问题
选择题
将标有“6V 6w”的灯Ll和标有”6V 3w”的灯L2串联接入电路中,如图,不考虑灯丝电阻值随温度的变化,若闭合开关后,Ll的实际功率为1.5 w,则L2的实际功率和电源电压分别为

A.3w 12V
B.6w 9V
C.1.5w 12V
D.3w 9V
答案
答案:D
将标有“6V 6w”的灯Ll和标有”6V 3w”的灯L2串联接入电路中,如图,不考虑灯丝电阻值随温度的变化,若闭合开关后,Ll的实际功率为1.5 w,则L2的实际功率和电源电压分别为
A.3w 12V
B.6w 9V
C.1.5w 12V
D.3w 9V
答案:D
补全对话。 | |
Mike: Hello! John: Hello! 1 Mike: This is Mike. Who's that? John: 2 What do you want to do this afternoon? Mike: 3 John: There is a football match this afternoon. And I have two tickets here. Let's go to watch it. Mike :4 John: Where do we meet? Mike :5 John: OK. See you there at two. Mike: See you.
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