- •Basic technical english
- •Introduction 3
- •Introduction
- •Introduction
- •Introduction
- •Introduction
- •Listening
- •1 Presentation
- •2 Controlled Practice
- •3 Transfer
- •4 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •Listening ------------------------------------------------------------------------------
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Presentation
- •Controlled Practice
- •Transfer
- •4 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening -----------------------------------------------------------------------------------
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
- •1 Listening
- •2 Presentation
- •3 Controlled Practice
- •4 Transfer
- •5 Word Check
- •Introduction
Introduction
This unit deals with two aspects of a transistor:
a. the basic raw material — silicon. It explains the properties of this element.
b. the composition of a transistor — it explains how two types of silicon are used to create a transistor:
1. p.type to which boron is added,
2. n-type to which phosphorus is added.
1 Presentation
The electronics engineer described the following:
What is it? It's a solid/liquid/gas
What can it do? It can increase conductivity
It has the ability to conduct electricity
It allows/doesn't allow electricity to flow
What is it used for? It's used for insulating
What is it called? They're called semiconductors
It's known as n-type silicon
It's termed p-type silicon
What is it composed of? It is composed of silicon
It consists of two parts
It is made of germanium
A p-n junction is formed
Where is it? At the top
On the left In the middle On the right
At the bottom
Controlled Practice
Complete the sentences using the language presented above.
A. 1. Silicon circuits________________________________transistors, diodes, resistors and capacitors.
2. The capacitor________________________________storing the electrical signal.
3. The capacitor ________________________________two conductors separated by an insulator.
4. Capacitors, which __________ sometimes __________ condensers, can store electrical signal.
5. Diodes __________ electricity to flow in one direction. They__________
__________electricity to flow in the other.
Transfer
PAIRWORK - GUESS WHAT IT IS
Student B: Turn to Key Section.
Student A: Think of an object (e.g. desk, telephone, light bulb, TV, etc.) and ask Student В to identify it by asking a series of questions, such as:
What is it?
What can it do?
What is it used for?
What is it composed of?
Student В now thinks of an object and the roles are reversed.
Note: Do not ask what it is called. You must decide from the description.
4 Word Check
PROPERTIES
solid — a substance that is hard, cf. liquid and gas
conductivity — the ability to let electric current flow
to conduct
a conductor
resistance — the ability to stop electric current from flowing (measured in ohms)
insulation — material used to resist the flow of electricity
to insulate
an insulator
an impurity — an additional substance/element found in a pure element
to dope — to add impurities
a dopant — an impurity
COMPOSITION
a substrate — a base material on which parts can be mounted/fixed
contact leads/electrodes — a connection through which electricity can flow
— metal source contact: electric current is introduced into the transistor through this lead
— metal drain contact: electric current is taken out through this lead
— gate electrode: electric current is controlled through this lead.
unit 6 Setting up your new Computer
(instructions - imperatives)