题目内容

小刚和小红同学在测量小灯泡的电阻时,记录了下面的数据:计算出每次实验的电阻,比较这些电阻你能发现什么?尝试着对你的发现作出解释.

实验次数

I/A

U/V

R

1

05

6           

 

2

048

65

 

3

044

5           

 

4

04

45

 

5

036

4           

 

 

答案:
解析:

实验次数                      I/A                               U/V                                    R/Ω

1                                  05                             6                                    12

2                                  048                           65                                    13.5

3                                  044                           5                                    11.4

4                                  04                             45                                    11.2

5                                  036                           4                                    11.1

随着电压的升高,灯丝的电阻增大.

 


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