2022-2022年英语周报九年级外研答案

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18.BD【解析】由变压器的规律n1l1=n2l2及I21,可知n1:n2=2:1,A错误;由,,=一,可得UU1=24V,B正确;Ua=U1+U1=36V,此为有效值,则输入电压的最大值为36√2V,C错误;三盏灯泡的总功率为18W,等效电阻R=Pa=72n,D正确。

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