Module 1 Unit 3 Electricity 课件 (共20张PPT)

(共20张PPT)
Electricity
Cartoon talk
What do you know about …
Before you read
Read
CONTENTS PAGE
Reading (I)
Cartoon talk
I’m a boy. My energy comes from food.
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I’m a robot. My energy comes from electricity.
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What’s in Hi’s hands
What are Hi and Lo talking about
Where does Lo’s energy come from
What’s the weather like in the cartoon
What will this unit probably be about
A chicken leg and an ice cream.
Where their energy comes from.
Electricity.
It’s rainy.
Electricity.
What do you know about …
A1 Do you know these things What can they do
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A2 What common points are there among them
They all use electricity.
They change electricity into other forms of energy.
A3 What forms of energy can they change
electricity into
light energy
heat energy
moving energy
sound energy
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B We can change electricity into different kinds
of energy. Match the kinds of energy in the box with the things in the pictures. Some things may have more than one kind of energy. The first one has been done for you.
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heat energy moving energy
light energy sound energy
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sound energy
sound energy
heat energy
light & sound energy
light energy
moving & sound energy
moving energy
heat energy
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B You will watch three short clips of video.
At the end of each clip, you will see a question. Watch each clip carefully and try to answer the questions. Try to remember every item appeared in the video.
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Before you read
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A Answer the following questions.
What is energy
How do you feel if you do not have energy
If you do not have a lot of energy, what can you do to increase your level
What happens if a machine does not have energy
How can we supply machines with energy
The power that makes things work.
Tired or sleepy.
Rest, sleep, eat healthy food and exercise regularly.
It doesn’t work.
Plug them into an electric socket; use batteries or solar panels.
B1 Before you read the story on the next page,
look at the title, the first and last two paragraphs and the pictures.
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One evening, Daisy said, ‘I’m going to buy a packet of sweets. Does anyone want anything ’
Benny, Daisy’s brother, said, ‘Yes. Can you get me a packet of electricity, please ’
Daisy asked, ‘Didn’t you know that, Benny ’
Mum said, ‘Who’s looking foolish now, Benny ’
The first two paragraphs
The last two paragraphs
B2 Now, try to answer these questions.
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What did the girl want to buy
Who is looking foolish
Who or what is the servant in the title
(A servant usually means someone who does housework for others.)
Why is the servant in the title dangerous
A packet of sweets.
Benny.
Electricity.
If not used carefully, electricity can hurt us.
Read
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One evening, Daisy said, ‘I’m going to buy a packet of sweets. Does anyone want anything ’
Benny, Daisy’s brother, said, ‘Yes. Can you get me a packet of electricity, please ’
Daisy said, ‘OK,’ and went out. Benny laughed, ‘Ha! Ha! I’ve tricked Daisy at last. She doesn’t even know what electricity is. She thinks that she can buy it in packets, like sweets! She’ll really look foolish.’
Mum said, ‘Do you know what electricity is ’
Benny said, ‘Yes. Electricity flows through a wire. A meter measures the amount you use, and you get a bill for it monthly. It’s like water,
in a way.’
‘That’s not a bad explanation,’ said Dad,
‘although electricity is much more dangerous
than water. Electricity is a good servant,
but a dangerous one. You must always
be careful with it. Can you tell me what it
looks like ’
Benny scratched his head.
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Dad said, ‘Nobody’s ever seen electricity. It’s invisible.
But we can change it into different forms of energy that we can see, hear or feel. Can you think of an example ’
Benny said, ‘Light! The light in a light bulb.’
Mum said, ‘That’s right. Do you know where electricity comes from ’
Benny said, ‘Well, it comes into our flat through thin wires, and these are connected to thick wires that are buried under the street.’
‘We call the thick wires cables,’ said Dad. ‘What are they connected
to ’
‘A power station,’ said Benny.
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Daisy then came back. Benny asked politely, ‘May I
have my packet of electricity, please ’ There was a grin on his face.
‘Yes, you may,’ said Daisy. ‘Here it is.’
Benny said, ‘But these are batteries!’
Daisy said, ‘That’s right.’
‘But … but …,’ said Benny.
‘Daisy’s right,’ said Dad. ‘They’re packets that contain electricity. The chemicals inside produce electricity.’
Daisy asked, ‘Didn’t you know that, Benny ’
Mum said, ‘Who’s looking foolish now, Benny ’
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