【題目】有三只相同的燈泡組成的電路,若其中一只燈泡突然熄滅(燈絲斷),則下面說(shuō)法中正確的是( )

A. 如果電路是串聯(lián)電路,另外兩只燈泡一定正常發(fā)光

B. 如果電路是并聯(lián)電路,另外兩只燈泡一定也熄滅

C. 如果電路是串聯(lián)電路,另外兩只燈泡一定也熄滅

D. 如果電路是并聯(lián)電路,另外兩只燈泡一定正常發(fā)光

【答案】CD

【解析】試題分析:電路的基本連接形式有兩種:一種是串聯(lián),另一種是并聯(lián).

在串聯(lián)電路中,只有一條電流的通路,用電器相互影響;

在并聯(lián)電路中,有干路和支路之分,電流有多條路徑,各支路用電器互不影響.

解:AC、因?yàn)榇?lián)電路電流只有一條路徑,若其中一只燈泡突然熄滅,即該燈泡發(fā)生斷路,故另外兩只燈泡一定也熄滅;故A錯(cuò)誤,C正確;

BD、因?yàn)椴⒙?lián)電路中各用電器互不影響,若其中一只燈泡突然熄滅,即該燈泡所在的支路發(fā)生斷路,故另外兩只燈泡一定正常發(fā)光,故B錯(cuò)誤,D正確.

故選CD

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