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【題目】某同學(xué)設(shè)計了一個路燈自動控制門電路,如圖所示,天黑了,讓路燈自動接通,天亮了,讓路燈自動熄滅。圖中RG是一個光敏電阻,當(dāng)有光照射時,光敏電阻的阻值會顯著地減小,R是可調(diào)電阻,起分壓作用。J為路燈總開關(guān)——控制繼電器圖中未畫路燈電路。關(guān)于此電路,下列說法正確的是()

A天黑時,RG增大,A為高電位,Z為低電位,J使路燈亮

B天黑時,RG增大,A為低電位,Z為高電位,J使路燈亮

CR調(diào)大時,傍晚路燈亮得早一些

DR調(diào)大時,傍晚路燈亮得晚一些

【答案】BD

【解析】當(dāng)光照變?nèi)鯐r光敏電阻RG的阻值變大,分擔(dān)的電壓大,則門電路獲得的電勢低,非門電路輸入端電壓變小,繼電器得到的電壓變高,路燈被點亮,所以B對,A錯;在相同的光照情況下,若電阻R增大,使得R的分得電壓變大,使非門電路的輸入端電壓變大,繼電器得到的電壓偏低,路燈不被點亮。只有天氣更暗時,更晚一些,天色更暗時,光敏電阻更大一些,門電路獲得的電勢低,非門電路輸入端電壓變小,繼電器得到的電壓變高,路燈被點亮,故C錯誤,D正確。

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