（10分）如图一台理想变压器,其原线圈匝,副线圈匝,并接一个的负

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问题选择题

（10分）如图一台理想变压器,其原线圈匝,副线圈匝,并接一个的负载电阻,其它电阻均不计。求：

（1）当原线圈接在直流电源上时,电压表示数为多大？

（2）当原线圈接在输出电压的交变电源上时,电压表示数和电流表的示数各为多大？此时变压器的输入功率为多大?

答案

0 440V

题目分析：(1)直流电不能产生电磁感应，故副线圈电压为零

电压表示数为零

(2)有效值，

补全对话，情景问答

补全对话。

Susan: Hello. 1_____ Kate?

Mike: Sorry. She isn't in right now. Is that Susan speaking?

Susan: Yes. Who's that?

Mike: This is Mike. 2_____?

Susan: Fine, thanks. Can I leave a message?

Mike: Of course, 3_____, please. I'll go and get a pen. (Soon Mike returns.)

Mike: OK, please.

Susan: I'd like to ask her if she will go to the English Festival next week.

Will you please tell her to call me back when she returns?

Mike: No problem. 4_____?

Susan: It's 78340631.

Mike: OK, bye-bye.

Susan: Thanks. 5_____.

单项选择题

消防控制室、消防水泵房、（）的照明支线，应接在消防配电线路上。

A、自备发电机房

B、消防电梯

C、防烟楼梯间及前室

D、可燃物品库房