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Scientists at work

Scientists at work

Unit 16

Ancient Greece static electricity

1880 Electrical bulb (Edison)

Television

Computer

1989 World-wide web

Human embryos cloned

Dolly, the sheep, the first cloned

animal

A list of some important Discoveries & Inventions

Static electricity

Edison

Life without electricity

While-reading

Look at the textbook and listen to the tape carefully, then try to complete the following chart.

Task 1

A record of the experiment

Kite Experiment

Franklin and his son

Lightning and electricity are the same.

a kite, a key, some really bad weather and a condenser

In June 1752

Read the text carefully, then do some exercises.

Task 2

Exercise 1

Multiple choice

Franklin made the kite of silk because ______.

wet silk does not conduct electricity

silk kite flies high

silk kite will last longer in weather with rain and strong winds

silk kite is cheaper

C. silk kite will last longer in weather with rain and strong winds

2. Which is not stated but can be inferred from the text?

Franklin did the experiment with the kite.

Franklin’s experiment with electricity was dangerous.

Franklin failed the experiment again.

The experiment was conducted in bad weather.

B. Franklin’s experiment with electricity was dangerous.

3. Which of the following is in the correct order?

①The experiment proves that lightning and electricity are the same.

②The kite flew high in the rainy sky.

③He made a silk kite.

④Very sharp piece of metal was fixed.

⑤A key was fastened to the end of the string.

⑥ A ribbon was tied to the string.

④ ⑤ ⑥ ③ ② ① B. ③ ④ ⑤ ⑥ ② ①

C. ④ ③ ⑤ ⑥ ① ② D. ③ ④ ⑤ ⑥ ① ②

Franklin's Kite Experiment

Instruction

① A small cross of two pieces of light wood.

② Tie the corners of a handkerchief to the points of the cross.

③ Add a tail to the frame.

④ Tie a long string to the cross.

⑤ Fix a sharp piece of metal to the top of the longer stick of the cross.

⑥ Fasten a key to the end of the long string.

⑦ Tie a silk ribbon to the string.

sharp piece of metal

One foot or more

Long string

“cross”

tail

Silk ribbon

Post-reading

Finish the exercise on page 25 in group of four.

Homework

Try to retell the text after class.

Search and Collect more information about your favourite scientist at work on the internet.