如图甲所示,定值电阻
,闭合开关S,改变电阻箱R阻值,得到多组R、I值,并作出了如图乙所示的
图线,则( )
![](https://img.xkw.com/dksih/QBM/2021/11/21/2855965947650048/2856921407193088/STEM/9d0bd8c4-376f-4217-95db-c14544aa3752.png?resizew=363)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ce77a7d8120a8cd7bcbc274ac89f4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3ab5dd241cc47a03bf539857c48790.png)
![](https://img.xkw.com/dksih/QBM/2021/11/21/2855965947650048/2856921407193088/STEM/9d0bd8c4-376f-4217-95db-c14544aa3752.png?resizew=363)
A.电源电动势为5.0V |
B.电源内阻为2.5Ω |
C.从系统误差角度看,利用该装置测得的电动势大于其真实值 |
D.从系统误差角度看,利用该装置测得的内阻大于其真实值 |
更新时间:2021-11-22 19:24:23
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【知识点】 用电流表和电阻箱测量电源的电动势和内阻