2021-2022高一北师大版英语周报答案

23.(1)C(1分)E(1分)(2)图线见解析(1分)148(2分)0.51(2分)(3)BD(2分)解:(1)干电池的电动势为1.5V,故电压表应选C,电流表应选E(2)-图线如图所示,纵轴截距表示电动势,E=148V,图线斜率的绝对值表示内阻,则r=+48710=051a4U/V0=1.51.31.200.200.400.60(3)在测量电源的电动势和内阻时,电压表测量电源的外电压准确,电流表测量通过电源的电流偏小,因为电压表起分流作用,作出U-I图线实际图线和测量图线如图所示,知电动势的测量值偏小,内电阻的测量值偏小.故A、C错误B、D正确实际图线测量图线

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