如甲图所示的电路中，电源电压不变，R1为定值电阻．闭合开关S，将滑动变阻器R2的滑片P从a向b移动的过程中，电压表和电流表的示数变化情况如乙图所示，则电源电压为_1V，R1的阻值为_2Ω．当滑动变阻器_刷题宝

题干

如甲图所示的电路中，电源电压不变，R₁为定值电阻．闭合开关S，将滑动变阻器R₂的滑片P从a向b移动的过程中，电压表和电流表的示数变化情况如乙图所示，则电源电压为____V，R₁的阻值为____Ω．当滑动变阻器的滑片P在中点时，两电表的示数对应于乙图中的____点（选填“A”、“B”、“C”、“D”或“E”）．

上一题下一题 0.0难度选择题更新时间:2017-02-07 04:32:47

答案(点此获取答案解析）

6,10,B

同类题1

已知反比例函数y₁=

\frac{k}{x}

与一次函数y₂=mx+n的图象都经过A（1，﹣3），且当x=﹣3时，两个函数的函数值相等

同类题2

Thomas
I'm not very sure what I will be doing in ten years from now. Maybe a cook or a film director? But I can tell you what I’ll be doing next week – having a birthday party with friends.

Emma
There is one thing I really want to do and that is to travel around the world. Hopefully I will be living somewhere different in ten years, like Australia, or even Japan – who knows? I'd like to be a teacher and I'll probably be teaching English.

Ken
When I was little I always said I wanted to be a doctor and that hasn't changed. I will study medicine after I finish school. It will be a lot of hard work, but it's my dream. So in ten years I hope I will either be working in a hospital or as a doctor with my own surgery.

Mary
I'm not really sure about the future. I'm interested in the environment, so maybe I'll probably be working as a scientist and help develop energy or something like that.

同类题3

提出“大陆漂移假说”的是（　　）

同类题4

学校的各个学生社团 (associations) 正在纳新。面对众多的选择，你的朋友王林没了主意，写信向你求助。假如你是李越，你认为可以考虑参加篮球协会(the Basketball Association)或者英语俱乐部(the English Club)。请你用英语给王林写一封100词左右的信，推荐这两个社团，并分别说明推荐理由。

注意：信的开头和结尾已给出（不计入词数）。

Dear Wang Lin,

……

Yours sincerely,

Li Yue

同类题5

为了更好的解决能源问题，人们一方面研究如何提高燃料的燃烧效率，另一方面寻找新能源．以下做法不能提高燃料效率的是

（）

小学学科试题库

初中学科试题库

高中学科试题库