小亮同学做测定“小灯泡的额定电功率”实验时所用器材有电压为6V的电源、额定电压为

题型:实验题

问题:

小亮同学做测定“小灯泡的额定电功率”实验时所用器材有电压为6V的电源、额定电压为2.5V的小灯泡(小灯泡的额定功率小于1W)、滑动变阻器(50Ω1A)、以及符合实验要求的电压表和电流表、开关和导线。如图(甲)是小亮同学没有连接完整的电路。

(1)请你用笔画线代替导线,将图(甲)所示的电路连接完整。

(2)小亮同学连好电路后闭合开关,移动滑动变阻器滑片P,发现小灯泡始终不亮,电压表有示数,电流表无示数,则故障可能是              

(3)小亮同学排除故障后闭合开关,移动滑动变阻器滑片P,同时,眼睛应观察            (选填序号)。

A.小灯泡亮度           B.电压表示数   

C.电流表示数           D.滑动变阻器滑片

(5)小亮同学移动滑动变阻器滑片P到某处时,电压表的示数为2.2V,要测量小灯泡的额定功率时,应将滑片P向        端移动(选填“A”或“B" )。当小灯泡正常发光时,电流表示数如图(乙)所示,则小灯泡的额定功率是       W.

考点:测量电功率的实验
题型:实验题

阅读理解。

      One day Mr and Mrs Wilson and their children were going to begin their holiday, and they had to be at

the airport at eleven forty in the morning. "It'll take us half an hour to get there in the car," Mr Wilson said,

"so we all have to be ready by eleven o' clock. Nobody should be late."

      At ten minutes to eleven they were still all running around doing things, except Mrs Wilson. She was

sitting quietly on a chair in the garden enjoying the sun. Her husband and children were surprised that she

wasn't in a hurry. 

      When they sat in the car, Mrs Wilson said to them, "Well, I knew that this was going to happen, so

before I went to bed last night, I moved all the clocks ahead twenty minutes. So now we can go to the

airport quietly without worrying about being late."

根据短文内容,判断下列句子的正误。正确的在括号中写“T”,错误的写“F”。

( )1. The Wilsons were busy getting ready for a holiday.

( )2. They would travel by air.

( )3. Their plane was going to take off at 11:40.

( )4. Mrs Wilson wasn't in a hurry because she knew there was enough time for them.

( )5. They were twenty minutes late for their plane.

题型:实验题

依次填入下列各句横线处的词语,最恰当的一组是     (    )

①及至时过境迁,传统文化或者与时俱进,     出新的内容与形式。

②我时常徜徉在中国古典诗歌的天地里,      耐人寻味的思想。

③只有久居肖邦故园这一带的人才会跟这里的         结下不解之缘。

④一个人年纪大了而又荒唐起来       赊帐的时候,他决不赊格斯拉兄弟俩的账。  

A.演化捕捉景物以致于

B.演化捉摸景致以至于

C.衍化捉摸景致以致于

D.衍化捕捉景物以至于

题型:实验题

选择合适的答案序号填在横线上。

A.物理变化 B.化学变化 C.物理性质 D.化学性质

①在通常状况下,水是无色、无味的液体______。

②酒精受热变成了酒精蒸气____。

③镁条能在空气中燃烧生成氧化镁_______。

④石蜡燃烧生成了二氧化碳和水_______。

题型:实验题

提出游戏“剩余精力说”理论是哪位科学家?

A、弗洛伊德

B、格罗斯

C、斯宾塞

D、霍尔

题型:实验题

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