英语周报2018-2022学年8年级上册答案

18.【答案】C解析】a、b两端接入的交变电压的有效值为36V,电压表的示数等于接入的交变电压的有效值减去灯泡1两端的有效值(C=12V),即1=24V,A项错误由变压器的匝数比n;n2=1:22A.,n=”21、=下D=0.5A,可得刷线图输出电压U2=48V,2=0.25A,电阻箱两Pc6端电压为36V、流过它的电流为0.25A,根据串联电路知识可知,电阻箱阻值为1442.B项错误12的额定功率P=13×0.25W=3.W.C项正确;:增大电阻箱的阻值;原线圈中的电流减小灯泡L调端电压减小,、两端接入的交变电压的有效值不变、所以电压表示数增大、D项错误答案lACD

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!

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