【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
为了测定一节干电池的电动势和内阻,在实验中备有下列器材:A.待测干电池(电动势约为1.5V,内电阻小于1.0Ω)B.电流表A1(0~0.6A,内阻约0.1Ω)C.电流表A2(0~3A,内阻约0.05Ω)D.滑动变阻器R1(0~20Ω,10A) E.滑动变阻器R2(0~100Ω,1A)F.电流表G(满偏电流3mA,内阻RG=10Ω) G定值电阻R3=990Ω H、开关,导线若干(1)为测量方便、准确,应选用的器材有_________。 (2)请利用本题所提供的器材,画出你设计的实验电路图。 (3)图为某一同学根据他所设计的实验绘出的I1--I2图线(I1为电流表G的示数,I2为电流表A的示数),由图线可求得被测电池的电动势E= ______V,内电阻为r=______ Ω。
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