arntech security - technical training series 1 complete

Technical Training:

Series 1

ARNTECH SECURITY

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Arntech Security Technical Training Series 1 / Page 1

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HOW TO USE THIS WORKBOOK

Working through this workbook will equip you with a basic knowledge of

electricity. We will cover the terms that are used everyday in electrical and

electronics industries, as well as what these terms mean. We will look at how

you can use the concepts you learn here to apply them to your work, and we

will work through practical examples so you can practise what you have learnt

in a safe environment. Then you will have the confidence to solve problems

and make changes in your working environment. This will make you a valued

employee, who will be trusted more and more, and with more responsibility

comes a better salary. So, feel free to ask questions as we work through the

information and make sure that you understand each step of the way. This

training is to empower you, so use the opportunity to really learn from this

course.

There are four lessons in this series; the first two lessons will be the theory of

electricity and electronics, lesson three will be practical application of that

theory as we try out different experiments and work with circuits, and the

fourth lesson covers how this theory is applied in industry. As you start with

Lesson 1 and 2, make sure you understand it all, before continuing with the

more practical lessons 3 and 4.

The best way to study

To make sure that you get the full benefit of this series, we recommend that

you do the following:

Read the section at the beginning of every chapter carefully. It provides

you with the learning outcomes for each of the lessons in this workbook.

The learning outcome is the knowledge that you need to have by the time

you have finished the lesson.

Carefully and diligently work through each lesson, keeping in mind the

outcomes that you have to achieve.

Make sure that you complete all the activities in the lessons.

Make sure that you answer all the self-assessment questions in the

lessons. Compare your answers to those provided in this workbook.

If you encounter any words that you do not understand, make a list of

these, and then either look up their meanings in a dictionary or ask your

tutor for their meanings.

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The symbols used in this workbook

We use symbols throughout this workbook to make it easy for you to see what

type of information follows. Read through the descriptions of symbols below,

and look out for them as you work through the workbook.

Icon Description

Specific outcomes and assessment criteria: This shows the specific outcomes of

the session, and the assessment criteria for these outcomes. You must be able to

show that you understand and can demonstrate these outcomes after you have

worked through the workbook. It is on this knowledge that you will be assessed.

Definition: This shows an important definition of a term that you should understand

and remember.

Important statement: This shows an important concept that you must understand

before you continue with the rest of the lesson.

Activity: This shows an activity that you need to do as part of your learning.

Self-assessment questions: This signals the questions that will help you to analyse

your understanding of the theory that was covered in the lesson. We end each lesson

with a set of self-assessment questions.

Answers to self-assessment questions: This signals the suggested answers to the

self-assessment questions. Please do not look at the answers before you have tried to

answer the questions yourself.

Competence checklist: This signals a checklist to help you discover whether you can

meet all the assessment criteria in the lesson.

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Specific Outcomes and Assessment Criteria

After you have worked through the content covered in this workbook, you should be

able to do all the tasks we have listed as outcomes below:

Specific Outcome 1: Understanding the basic concepts of current electricity in

both a practical and theoretical manner.

1.1 Understand what charge is and how it is formed.

1.2 Explain the concept of electricity.

1.3 Explain potential difference: what is it and how it affects current flow.

1.4 Understand conductors and insulators.

1.5 Differentiate between AC and DC current.

1.6 Learn how to work with electricity safely.

Specific Outcome 2: Understanding what circuits are composed of, and how

each part affects the flow of electricity.

2.1 Be able to identify various components on a circuit board.

2.2 Know the units used to measure different circuit elements.

2.3 Be able to calculate unknown measurements using known measurements.

2.4 Understand Ohm’s Law, and be able to calculate any of the variables.

2.5 Understand the effects of connecting cells and resistors in series and in parallel.

Specific Outcome 3: Understand the uses of electricity in some houses.

3.1 Understand AC current, as compared to DC current.

3.2 Know how fuses work and why we use them.

3.3 Gain a general understanding of electromagnets.

3.4 Compare the differences between AC and DC motors.

3.5 Explain how a light bulb works.

Specific Outcome 4: Know how different electronic devices are used.

4.1 Know what role is played by the following electronic devices:

Inductors, Capacitors, Transformers, Rectifiers, Diodes, Regulators,

Relays, Transmitters, Receivers

4.2 Know which device is required to complete a specific function.

4.3 Be able to identify the devices in a practical application.

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LESSON 1: BASIC CONCEPTS OF ELECTRICITY.

When you have worked through Lesson 1, you should be able to:

Understand the basic concepts of current electricity in both a practical

and theoretical manner.

To prove that you have achieved the outcome of this lesson, you must be able to do

the following:

1.1 Understand what charge is and how it is formed.

1.2 Explain the concept of electricity.

1.3 Explain potential difference: what is it and how it affects current flow.

1.4 Understand conductors and insulators.

1.5 Differentiate between AC and DC current.

1.6 Learn how to work with electricity safely.

At the end of this lesson, you will be able to explain how electrical charge is

created by removing electrons from some atoms forming positively charged

ions, and by some atoms attracting electrons forming negatively charged ions.

You will see that in areas where an electric field force is exerted on a charge,

the charges will move by either being attracted to each other, or repelling each

other.

You will see how a potential difference of charge is built up, and how electrons

then move from an area of high electron concentration to an area of low

electron concentration. This movement happens along a conductor and is

known as electricity. Various substances allow electrons to flow through them

easily and are known as conductors, whereas other substances don’t allow

electrons to flow through them and are known as insulators.

You will find out more about the two different types of electricity, static

electricity and current electricity, and you will learn to differentiate between

the two types of current electricity that we use in our daily lives. These two

types are AC and DC current and it is important that you are able to

understand the differences between the two. You will finish off with reminders

on how to work with electricity safely, to prevent any nasty accidents.

We've provided you with a check-your-competence checkbox to tick at the end

of this lesson. When you tick the assessment criteria, you'll see what you've

achieved in this lesson!

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Introduction

Electricity is all about moving charge. In order to understand electricity better,

we need to understand what charge is, and how it is created. In this lesson,

we will look at the concepts of charge and current under the following

headings:

Charge – what is it and how is it formed?

Electric fields and how they act as a force on charge.

Electricity – what is it and what different types do we find?

Working with electricity safely.

You are in an industry where you work with electricity all the time. It is

important that you fully understand the basic concepts of electricity, in order

to apply this knowledge when you are solving more complex electrical

problems.

Let’s start by defining charge, the core concept to understanding electricity,

and then moving on to electricity itself.

Charge – what is it and how is it formed?

All matter is made up of atoms, and atoms in turn are made up of smaller

particles known as protons, neutrons and electrons. These sub-atomic

particles have different charges: protons have positive (+) electrical charge,

electrons have negative (-) electrical charge, and neutrons have no overall

charge. I am sure you have all seen this type of characteristic picture of an

atom:

Figure 1: An atom showing the nucleus and the electrons orbiting around the

nucleus.

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arntech security - technical training series 1 complete

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