八年级英语A-dangerous-servant课件.ppt

1、8B Chapter 4A dangerous servant8B Chapter 31.What do you think of electricity?Why?2.Electricity gives power for all kinds of electrical appliances.Can you name some of the electrical appliances we use in our lives?(When we plug an appliance into the wall socket,we are using electricity produced by a

2、 generator.)electrical appliancesan air conditionera blendera CD player a computer a cooker a hair dryera lamp a kettleelectrical appliancesa heatera fan an irona microwavean ovena printerelectrical appliancesa recordera refrigeratora TV seta vacuum cleanera video playera washing machinea mobile pho

3、ne(a fridge)a robotWhere does a robots energy come from?Its energy comes from electricity.vWhere does our energy come from?(Energy is the power that makes things work.)Perhaps without electricity our lives will not be interesting.Now let us talk about electricity.What is it?Electricity is the power

4、which is produced by rubbing(friction),by a machine called a generator or by chemical means(e.g.a battery).Can we see it?No,its a kind of energy that we cannot see.Its invisible.Can we touch it?No,we cant.We may get an electric shock.Its dangerous.Power stations pylonshomeDo you know how electricity

5、 comes to us?Do you know how electricity comes to us?The pylons carry wires.Wires carry electricity.Electricity comes into our flats through thin wires,and the thin wires are connected to thick wires.The thick wires are called cables and they are buried underground.Cables are connected to power stat

6、ions.Power stations make electricity.Homework:1.Go over the vocabulary items and recite them.2.Listen to the recording of the article and read it aloud several times.3.Finish Ex.C/D/E on page 46,47.8B Chapter 4A dangerous servant8B Chapter 3Ex.Fill in the blanks with proper words:wire energy cable s

7、hock1.Young people have more than old people.2.Dont touch the !Youll get an electric .3.When the workers were digging up the road,they cut the ,and as a result,there was a blackout in the area.a thread of metal the power that makes things work a thick,strong rope made of wire a very strong force or

8、blow a period of darkness caused by a cut in the electricity supplyWe can change electricity into energy that we can see,hear,or feel.We can also change it into energy that move things.light energysound energyheat energymovement energy(movement-moving or being moved)Can you tell what kind(s)of energ

9、y do they produce?Vocabulary electricity n.electric a.电的，电动的，发电的电的，电动的，发电的 electric cables电缆电缆 an electric kettle 电壶电壶 electric current电流电流 electrical a.电的，电气科学的电的，电气科学的 electrical appliances 电器电器 an electrical engineer 电气工程师电气工程师 electrician n.电工，电工，电学家电学家 If any of the electrical appliances or the

10、 wiring in your home is out of order,you need to find an electrician to repair them.1)When did the story happen?2)Benny didnt want to trick Daisy,did he?3)Does Benny know what electricity is?4)Why must we be careful with electricity?5)How does electricity come into our homes?6)What are the wires con

11、nected to?7)What did Daisy buy for her brother?8)Does Daisy know what electricity is?9)How do batteries work?10)What do you think of Benny and Daisy?Read aloud the article and answer the following questions:I.Complete the sentences:1)Its to touch the electricity with your hand.(danger)2)We can buy s

12、ugar in .(pack)3)He had no for why he was late.(explain)4)Water.has three -solid,liquid and gas.(form)5)The thief the treasure under the tree.(bury)6)In the old days,the rich usually asked to do the housework for them.(serve)7)Tim works as a newspaper boy and he gets his pay from his boss .(month)Ho

13、mework:II.Read and recite paragraphs 413.III.Read and recite the words and expressions.8B Chapter 4A dangerous servant8B Chapter 3Public transporttrain busundergroundplanemaglev trainphrases热能热能/电能电能/声能声能动能动能/原子能原子能精力充沛的精力充沛的不同形式的能量不同形式的能量一包信件一包信件一盒一盒20支香烟支香烟终于终于起先起先埋电缆埋电缆在某种程度上在某种程度上谨慎，小心谨慎，小心变成变成欺

14、骗，欺骗，heat energy/light energy/sound energymovement energy/atomic energybe energetic/be full of energydifferent forms of energya packet of lettersa packet of 20 cigarettesat last/in the end/finallyat first/at the beginning ofbury cablesin a waybe careful with/ofchange into/turn intotrick somebody/pla

15、y a trick(joke)on somebodyFill in the blanks:fool battery happiness danger polite real produce1.The trees can protect themselves by a chemical that makes their leaves taste nasty.2.Im sorry about my being late,sir.3.What is ,water or fire?4.Would you like to get me some?5.Dont always do such things.

16、6.He answered that question yesterday.7.Although they are poor,they are .join together in the end that cannot be seen words that make sth.clear or say what sth.means shapes or kinds power that makes things work or makes people do things put something or someone in the ground a very wide smile thick ropes of wire which electricity passes through power that(comes through wires and)can make heat,sound and light,and move things a machine that tells you the amount used (done or happening)every month