[题目]有三只相同的灯泡组成的电路.若其中一只灯泡突然熄灭.则下面说法中正确的是( )A. 如果电路是串联电路.另外两只灯泡一定正常发光B. 如果电路是并联电路.另外两只灯泡一定也熄灭C. 如果电路是串联电路.另外两只灯泡一定也熄灭D. 如果电路是并联电路.另外两只灯泡一定正常发光题目和参考答案——青夏教育精英家教网—

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【题目】有三只相同的灯泡组成的电路，若其中一只灯泡突然熄灭（灯丝断），则下面说法中正确的是（）

A. 如果电路是串联电路，另外两只灯泡一定正常发光

B. 如果电路是并联电路，另外两只灯泡一定也熄灭

C. 如果电路是串联电路，另外两只灯泡一定也熄灭

D. 如果电路是并联电路，另外两只灯泡一定正常发光

【答案】CD

【解析】试题分析：电路的基本连接形式有两种：一种是串联，另一种是并联．

在串联电路中，只有一条电流的通路，用电器相互影响；

在并联电路中，有干路和支路之分，电流有多条路径，各支路用电器互不影响．

解：AC、因为串联电路电流只有一条路径，若其中一只灯泡突然熄灭，即该灯泡发生断路，故另外两只灯泡一定也熄灭；故A错误，C正确；

BD、因为并联电路中各用电器互不影响，若其中一只灯泡突然熄灭，即该灯泡所在的支路发生断路，故另外两只灯泡一定正常发光，故B错误，D正确．

故选CD．

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