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一、选择题(选择一个正确答案,共15题,每题2分,计30分)
1.如图1所示的四个电路图中,与左边的实物图对应的是( )
图1
2.如图2所示的电路图中,开关S闭合后仅有L2灯能亮的是图( )
图2
3.如图3所示的电路中,甲、乙、丙是三只相同的小灯泡,则( )
A.S1断开,S2闭合时,丙灯不亮,甲、乙亮
B.S1、S2都闭合时,甲、乙、丙都亮
C.S1闭合、S2断开时,甲不亮,乙、丙亮
D.S1、S2都断开时,乙、丙不亮,甲亮
4.如图4所示,要使灯L1和L4串联,则关于1、2、3、4四个接线柱的连接,正确的是( )
图4
A.只需连接1和2
B.只需连接2和3
C.只需连接3和4
D.只需连接1和3
5.如图所示,为了使灯泡L1与L2串联接在电源上,下列做法中可行的是( )
A.只闭合S1
B.只闭合S2
C.只闭合S3
D.只闭合S1 和S3
6.如图5所示,两个灯泡始终完好,当开关S断开时,两个灯泡都发光,当开关S闭合时,可能出现的现象是( )
A.L1不亮,L2亮
B.L1和L2都亮;
C.L2不亮,L1亮
D.L1和L2都不亮。
7.一个学生使用电流表的时候,本应使用“-”和“3”两个接线柱,但误将“-”和“0.6”两个接线柱接入电路,而电流还是从“0.6”接线柱流进,从“-”接线柱流出,这样做的结果是( )
A.电流表的指针转过的角度变小了
B.电流表的指针不动
C.电流表的指针转过的角度变大了,电流表可能损坏
D.电流表的指针反向转动
8.教室里有4盏电灯,去掉其中任意一盏灯泡,另外三盏电灯都能继续发光,则这4盏灯( )
A.一定是串联
B.一定是并联
C.可能是串联,也可能是并联
D.无法判断
9.甲、乙两个办公室为了互相传呼方便,在两个办公室各装了一个电铃,要使两个办公室的任何一方按开关都能使对方的电铃发声,正确的电路图是(图6中的虚线表示房间的墙壁)( )
10.如图7示,当开关S闭合时,关于三只测量电路中电流表示数,正确的是( )
图7
A.A1表的示数最大
B.A2表的示数最大
C.A3表的示数最大
D.三只都要被损坏
11.如图8所示的电路中,三只不同灯泡,合上开关S后正常工作。三只电流表A1、A2、A3的示数分别为I1、I2、I3,则这三只电流表示数间的关系是( )
图8
A.I1=I2+I3
B.I2=I1—I3
C.I1>I2>I3
D.I1
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