2022届湖南金太阳高三2月联考(22-12-291C)语文答案

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13.(1)BEF(3分)(2)电路图如图所示(3分)(3)R2_或U1一,其中U1、U2分别为电压表V1、V2的读数,R1是电阻箱读数(3分)【解析】(1)测电阻的基本方法是伏安法,待测电压表V1所能通过的最大电流约为0.5mA,电流表A的量程太大不能选用;因电压表V2的内阻已知,可作为电流表使用,其能通过的最大电流为1mA,待测电压表V1允许通过的最大电流约为0.5mA,若两电压表串联后进行实验,不能保证指针偏转均超过其量程的一半;若用电阻箱R1与待測电压表V1并联后再与电压表V2串联,当电阻箱R1阻值与待测电压表V1内阻差不多时,可保证指针偏转均能超过其量程的一半。因电压表内阻远大于两滑动变超过其量程的一半。因电压表内阻远大于两滑动变阻器阻值,滑动变阻器应采用分压接法,为调节方便应选择阻值较小的R2;为完成实验,除待测电压表V1、电源、开关S和导线外,还需要电压表V2、滑动变阻器R2和电阻箱R1。(2)由(1)可知电路图如图所示。(3)实验中某次电压表V1、V2的读数分别为U1、U2,ry是电压表V2的内阻,R1是电阻箱R1的读数根据欧姆定律得R=U2_U°RI

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!