Electronics

Question 1

Mass

Answer 1

Amount of matter in an object

Question 2

Electricity

Answer 2

Invisible power carried by wires

Question 3

Magnetic lines of flux

Answer 3

Move from north to south
Continuous
Never Cross each other
Pass through all materials

Question 4

Bread board

Answer 4

Used for temporary circuits

Question 5

Left hand rule

Answer 5

Forefinger points in the direction of the field

Second hand points in the direction of current
Thumb points in direction of force

Question 6

How electricity is made

Answer 6

Pressure
Heat
Magnetism
Light
Friction

Question 7

Types of current

Answer 7

Non renewable (fossil fuels)
Renewable (clean energy)

Question 8

Ac and DC

Answer 8

DC: produced in batteries , static and lightning

AC: electricity that you get from power points

Question 9

Free electrons

Answer 9

Move freely from one aton to another

Question 10

Conductors

Answer 10

Materials that allow the flow of current

Question 11

Insulators

Answer 11

Materials like glass rubber are called insulators. They resist flow of electricity

Question 12

Semiconductors

Answer 12

Materials that allow and resist flow of current

Question 13

Ionic bonding

Answer 13

Electrons are completely transferred from one atom to another

Question 14

P type semicindictor

Answer 14

Adding impurity atoms to silicon that has only one three valence electrons

Question 15

Resistors

Answer 15

Fixed resistors
Variable
Potentionetor
Thermistor
Photoresistors

Question 16

Forward bias

Answer 16

Applied voltage moves from positive to negative

Question 17

Reverse bias

Answer 17

When applied voltage moves from negative to positive

Question 18

Led

Answer 18

Lights up when current is passed through it

Used in HiFi equipment

Question 19

Zener diode

Answer 19

Reverse bias

Used in regulation

Question 20

Varactor

Answer 20

Reverse bias

Used in tuning circuits

Question 21

Photo diodes

Answer 21

Reverse bias

Used in light sensitive circuits

Question 22

Restricted

Answer 22

Not allowed without permission

Question 23

Earth

Answer 23

Yellow . green

Question 24

Live

Answer 24

Brown

Question 25

Neutral

Answer 25

Blue

Question 26

Effects of electrical shock

Answer 26

Muscles tighten Breathing stops Lungs tighten

Question 27

How to free a victim from shock

Answer 27

Dont touch a victim Turn off the power Use an insulator to free victim Keep victim lying down

Question 28

Why should we test appliances

Answer 28

Establish whether: Current flow exists Ac or DC force Measure the value

Question 29

Digital meter

Answer 29

LCD display More expensive Mostly accurate

Question 30

Analogue

Answer 30

Uses a needle as pointer Not as accurate Cheaper

Question 31

Care for your instruments

Answer 31

Replace battery when low Remove battery if you leave instruments for more than a month Don't connect circuits to live circuits

Question 32

What happens if you don't take care of instrumwnts

Answer 32

Electrical shock Injury Death Damage to property

Question 33

Inspesct instruments

Answer 33

Breakage Wear Signs of overheating Loose fixtures

Question 34

Hazards can harm

Answer 34

People Property Processes

Question 35

Soldering tools

Answer 35

``` Soldering iron Solder sucker Wire stripper Long nose plier Jewellers screwdrivers ```

Question 36

Dry joint

Answer 36

A point that hasn't been soldered properly

Question 37

Contamination

Answer 37

To make something dirty or dangerous

Question 38

Oxidation

Answer 38

Rusting caused by water, chemicals and oxygen

Question 39

Planning a sequence

Answer 39

``` Identify Prepare Do it Assess or evaluate Complete ```

Question 40

Simple circuit to work

Answer 40

Source of electrical potential Conductive path Electrical resistor

Question 41

Pcb

Answer 41

Printed circuit board

Question 42

Simple circuits

Answer 42

Flipflop light Running led Doorbell

Question 43

What makes a plc

Answer 43

Input and Output Microprocessor Power supply Memory

Question 44

Groups of field devices

Answer 44

Motherboards System drives Bus devices Peripherals

Question 45

Red Yellow Green

Answer 45

Off No program Run

Question 46

FM

Answer 46

Frequency modulation

Question 47

Network

Answer 47

Bus network Ring network Star network

Question 48

PSTN

Answer 48

Public switched telephone networks

Question 49

PABX

Answer 49

Private automatic branch exchange

Question 50

Crosstalk

Answer 50

One signal affects another nearby signal

Question 51

Multiplexing

Answer 51

Sending two or more message s or signals at the same time using a multiplex system

Question 52

Three main kinds of data

Answer 52

Bus Ring Star