牛津深圳版七下：Chapter 5 Electricity（共39张PPT）

(共39张PPT)
Chapter 4 Electricity
Task 1
Brainstorming :
What do we know about
energy What is it
It’s the power that
makes things work .
Click it
How do you feel if you
don’t have energy
Tired or sleepy .
What can you do to increase
your energy level
Rest , sleep , eat healthy food ,
exercise regularly
How can we supply machines
with energy
1. Plug them into an electricity source.
2. Use batteries .
3. Solar panels .
What happens if a machine
doesn’t have energy
It doesn’t work .
Task 2
invisible
flow through a wire, like water
What do we know about
electricity
Electricity is the power which
produced by rubbing , by a machine called a generator (发电机）or by chemical means ( e.g. a battery )
Do you know the following words , all connected with electricity
blackout , wire , energy , cable , shock
blackout
wire
energy
cable
shock
a period of darkness caused by a cut
in the electricity supply
a thread of metal
the power that makes things work
a thick , strong rope made of wire
a very strong force or blow
Can we change
electricity into
energy What kinds

Task 3
Heat energy
Movement energy
Light energy
Sound energy
Look at the following things .
What kind of energy do they
produce
Discussion:
Light energy
Light energy
Sound energy
Movement energy
Heat energy
Light energy
Movement energy
Heat energy
Movement energy
air –conditioner
washing machine
vacuum cleaner
rice cooker
television
iron
fridge
fan
micro-wave oven
recorder
radio
How many homeappliances
can you tell us in our life What kinds of energy do they produce
Where does electricity
come from
Task 3
1. Through thin wires .
2. Be connected to cables
buried under the ground.
3. A power station.
Discussion 1: What will happen if the electricity goes off today？
Discussion 2: What kind of advantages does
it have
No polution
Be transferred easily
Be changed into different kinds of energies easily
Be easily used
Task 4
Words and expressions :
1. change v.
We can’t see electricity , but we can change
it into energy .
Great changes have taken place in Shenzhen
since 1980.
2. changeable a.
The weather is changeable on top of the
mountain .
3.找头；（找回的）零钱
Here is your change.
Discussion 3:
1.What kind of disadvantages does
it have
If the electricity isn’t used correctly,
sometimes it will be dangerous for people ,
houses , homeappliances and so on .
2. What must we do to prevent the danger
electricity n. electrician n.
There is a problem with the electricity in Tom’s
flat . An electrician has come to deal with it .
electric a.
electric storm
electric shock
electrical a.
electrical apparatus
电器
electrical engineer
at last = in the end =finally
I finished my work at last .
I finished my work in the end .
I finished my work finally .
flow through
Eletricity flows through a wire .It’s like
water ,in a way .
bury v. buried buried
When people died , they are usually buried .
cable n.
Computers are connected with each other by
means of cables .
contain v. 包含；容纳；装有
Beer contains alcohol.
啤酒含有酒精。
The envelop contains some photos of her family.
energy n.
Young people usually have more energy
than the old.
年轻人通常比老年人有活力。
energetic a.
1. He is an energetic boy; he enjoys sports.
2."The more the young students worked,
the more energetic they became."
这些年青学生们越干越有劲。
in a way 在某种程度上, 稍稍
In a way , I agree with him .
Some of his ideas are right.
by the way
By the way , can you tell me when we will leave
in the way
The table is in the way .Please move it .
on the way
On the way to school , I saw Ken .
in this way
I have collected many stamps in this way .
look like =be like
1. He looks like his father .
= He is like his father .
2. ---- What’s his like
---- He is short and fat .
3. It looks like rain.
explain v. explanation n.
Can you explain it to me
= Can you give an explanation about it to me
careful a.
Be careful with the glass when you come in .
carefully ad.
She is listening to the music carefully.
careless a.
He is such a careless boy that he often makes
mistakes .
care n. ＆ v.
Please take good care of the baby.
I don’t care about it .
be careful of /with / about 当心； 小心
form v. 组成 ＆ n. 形式
1.Mike formed a football team in his class
with his classmates last term .
2. We can change it into different forms of energy.
3. She has a tall graceful form.
她有着高大优雅的外形。
invisible a. visible a. 明显的；看得见的
1. There are two visible differences between
these two coats.
2. Air is invisible .
3. The smoke from the fire was visible from
the road. 从马路上可以看见那火里冒出的烟。
be connected to
1. The wires in our flat are connected to cables
buried under the street .
2. Hong Kong and Shenzhen are connected by
Luohu Bridge .
connect v.
1. （常与to, with连用）连接；结合；连结
Will you connect this wire to the television
你把这根电线和电视机连上好吗？
2 . 接通电话
Connect me with Beijing University.
给我接北京大学。
go off 1. 中断；熄灭
The electricity in the room suddenly
went off.
2.爆炸；（爆竹、铃等）响
The signal pistol went off with a bang.
信号枪砰的一声响了。
switch on = turn on
Could you please switch on the lights
It’s too dark .
switch off= turn off
Turn off the air –conditioner when
you leave the room .
★ 情态动词
情态动词不能单独作谓语动词，后接其它动词
原形做谓语，没有人称和数的变化。
表示能够或不能做某事用can 或 can’t
A bird can fly .
Fish can’t live without water.
2. 告诉人们必须或禁止做某事用must或mustn’t
You must hand in your homework at once.
You mustn’t talk loudly in public.
3. 表示请求或允许做某事may 或can
May I come in
Can I open the door
4 .谈论该做或不该做某事用should , ought to 或
shouldn’t , ought not to
She should do her homework first .
They ought to finish the work on time .
they ought not to be late for school .
★★★Notes :
1、can 和 be able to的区别 : be able to 有
人称数和时态的变化。
I can come tomorrow .
I will be able to come tomorrow.
2、 在回答must的疑问句时，否定回答常用
needn’t 或don’t have to表示不必，而不用
mustn’t 。
Must we stay here
No, you need n’t . ( No, you don’t have to .)
3、 must be 表示肯定的猜测，意为“一定……”
can’t be 表示否定的猜测，意为“ 不可能……”
She must be a nurse .
I saw her in the library just now .She can’t be here .
4、must have done 也表示肯定的猜测，意为“ 一定做过……”
They must have cleaned the room . It’s so clean .他们一定打扫过房间了， 它这么干净。
Ⅰ.用适当的情态动词填空：。
1.__________you swim
2.We ___________operate the machine last week,but we can operate it now.
3.Don’t worry.You _____ return me this book tomorrow.
4.He said if he _________ask me another question.
5.My grandma is ill.You _____ talk so loudly here .
6.I can’t play with you.I __________finish my homework first.
7.I__________ get up early tomorrow.
8.______________you please open the window
Can
couldn’t
may
could
can’t
must
must
Could
9. Nobody ___________live without air.
10._________he speak Chinese Yes ,a little.
11. The book _________ be returned before Saturday.
12.__________I come in Yes ,please.
13. You ________give up smoking at once.It’s bad
for your eyes.
14. Excuse me ._________I ask you a question
15. __________you tell me where the station is
16. ______ I finish the work now No, you _________.
You _____ do it this evening.
17. May I use your e-dictionary Sorry , you _________.
I am using it now .
18. Look at the ground .It’s very wet .It _______
have rained last night.
can
Can
must
Can/May
must
May/Can
Can/Could
Must
needn’t
can/may
can’t
must
同义句改写:
1.You must clean your room yourself.
You _________ _________ clean your room yourself.
2. She can dance beautifully.
She ________ ________ ________ dance beautifully.
3. Wash your face at once.
You _______ wash your face ________.
4. Tom couldn’t find his bag.
He ________ not _______ _________to find
his bag.
5. Everyone ought to be here on time.
Everyone _____________ ________here on time.
have to
is able to
must
were able to
should be
immediately
Fill in the blanks with the words given in their proper
forms :
1.The weather in London is ____________.( change)
2. Please wait for me at the main _______ to the museum.
( enter )
3. Air is ___________. ( visible )
4. The scientists found some mummies _______ under the
pyramids . ( bury )
5. Can you ________ it to me again I can’t understand it.
( explanation )
6. I don’t feel like _________ football in the street .(play)
7. I prefer this kind of cloth. It feels ________. ( smoothly)
8. A: He must be in the office .
B: He _______be there . I saw him talking to his friend
in the classroom just now . ( can , may , must )
changeable
entrance
invisible
buried
explain
playing
smooth
can’t
9. The rain stopped us from _________ to school .(go)
10. When he came into the office, he found his staff busy
_____ . ( work )
11. Don’t ______ out of the window . It’s dangerous .(lean)
12. These wires are ______ to the cables buried
under the ground.(connection)
13. That’s not a bad ____________. ( explain)
14. Eletricity comes from a _________ station. (powerful)
15. Long ago , when people died , they are usually _____.
(bury)
16. Don’t touch the wire .You will get an ________
shock .( eletricity)
17. Tom is an _____ boy . He never feels tired .(energy)
18.There was an _____ repairing the eletric appliance .
(eletricity)
going
working
lean
connected
explanation
power
buried
eletrical
energetic
eletrician
Phrases :
look foolish
flow through
in a way
be careful with
look like
change into
be connected to cables
a power station
be full of =be filled with
go off
deal with=do with
switch on /off
be able to=can
Phrases :
play chess
play the guitar
make friends with
stay up late
get low marks
be short of money
ought to=should
look through the peephole
put away sth
stop …from doing sth
find sb/sth doing sth
members of staff
lean out of