(人教PEP)3年级英语上册《Recycle 1》单元测试

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人教版PEP三年级英语上册全册同步练习一课一练

人教版PEP三年级英语上册全册同步练习一课一练

Unit 1 Hello! Part A一、看图片,在正确的单词下面画“√”。

1. crayon pencil2. eraser pencil3. crayon ruler4. eraser ruler ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 二、给句子选图片。

( )1. Hello! A. B.( )2. I have a pencil. A. B.( )3. I can see “B”. A. B.( )4. I have an eraser. A. B.三、情景交际。

( )1. 当你与朋友相见时,你会先说:_________A. Hello.B. Bye.( )2. 陈红想让别人认识自己,她应该说:_________A. Hi.B. I'm Chen Hong.( )3. 李鹏想告诉别人他有一块橡皮,他会说:_________A. He's Li Peng!B. I have an eraser!( )4. 别人说自己有一把尺子,恰巧你也有,你会说:_________A. Me, too!B. Goodbye!( )5. 萨拉想邀请朋友一起玩,她会说:_________A. Let's play!B. Let's talk!答案一、1. crayon 2. pencil 3. ruler 4. eraser二、1. B 2. B 3. A 4. A三、1. A 2. B 3. B 4. A 5. AUnit 1 Hello!Part B一、单词或短语与图片手拉手。

1. pen2. pencil box3. bag4. bookA. B. C. D.二、看图选词。

( )1. Show me your__________A. pencilB. crayonC. eraser( )2. Open your_____________A. pencil boxB. rulerC. eraser( )3. Carry your____________A. rulerB. crayonC. bag( )4. Close your____________.A. pencil boxB. bookC. bag三、连词成句。

人教(PEP)版三年级起点五年级上册英语《Recycle 1》(一等奖课件) (9)

人教(PEP)版三年级起点五年级上册英语《Recycle 1》(一等奖课件) (9)

任选一项任务,尽可 能使用提示的句子, 同桌合作完成交流
滦州市中山实验学校
小学英语
Let's write: 利用已学知识介绍最喜爱的老师或学科 My favourite teacher/class.
滦州市中山实验学校小学英语ຫໍສະໝຸດ Read and answer
Underline
1.Who ’s David‘s Chinese teacher? 2.What ’s he/she like?
滦州市中山实验学校
小学英语
Read and answer
1.Who ’s David‘s Chinese teacher? Ms Zhang. 2.What ’s he/she like?
What do you have on...?I have...
Who ’s your Chinese/... teacher? Who ’s your favourite teacher ? What’s your favourite class ?
Why? What's he /she like?Is he/she...?
滦州市中山实验学校
小学英语
Read and judge,then talk in group.
Look at the schedule above.Tick or cross. 1.( × ) Students have science,maths and art on Wednesdays. 2.( √ ) David and Jean have two reading classes on Fridays. 3.( × ) They don’t have maths on Mondays. 4.( √ ) Jean and Dean have music classes on Tuesdays, Thursdays and Fridays.

五年级上册英语试题-Recycle 1 检测卷 人教(PEP)(含答案)

五年级上册英语试题-Recycle 1 检测卷 人教(PEP)(含答案)

一、听录音, 给下列图片标序号。

每小题听一遍。

(15分)()()()()()二、听录音, 把课程、星期、食物用线连起来。

每小题听两遍。

(15分)1. English Tues. fish2. science Mon. tomatoes3. maths Thur. beef4. PE Fri. chicken5. music Wed. noodles一、判断画线部分的读音是否相同, 相同的写“T”, 不同的写“F”。

(10分)()1. A. sorry B. baby C. happy()2. A. read B. bread C. eat()3. A. now B. how C. know()4. A. feed B. feet C. meet()5. A. slow B. snow C. yellow 二、单项选择。

(15分)()1. —What’s she like?—_________A. She’s hungry.B. He’s tall and kind.C. She’s strict.()2. —Is John funny?—_________A. Yes, he is.B. No, she isn’t.C. Yes, she is.()3. —Who’s your English teacher?—_________A. Miss white.B. Miss White.C. miss white.()4. —What would you like to eat?—_________A. Beef noodles.B. Orange juice.C. Tomato sandwich.()5. —What do you do on weekends?—I often _________ TV and play sports.A. look atB. readC. watch三、根据图片及首字母提示补全单词。

三年级上册英语Recycle 1 第一课时

三年级上册英语Recycle 1 第一课时

七彩课堂 听录音跟读Read
用表格形式总结
伴你成长 aloud。
学过的问候语。
1.Man1&2: Morning! 2.Chen Jie: Good morning. I’m Chen Jie. This is Sarah.
3. Man1: My name’s Zip. Man2: I’m Zoom. Sarah: White hands?
Chen Jie: Brown arms? 4.Zip: Hello!
3. Man1: My name’s Zip. Man2: I’m Zoom.
Sarah: White hands? Chen Jie: Brown arms?
4.Zip: Hello! Chen Jie: Look! Zoom and Zip! 5.Sarah: Hey! Man1&2: Bye!
人 教 PEP 版 英 语 三 年 级 上 册
Recycle 1
Read aloud
Warm up
Sing a song
How are you?
Hello, Mike. Hello, Chen Jie. Hello, hello! How are you? This is Mary. This is Willy. Nice to meet you. How are you? I’m fine. I’m fine. Thank you, thank you very much. I’m fine. I’m fine. Thank you, thank you very much.
Exercises 一、单项选择。
( A )1.—Hello!
A. Hபைடு நூலகம்llo!

四年级上册英语单元测试-Recycle 1人教(PEP)

四年级上册英语单元测试-Recycle 1人教(PEP)

Recycle1一、Read and choose(选出与所给单词画线部分读音相同的选项)( A )1.K a te A.n a me B.h a ve C.a pple( C )2.d o g A.h o pe B.b oo k C.d o ll( B )3.c a t A.l a ke B.h a t C.r a ce( A )4.s i x A.f i t B.n i ne C.t i me二、Read and choose(根据图片选择相应的单词)A.schoolbagB.English bookC.long hairD.glassesE.strongF.short hairG.classroomH.picture三、Read and choose(读一读,选一选)( B )1.Let’s go see your seat.A.orB.andC.for( C )2.What’s the kitchen?A.onB.atC.in( B )3.I see it?A.AmB.MayC.How( B )4.He big eyes.A.haveB.hasC.is四、Look and judge(看图片,判断下列句子与图片是“T”否“F”相符)( T )1.The schoolbag is on the desk.( T )2.The book is near the schoolbag.( F )3.The chair is under the desk.( F )4.The cat is on the chair.( F )5.The pencil box is in the schoolbag.五、Read and write(读一读,写一写)I 1.have(have/has) a new friend.2.Her(His/Her) name is Maria.She is a cute 3.girl(boy/girl).She 4.has(have/has) long yellow hair,big 5.eyes(eye/eyes) and a 6.small(small/quiet)nose.She is active.She is strong.Her seat is 7.near(near/on) the window.She 8.likes(like/likes) English.I 9.am(am/is) Amy.I 10.like(like/likes) English,too.I 11.am(have/am) thin and tall.I 12.have(have/has) a new schoolbag.Its 13.colour(colour/name) is red.六、Read and choose(读一读,选一选)( A )1.你想邀请朋友一起去看你的新教室,你应说:A.Let’s go and see.B.Let me go and see.( B )2.你想问杰克的新朋友叫什么名字,你应问:A.What’s your name?B.What’s his name?( B )3.约翰要擦窗户,他会这样对你说:A.Let me clean the desk.B.Let me clean the window.( B )4.你的朋友戴着眼镜,你这样描述他:A.He has glass.B.He has glasses.( B )5.当你想告诉同学你有42本故事书,你说:A.I have thirty-two picture books.B.I have forty-two storybooks.( A )6.当你向别人介绍“他是短头发”,你说:A.He has short hair.B.He has long hair.七、Read and choose(读一读,选一选)( B )1.Where is it?( D )2.Let me clean the window.( C )3.What colour is it?( A )4.What’s in it?( E )5.What’s his name?( G )6.A boy or girl?( F )7.May I see it?A.An English book and a notebook.B.It’s near the pencil.C.It’s black and white.D.OK!E.His name is Jack.F.Sure,here you are.G.A girl.八、Read and number(给句子排序)( 5 )Her name is Li Ling.And she has glasses. ( 2 )Really?A boy or girl?( 1 )We have a new classmate.( 3 )A girl.( 4 )What’s her name?九、Read and write(读一读,写一写)long hair teacher’s desk thin toys schoolbag I have a friend.Her name is Amy.She is 1.thin.She has 2.long hair.She has many 3.toys.Her 4.schoolbag is heavy.Her seat is near the 5.teacher’s desk.We are good friends.十、Read and choose(阅读短文,判断正“T”误“F”)Look at this picture.It’s our new classroom.It’s big and nice.We clean the cl assroom every week.Look!Amy is cleaning the windows.Mike is cleaning the blackboard.Chen Jie is sweeping the floor.This is my new friend,Zhang Peng.He’s from China.He’s tall and strong.He has short black hair and big eyes.He likes sports and science.We often play together.I enjoy my school life very much.( T )1.My new classroom is nice and big.( F )2.Amy is cleaning the blackboard.( F )3.Zhang Peng is my old friend.( T )4.Zhang Peng is tall and strong.( T )5.Zhang Peng has short hair.Recycle 2一、根据给出的意思填写单词。

人教(PEP)版三年级起点五年级上册英语《Recycle 1》(一等奖课件) (34)

人教(PEP)版三年级起点五年级上册英语《Recycle 1》(一等奖课件) (34)
We love our teachers!
David: These are my teachers. Chen Jie: Who's your Chinese teacher?
David: Look at that picture. That's Ms Zhang, our Chinese teacher.
Fridays.
× (
)3.They don't have maths on Mondays.
√ (
)4.Jean and Dean have music classes on Tuesdays,
Thursdays and Fridays.
Homework.
1.完成配套练习册P13,P14. 2.预习下节课的内容。
1.Who's David's Chinese teacher? 2.What's she like?
Chen Jie meets some new friends at Willow
Primary School.Listen to the dialogues and fill
in the table.
Days of the week
Time
Monday English
Tuesday maths
Wednesday scienceMorningscience English
computer class
science computer
maths class
PE maths English
Thursday
(
)1.What is David's favourite class?

英语人教PEP版三年级上精品教案-Recycle 1-教案(含反思)

Recycle 1第1 课时【教学目标】1.复习1—3 单元所学的日常用语。

2.能在实际情景中运用Hello.Good morning.Nice to meet you.This is… What’s your name? How are you? 等用语。

【教学重难点】1.根据情境掌握Read aloud.部分的故事。

2.复习有关打招呼、问候、介绍、道别的英语会话。

3.能根据所给图片用颜色名词和身体部位名词说简单的英语短语。

【教学方法】1.角色表演教学法:教师利用课本中的对话,让学生分角色表演,在角色表演中巩固单词和句型。

2.听说领先教学法:教师播放录音,学生根据听力内容选出所听到的短语。

教学过程教师批注Step 1:Warm-up1.Greeting:T:Hi/Hello.How are you?Ss:I’m fine,thank you!2.教师播放英文歌曲ABC song和Hello!师生共唱。

然后学习新歌曲How are you?Step 2:Presentation1.总结所学问候语等,尽量让学生自己总结出来。

(1)当我们想同对方打招呼或问候时(为学生出示此情景图)可以说:Hello./Hi.(什么时间都可以)Good morning./Good afternoon.(不同时间,不同选择)How are you? Fine,thank you./Very well,thanks.(用于熟人之间有一段时间未见面,或是对方身体欠佳,或是较正式地向别人打招呼等场合)Nice to meet you.Nice to meet you,too.(初次见面表示很高兴见到对方)(2)当我们想了解对方姓名或介绍自己时(为学生出示此情景图)可以说:What’s your name?Your name,please?My name is…/I’m…(3)当我们为别人介绍伙伴时(为学生出示此情景图)可以说:This is…(4)当我们建议别人做某事时(为学生出示此情景图)可以说: Let’s…!2.你是谁讲台上的学生面朝黑板问:Who are you? 下面的学生回答:My name is…/I’m…可以说假名也可以说真名,由发问者自己判断Yes 或No。

Recycle 2 单元测试01 -人教PEP版英语四年级上册测试练习试卷(含答案)

Recycle2单元测试01分值:100分;考试时间:60分钟学校:___________姓名:___________班级:___________考号:___________题号一二三四五六七总分得分一、选择题(每题 1.5分,共30分)找出不同类的单词。

1.A.glasses B.friendly C.quiet D.strong 2.A.fridge B.kitchen C.sofa D.table 3.A.father B.farmer C.cook D.teacher 4.A.chopsticks B.fork C.spoon D.soup 5.A.window B.near C.light D.fan给下列句子选择正确的翻译。

6.This is my living room.()A.这是我的卧室。

B.这是我的客厅。

7.He’s Father Christmas.()A.他是圣诞老人。

B.他是我爸爸。

8.How many pencils are there on the desk?()A.桌子上有几支铅笔?B.桌子上有几支钢笔?9.My crayons are in the study.()A.我的蜡笔在客厅里。

B.我的蜡笔在书房里。

10.Would you like some juice?()A.你需要一些果汁吗?B.你需要一些水吗?11.—Is your sister in the study?()—________.A.Yes,he is B.No,she is C.Yes,she is 12.My father’s sister is my______.()A.sister B.uncle C.aunt13.Let’s________the bus.()A.get up B.get on14.-______your aunt?()-He is a student.A.Who's B.What's C.What15.—Where is my cat?()—_______A.It’s in the kitchen.B.It’s in the bedroom. 16.提醒妈妈戴上帽子,应说:()A.Put on your hat.B.Take off your hat.17.当别人对你说“thank you”时,你应该回答:()A.No,thank you.B.You’re welcome.18.假如你的爷爷是农民,你可以说:()A.He is a doctor.B.He is a farmer.C.She is a doctor. 19.你想表达:“让我擦窗户吧!”怎么说?()A.Let me clean the window!B.Turn on the light! 20.“打扰了”应该说:()A.Excuse me.B.Good night.二、阅读理解(每个阅读10分,共30分)I have a new friend.His name is John.He is an English boy.He has short hair and big eyes.He's tall and strong.He likes music.He has a happy family.There are four people in his family.His father is a doctor.His mother is a doctor,too.He has a baby brother.His brother is little and cute.They all like China.21.John is an______boy.()A.Chinese B.English C.China22.John likes______.()A.music B.maths C.P.E23.John's mother is a______.()A.doctor B.teacher C.nurse24.There are______people in John's family.()A.seven B.three C.four25.John's brother is______.()A.little and cute B.little and quiet C.cute and strongHello,I’m Mike.I’m a doctor.I’m tall and strong.I like music and sports.I often read storybooks.Look,this is my family photo.I have a sister,Ann.We are good friends.She is a nurse.She is thin and quiet.She likes milk very much. 26.Mike is tall and thin.()27.Mike likes music and sports.()28.Mike has a brother.()29.Ann is a doctor.()30.Ann is tall and quiet.()Today I go to a restaurant with my parents.There are some specials.I’d like some beef noodles.I can use chopsticks.My father would like some rice,chicken and soup. He can use a spoon and chopsticks.My mother would like some bread and vegetables. She can use a knife and fork.31.I go to a restaurant with my_________.()A.grandpa and grandma B.father and motherC.uncle and aunt32.(1)I’d like some.I can use.(2)My father would like some rice,and.He can use a and chopsticks.(3)My mother would like some and.She can use aand.a. b. c. d. e.f.g.h.i.三、排序题(每题2分,共10分)33.读一读,给句子排序,完成故事。

人教版(PEP)四上《Recycle1》说课稿

人教版(PEP)四上《Recycle 1》说课稿一. 教材分析《Recycle 1》是人教版(PEP)四年级上册的一篇课文,属于单元循环复习性质的材料。

本课主要是对第一单元的语言点进行了复习,包括一般现在时态的肯定句、否定句和一般疑问句,以及常用的日常交际用语。

课文内容通过三个部分展开:A部分是课本内容回顾,B部分是听力练习,C部分是口语交际和写作练习。

二. 学情分析四年级的学生已经掌握了基本的英语语法知识和一定的词汇量,对于一般现在时态的肯定句、否定句和一般疑问句已经有了一定的理解。

但是,学生在听力理解和口语交际方面还存在一定的困难,需要通过本节课的学习进一步提高。

三. 说教学目标1.知识目标:通过复习,使学生进一步掌握一般现在时态的肯定句、否定句和一般疑问句的构成和用法,提高学生的语法知识水平。

2.能力目标:提高学生的听力理解能力,能够听懂并正确回答一般现在时态的一般疑问句;提高学生的口语交际能力,能够熟练运用一般现在时态进行日常交流。

3.情感目标:激发学生学习英语的兴趣,培养学生的团队合作意识和自主学习能力。

四. 说教学重难点1.教学重点:一般现在时态的肯定句、否定句和一般疑问句的构成和用法。

2.教学难点:听力理解能力和口语交际能力的提高,尤其是学生对于一般现在时态的一般疑问句的回答。

五. 说教学方法与手段1.教学方法:采用任务型教学法,通过听力、口语、写作等多种形式的任务,引导学生主动参与课堂,提高学生的实际运用语言的能力。

2.教学手段:利用多媒体课件、录音机、课文插图等教学辅助工具,创设生动、直观的学习环境,帮助学生更好地理解和运用语言。

六. 说教学过程1.热身(5分钟):通过与本课主题相关的歌曲或游戏,激发学生的学习兴趣,营造轻松愉快的课堂氛围。

2.导入(10分钟):回顾一般现在时态的肯定句、否定句和一般疑问句的构成和用法,为新课的学习做好铺垫。

3.听力练习(10分钟):播放课文中的听力材料,学生听后回答问题。

三年级上册英语 Recycle 1备课

Recycle 1单元备课一、单元整体分析本单元是义务教育灵通版(pep)小学英语教科书三年级上册复习一。

这是一个针对前三个单元的重点句型和重点词汇设计的综合复习单元。

由对话阅读、听音涂色、梯子与蛇游戏、写一写、连一连、读一读、歌曲等活动组成。

在对话阅读活动中,Chen Jie 和Sarah碰到了Zoom和Zip,他们互相交换名字,并互相介绍。

结果,过一会儿,又一对Zoom和Zip出现了。

前一对Zoom和Zip急匆匆地跑掉了。

故事非常有趣,而且留给了学生们很多“破案”的线索,比如衣服的颜色、手的颜色等,这会让学生充满兴趣和学习的积极性,大大提高他们的参与热情。

这个故事复习了前两个单元学习的如何介绍他人,如何向他人打招呼问好,如何介绍自己的名字,以及颜色和身体部位的知识。

学生在学习故事的同时,可以复习前边学过的内容,提高自己的综合表达能力。

听一听,涂颜色活动是以万圣节为背景的一个复习颜色的活动。

学生通过听录音,给相应的“怪物”涂上正确的颜色。

在此之后,还有一个看一看,判断正误的活动,学生需要认真观察图片,然后选择正确的颜色和身体部位。

在这个活动中,可以适当向学生传达万圣节的相关知识,以便学生能够更加深入地理解这个活动。

“梯子和蛇”游戏用来复习文具、颜色、身体部位的单词以及前三单元的主要句型,还有字母知识。

在玩的过程中,学生先掷骰子,决定走的步数。

停在哪个图片上,就要完成看图说话活动,需要根据图片展示的内容来自己组织对话或句子。

在行进过程中遇到梯子,则上升到梯子所在的上一层。

遇到蛇,则需要下降到下一层。

谁最选走到终点谁赢。

这个游戏可以综合复习前三个单元的所有内容,同时还能激发学生的学习兴趣。

连一连,写一写,读一读活动是针对字母及其发音的活动。

学生需要将大小写字母连线,并在格线内写一写。

大写字母旁是动物妈妈,小写字母旁是动物宝宝,学生找一找就很容易发现。

这样的设置提升了活动的趣味性,更能吸引学生参与。

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(人教PEP)3年级英语上册《Recycle 1》单元测试 Exercise 1

I.Listen and circle.(圈出你所听到的单词) 1. pen pencil 2. bag book 3. head hand 4. brown black 5. eye ear 6. foot finger

Ⅱ.Listen and number. (听音标号)

( ) ( ) ( ) ( )

( ) ( ) Ⅲ.Choose and write. (选出不同类的单词,把字母编号写在左边的括号中。) ( ) 1. A. red B. leg C. black ( ) 2. A. show B. touch C. foot ( ) 3. A. oom B. ruler C. Sarah ( ) 4. A. bag B. white C. green ( ) 5. A. body B. wave C. shake

Ⅳ.Read and match. (连线) See you. 我们一起去上学吧。 Let’s go to school. 我有一只猫。 I have a cat. 再见! ay I have a look? 给你。 Here you are. 能给我看看吗?

Exercise 2 Ⅰ.Listen and choose.(听音选择) ( ) 1. a. body b. book c. bag ( ) 2. a. eye b. ear c. arm ( ) 3. a. hand b. head c. how ( ) 4. a. black b. white c. brown ( ) 5. a. pink b. purple c. pencil Ⅱ. Listen and colour. (听音涂色)

Ⅲ.Circle and match. (圈出正确的单词并连线) 1.pencil 2.crayon 3.hand 4.bag 5.ruler

Ⅳ.Choose and write.(找出合适的答语,把编号写在左边的括号中) ( ) 1.Nice teet you. A. See you! ( ) 2.hat’s your name? B. Hi! ( ) 3.Hello! C. y name’s John. ( ) 4.Goodbye! D. I’m fine. Thank you. ( ) 5.How are you? E. Nice teet you, too.

d h o l h s h a n d e l b l o y l u n l p b q q p e n c i l t g d e r o m o p r t v d e b a g i t r w f c z m j e k l d f c r a y o n q p l x a b e r l n f a c r u l e r l s o p b d p p t Exercise 1 Ⅰ.Listen and choose.(选出你所听到的单词) 1. pen ( pencil ) 2. bag ( book ) 3. head ( hand ) 4. ( brown ) black 5. eye ( ear ) 6. foot ( finger )

Ⅱ.Listen and number.(听录音标号)

( 2 ) ( 5 ) ( 4 ) ( 3 ) Ⅲ.Choose and write.(选出不同类的单词,把字母编号写在左边的括号中) ( B ) 1. A. red B. leg C. black ( C ) 2. A. show B. touch C. foot ( B ) 3. A. oom B. ruler C. Sarah ( A ) 4. A. bag B. white C. green ( A ) 5. A. body B. wave C. shake

Ⅳ.Read and match.(从表格中所给的字母串中分别找出图画所示事物的单词并把单词与图片连线。) See you. 我们一起去上学吧。 Let’s go to school. 我有一只猫。 I have a cat. 再见。 ay I have a look? 给你。 Here you are. 能给我看看吗?

Exercise 2 Ⅰ.Listen and choose.(听录音选择) ( a ) 1. a. body b. book c. bag ( b ) 2. a. eye b. ear c. arm ( a ) 3. a. hand b. head c. how ( c ) 4. a. black b. white c. brown ( b ) 5. a. pink b. purple c. pencil

Ⅱ.Listen and colour. (听录音涂色)

1. 2. 3. 4. 5. blue Pink green Yellow red

Ⅳ.Circle and match. (从表格中所给的字母串中分别找出图画所示事物的单词并把单词与图片连线) 1. pencil 2. crayon 3. hand 4. bag 5. ruler

Ⅳ.Choose and write. (找出合适的答语,把它的编号写在左边的括号中) ( E ) 1. Nice teet you. A. See you! ( C ) 2. hat’s your name? B. Hi! ( B ) 3. Hello! C. y name’s John. ( A ) 4. Goodbye! D. I’m fine. Thank you. ( D ) 5. How are you? E. Nice teet you, too.

Exercise 1听力材料 Ⅰ.Listen and choose. (选出你所听到的单词) 1. pencil 2. book 3. hand 4. brown 5. ear 6. Finger

Ⅱ.Listen and number. (听录音标号)

d h o l h s (h a n d) e l b l o y l u n l p b q q (p e n c i l) t g d e r o m o p r t v d e (b a g) I t r w f c z m j e k l d f (c r a y o n) q p l x a b e r l n f a c (r u l e r) l s o p b d p p t 1. — Goodbye, iss hite. — Bye! 2. Close your pencil-case. 3. Let’s go to school. 4. Chen: This is ike. Sarah: Nice teet you. ike: Nice teet you, too. 5. Touch your ear.

Exercise 2听力材料 Ⅰ.Listen and choose.(听录音选择) 1. body 2. ear 3. hand 4. brown 5. purple Ⅱ.Listen and colour.(听录音涂色) 1. Colour the book blue. 2. Colour the hand pink. 3. Colour the ruler green. 4. Colour the foot yellow. 5. Colour the pencil-case red. 5.3 变压器 课时作业 基础达标

1. 关于理想变压器的工作原理,以下说法正确的是( )

A. 通有正弦交变电流的原线圈产生的磁通量不变 B. 穿过原、副线圈的磁通量在任何时候都不相等 C. 穿过副线圈磁通量的变化使得副线圈产生感应电动势 D. 原线圈中的电流通过铁芯流到了副线圈 【解析】 通有正弦交变电流的原线圈产生的磁场是变化的,由 于面积 S 不变,故磁通量 Φ 变化,A 错误;因理想变压器无漏磁,故 B 错误;由互感现象知C 正确;原线圈中的电能转化为磁场能又转化 为电能,原副线圈通过磁场联系在一起,故D 错误. 【答案】 C 2. 变压器原线圈 1400 匝,副线圈 700 匝并接有电阻 R,当变压

器工作时原、副线圈中( ) A.频率比为 2 :1 B.功率比为 2 :1 C.电流比为 2 :1 D.电压比为 2 :1 【解析】 由于变压器不能改变交变电流的功率和频率,所以原、 副线圈电流功率和频率之比均为 1 :1,A、B 错误;而根据电流与 I n 匝数之间关系I2=n1,得电流比为 1 :2,C 错误;根据电压与匝数之

U n 间关系U =n ,得电压比为 2 :1,D 正确. 2 2

【答案】 D 3.

用一理想变压器向一负载 R 供电.如图所示,当增大负载电阻 R 时,原线圈中的电流 I 和副线圈中的电流 I 之间的关系是( ) A. I 增大,I 也增大

B. I 增大,I 却减小 C. I 减小,I 也减小 D. I 减小,I 却增大 U 【解析】 增大负载电阻 R 时,由欧姆定律 I= R 可得 I 减小,

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