Scientists at Work

1
Unit 16 Scientists at Work
Welcome
???? ??
2
Alexander Bell
3
Do you know the names of some famous scientist?
What are they famous for?
Einstein
Newton
Darwin
Gravity
Relative theory
Evolution
4
Marie Curie
Franklin
Edison
Radioactivity
Electric Bulb
Kite experiment
5
Mendeleev
Periodic Table of Elements
6
Franklins Famous Kite Experiment
7
Fast reading
Listen to the tape and answer the
following question.
1. Was the experiment done in June 1752
successful?
2. What did this experiment prove?
1.Yes, the experiment was successful.
2. This experiment proved that light- ing and
electricity were the same.
8
True or False

• 1.( ) In 1752 scientists already knew what
  electricity is .
• 2.( ) Franklin conducted the kite experiment in
  sunny days.
• 3.( ) Franklin was helped by a friend to do the
  experiment.
• 4.( ) Franklin made the kite of silk because
  wet silk does not conduct electricity.
• 5.( ) A condenser was used in the experiment to
  store electricity.
• 6.( ) The key tied to the string was put into
  the door to stop the kite from flying away.

T
F
F
F
T
F
9
Place

People Franklin, his ___
son
a shed in the fields
June 1752
Time
the purpose of the experiment
To show the lighting and ________ are the same
electricity
Four things needed for the experiment
Three important steps to prepare for the
experiment
a strong kite, a key, bad weather, a condenser
fix, fasten, tie
10
Discussion

• 1.Why did Benjamin Franklin do this experiment
  with the kite?
• 2.Why is it better to make the kite of silk than
  of paper?
• 3.Do you think Franklins experiment was
  dangerous? Explain.

11
Homework

• Retell the story about
• how Franklin made
• his kite experiment
• and what should be
• paid attention to.