Presentation

Date: 2015-10-07; view: 474.

Introduction

Unit 5 What is a Transistor?

DEVICES

PROCESS VERBS

Word Check

Transfer

Think of other applications of Shape Memory Alloys and explain how they would work. E.g. Air conditioning systems

An electric toaster

An electric iron

etc.

to deform — to change shape

to contract — to get smaller

to expand — to get bigger

to supply — to give, provide

to give off — to transmit into the atmosphere

to warm (up) — to become warm, cf. to heat

to cool (down) — to become cold

to dump — to drop, to empty the contents

to fit — to attach, to fix

a valve — a control which opens and closes

an actuator — a control which activates (something)

a fan — a device which blows out hot or cold air

(properties)

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.

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