”或“小于”或“等于”)。此时应向     (填“左”或“右”)调节滑片使电压表示数仍为3V。

答案:

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