2022 英语周报 高二 外研 7答案

14.参考答案(1)20.0(1分)1.5(1分)(2)电流计内阻未知(2分(4)30(2分)3(2分)说明分析(1)电流计的最小有效分度值为1mA,经估读后示数为20.0mA。由欧姆定律得E=I( Rg R),则有E=30×10-3×(r R8 17a),E=20×103×(r R8 429),解两式得(2)在上面的计算中可以求出r R。由于不知道电流计内阻Rn,所以无法求出电源内阻(4)结合题图丙所示的电路图,由电路规律得E=I(Rk B) I(R RnR r,整理1-最 Ro由题图了的号一图像可计算截距为b一 士2-2A,率为上2-2Aa3120A-/g-1,解得r=39,R=30a

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