24
Join the beginnings (1-6) and ends (a-f)
1. Semiconductors occupy a place
between
A.
conductors of the electric
current and non-conductors.
2. Semiconductors are sensitive to
B.
less effectively than metals.
3. Semiconductors convert heat into
C.
heat and light.
4. Great possibilities for various uses of
semiconductors are connected with
D.
into
electricity
without
machines.
5. Semiconductors conduct electricity
E.
its conductivity increases as well
6. As a semiconductor is heated
F.
dependence of conductivity on
heat and light.
Study the following questions, read the text again and highlight or
underline relevant information for giving an answer
1.
What materials are there in electrical engineering?
2.
According to what has this classification been made?
3.
What are conductors?
4.
How many valence electrons do conductors have?
5.
What metals are considered good conductors?
6.
What are the most important properties of copper?
7.
What is copper used for?
8.
Tell about silver and aluminium.
9.
Why is aluminium used for open wire lines?
10. What is an insulator?
11. Name some insulators.
12. What are semiconductors?
13. What is the difference between conductors and semiconductors
regarding total conductivity?
14. What are semiconductors used for?
Grammar
Look through the text about conductivity of materials again. What
tenses are used in the text? Underline all examples of passive verb forms
Put each verb in brackets into active or passive verb form
The discovery of superconductivity
Superconductivity 1. _____(discover) in 1911 by the Dutch physicist
Heike Kamerlingh Onnes; he 2. _______(award) the Nobel Prize for Physics in
1913 for his low-temperature research. Kamerlingh Onnes 3. ______(find) that
