2. Input and output devices Flashcards

Question

Advantages + disadvantages of magnetic stripes reader

Answer 1

ads: - Simple for people to use. - Cards are inexpensive to make. - Data on the card can be altered. - Security is improved by PIN numbers. disads: - Limited storage for data. - Data can be destroyed by strong magnetic fields. - Not always secure because thieves can read the data on the card.

Answer 2

Use fingerprint and retinal identification. Identify at ATMs to withdraw cash, or register you at schools. Devices capture the biometric data => then passed to a computer for processing and identification.

Answer 3

ads: - Security because only you can confirm your identity - Convenient since no need for passwords. disads: Injuries can lead to false biometrics. Expensive Can be hacked

Answer 4

Consists of a scanner + special software Lets us scan text on paper into a computer Into computer, OCR software converts scanned text into a digital format

Answer 5

ads: - Fast way of entering hard-copy text into a computer - Cheaper than paying an employee to manually re-type printed text into a computer - Avoids typing errors as the process is automatic disads: The system can have difficulty reading handwriting Not 100% accurate Needs to be manually checked for errors -> time consuming

Answer 6

Used in debit cards (chip implanted) - Compare stored info in the card and compare it to the PIN number typed in by user.

Answer 7

hardware devices that allow information to be sent out of a computer system.

Answer 8

a computer monitor produces images on the screen that constantly refresh and change

Answer 9

a printer produces outputs as hard copies on paper.

Answer 10

Stands for ‘cathode ray tube’ Old, bulky, heavy monitors Becoming rare as TFT monitors are replacing them.

Answer 11

Allows users to see outputs from the computer - Used with light pens to allow drawings to be created on screen

Answer 12

ads: - Can be used with light pens to create drawings on screen - Larger range of colours than TFT monitors - Screen angle is better than with TFTs - Cheaper than TFT screens disads: Very large and bulky Create a lot of heat Screen glare makes viewing difficult Need more power than TFTs to operate

Answer 13

Stands for ‘thin film transistor’ Thin flat screened monitors that are commonly seen today Most popular computer screens

Answer 14

Used as screens in laptops, computer, mobile phones

Answer 15

ads: - Lightweight so perfect for portable laptops - Very thin and take up less space - Produce much less glare than CRT - Less power - Emit less radiation - Produce less heat disads: Images can appear unclear when viewed from an angle Lower picture quality Cannot be used with Light Pens yet

Answer 16

Produce high quality hard copy outputs Use toner pressed on a page to produce printed documents Can print large amounts of pages at a very quick rate Work by using a laser beam to ‘draw’ onto a drum

Answer 17

Used in schools, businesses, offices

Answer 18

ads: - Very fast at printing documents - Toner cartridges last a long time - Can handle high volumes of printing - Very quiet - Very high quality - Reliable - Cheaper to run than inkjets disads: - Environmentally unfriendly (produces ozone) - More expensive to buy - Colour laser printers are much more expensive to buy than inkjets - Larger in size compared to other types of printers

Answer 19

Produce high quality hard copies on paper Quality not as good as laser printers, but better than dot matrix Have small amounts of internal memory (RAM) to store print jobs printing slow

Answer 20

Good where few printouts are needed Ideal for single-page, very high quality Often used to print photographs

Answer 21

ads: Output is very high quality Much cheaper to buy than laser printers Smaller than laser printers so take up less space Very quiet whilst printing disads: Slow printing rates Ink cartridges don’t last long, not suitable for large print jobs Expensive to run Printouts can easily smudge if document not left to dry properly

Answer 22

Slow, noisy and produce poor quality outputs - Work by using a set of pins to press an inked ribbon against paper

Answer 23

Very robust and can be used in noisy and dirty environments Used in environments where print speed and noise is not an issue

Answer 24

ads: Work fine in dusty + dirty environments Very cheap to buy and maintain Good for continuous printing disads: Very noisy Very slow Very poor quality

Answer 25

Two types: drum and flatbed Are capable of printing on very large pieces of paper High quality Draw images on page using coloured pens

Answer 26

Used to produce large, accurate drawings like: Blueprints of buildings Maps Giant posters and adverts

Answer 27

ads: Can produce much larger printouts than other printers Print quality is extremely high Can ‘cut out’ designs for use in sign making disads: Print times are very slow Very expensive to buy and maintain

Answer 28

Connected directly to computer/are built into monitor - Speakers are analogue

Answer 29

Output sound from multimedia presentations Home entertainment Can be used by blind people to listen to words on the screen Can be used play downloaded music files

Answer 30

ads: - Everyone in the room can hear the sound - They can help blind people use a computer disads: Output from speakers can disturb people trying to work High quality speakers can be expensive

Answer 31

Project whatever appears on computer monitor onto large screen so a lot of people can view it Controlled using a remote control

Answer 32

Large scale advertising of new products Home cinemas Training presentations

Answer 33

ads: Many people to clearly view the same presentation Enhance the viewer’s experience disads: Lower image quality compared to a computer screen Expensive to buy Cooling fans in the projector are noisy

Answer 34

Advantages Enables fast entry of new text into a document Well tried technology and well known method of entry Most people find them easy to use Easy to do verification check as data is entered, as it appears on the screen simultaneously Disadvantages Users with limited arm/wrist use can find keyboards hard to use Entering data is slow when compared to direct data entry (e.g. Optical mark recognition) They use up desk space as they are quite large

Answer 35

Advantages Enables fast data entry (there is no need to type in whole commands) Waterproof, useful in a restaurant environment They are tamperproof, preventing people from keying in information (which could corrupt the system)

Answer 36

Advantages Faster to select an option by a mouse than a keyboard Enables rapid navigation through applications and the internet Mice are small and don’t take much area Disadvantages People with restricted hand/wrist movement can find it hard to operate a mouse Easily damaged and can easily be clogged up with dirt They are hard to use if there is no flat surface available

Answer 37

Advantages Faster to select an option by a touchpad than a keyboard Enables rapid navigation through applications and the internet Since the touchpad is integrated into the laptop computer, there is no separate mouse, aiding portability They can be used when no flat surfaces are available Disadvantage People with limited hand/wrist movement can find touchpads hard to use It can be more difficult to control the pointer when compared to a mouse They are more difficult when doing operations such as ‘drag and drop’

Answer 38

Advantages Easier to navigate round a screen compared to a keyboard Control is in three dimension Disadvantages More difficult to control the on-screen pointer with a joystick than with other devices such as mice

Answer 39

Advantages Enable faster entry of options than a keyboard or a mouse Very easy to choose options User friendly method for inputting data They are tamperproof, preventing people from keying in information (which could corrupt the system) Disadvantages There is a limited number of options available Using touchscreens often can lead to health problems e.g. (straining of arm muscles and RSI) The screen can get very dirty with constant touching

Answer 40

Advantages Data entry is fast compared with keying in using a keyboard or keypad System is error free, no typing involved Information is secure since there is no typing and the information can’t be read directly by a person Can prevent access to restricted/secure areas Magnetic stripes are unaffected by oil water and moisture No moving parts therefore physically robust Disadvantages If the magnetic stripe is damaged the data is lost Card needs to be in close contact with the reader Since the information is not human readable, they need to find a way to show the information to the customer (e.g. hotel room number not printed on cards)

Answer 41

Advantages Images can be stored for editing at a later date Scanners are much faster and more accurate than typing in documents again It is possible to recover damaged documents and photographs by scanning them and then using appropriate software to produce an acceptable copy Disadvantages The quality can be limited depending on how good the scanner resolution is

Answer 42

Advantages Faster than keying in information, and fewer mistakes are made Used as a way of recording data, can improve safety Barcodes enable automatic stock control Barcode scanning is a tried and trusted technology When an item price is changed, only the central database needs to be updated, there is no need to change the prices individually on each item Disadvantages Barcode scanning is an expensive system to administer since every item in the shops needs a barcode and every barcode needs to be entered on the system. Also there is a need to invest in the computer technology together with staff training, which can all be expensive The system is not fool proof- barcode can be swapped around on items

Answer 43

Advantages A very fast way of inputting results of a survey Since there is no typing, it is more accurate than keying in data OMR is more accurate than OCR Disadvantages Forms need to be carefully designed to make sure that the marks/shadings are correctly positioned to gather accurate information There can be problems if forms aren’t filled correctly, sometimes they have to be checked manually before being read by an OMR, this is both time consuming and expensive

Answer 44

Advantages MICR offers great security than OCR since the oriented characters cannot be altered There is no manual input, thus errors are reduced If somebody writes over the magnetic ink characters it can still be read Disadvantages Only certain characters can be read and the number of different characters is very limited It is a more expensive method than other methods used for direct data entry

Answer 45

Advantages Easier to produce better quality photographs than with a tradition camera Easier and faster to upload photographs to a computer There is no need to develop film and print out photographs (saves paper and no longer needs the chemicals to produce photographs from films) Easy to delete an image from the memory if it’s not satisfactory The memory card can store several hundred photographs Disadvantages The camera user needs to be computer literate to use the camera properly There is some artistry lost since clever software corrects errors in the photographs The resolution is not yet as good as traditional cameras Images often need to be compressed to reduce the amount of memory used It is possible to fill up computer memory very quickly with several photos of the same subject(in order to find the perfect snap shot)

Answer 46

Advantages Can be left on constantly and activated when required Allow people to keep in contact with each other without the need to travel, particularly useful for disabled or elderly people Disadvantages Webcams have limited features and the picture is often of poor quality They need to be connected to a computer

Answer 47

Advantages Faster to read in text than to type it using a keyboard Possible to manipulate sound in real time using special software If used in a voice activation system, this has the advantage of improving safety Disadvantage Sound files can use up a lot of computer memory Voice recognition software isn’t as accurate as typing in manually

Answer 48

Advantages Readings by sensors are more accurate than taken by humans Readings are continuous, there is no break in monitoring Because it is a continuous process any necessary action or warning will be initiated immediately The system can be automatic, removing the need for human intervention, this is particularly important if the process is hazardous Disadvantages Faulty sensors can give spurious results

Answer 49

Advantages It is possible to modify drawings before they are input They offer an accurate method of drawing Disadvantages They are more expensive than other pointing devices

Answer 50

Advantages Light pens are more accurate than touchscreens They are small, so can be used where space is an issue They are easy to use Disadvantages There are problems with lag when drawing on screens Only work with CRT monitors at the moment They are not very accurate when drawing

Answer 51

Hardware devices that allow data to be output from a computer Some hold data temporarily e.g. a monitor Some produce permanent output in the form of a hardcopy e.g. a printer

Answer 52

Advantages Produce higher quality images than TFT monitors Angle of viewing is better than a TFT monitor They work with light pens in CAD and CAM applications (Computer Aided Design/Manufacturing) Disadvantages Tend to be heavy, weight hazard if not supported properly Run very hot, can cause fires if left unattended – especially if they are old Consume more power than TFT monitors They can flicker, this leads to headaches and eyesight problems with prolonged use

Answer 53

Advantages Lightweight, so no weight hazards like CRT monitors Less glare produced than in CRT monitors; also emit less radiation Consume much less power and generate less heat than CRT monitors Disadvantages Angle of viewing is critical, image appears unclear if viewed slightly from the side The definition is sometimes not as good as CRT monitors They cannot yet be used with light pens, so cannot be used in CAD

Answer 54

Advantages Printing is fast for high volumes, slightly faster than inkjet if only a few pages are to be printed Can handle very large print jobs Quality is consistently high Toner cartridges last for a long time; laser printers can be a cost effective option if colour outputs are not required Disadvantages Expensive to buy Only really fast if several copies are being made Colour laser printers tend to be expensive to run since four cartridges are needed as well as diffuser kits, etc. Produce ozone and volatile organic compounds because of their printing method and type of toner/ink used

Answer 55

Advantages High quality output Cheaper to buy than laser printers Very lightweight and take up little space (small footprint) Do not produce ozone and volatile organic compounds, unlike laser printers Disadvantages Output is slow if several copies needed – there is little buffer capacity to store the pages The ink cartridges run out too quickly to be used for large print jobs Printing can smudge if the user is not careful Can be expensive to run if they are used a lot – original ink cartridges are expensive

Answer 56

Advantages Save a lot of money, other methods of making prototypes are very time consuming and expensive The powders used can often be ground up and reused Physical scale models are produced with working parts, which gives a better idea of how the end product will look Disadvantages Expensive to buy Slow at producing their output End product is sometimes a little rough, often further work needs to be done

Answer 57

Advantages Can be used in environments which would be a problem for laser and inkjet printers – dusty, dirty or moist atmospheres Carbon copies or multi-part outputs can be produced Very cheap to run and maintain Easy to use if continuous stationary is required e.g. long print jobs such as wage slips Disadvantages Very noisy – not good in an office environment Cost more than an inkjet printer to buy Very slow Printing is of poor quality

Answer 58

Advantages Can produce huge printouts Print quality is extremely high Disadvantages Slow in operation Expensive to buy and maintain

Answer 59

Advantages Usually long lasting and durable (if operated within their intended power levels) Often provided with the computer/laptop although these may not be the best quality Disadvantages Can take up a lot of desk space, compared to headphones Can distract people around you, everyone can hear what you are playing May not be able to hear the full sound spectrum, this requires multiple speakers

Answer 60

Advantages Enables many people to see a presentation rather than all of them crowded around a small computer screen Avoids the need for several networked computers e.g. when looking at a video clip on the internet, everybody can see the video on the large screen rather than logging on to a number of computers Disadvantages Images can sometimes be fuzzy Expensive to buy Setting up projectors can be a little difficult

Answer 61

Actuators: Transducers that are used to take signals from a computer and convert them into some form of motion e.g. operating motors, pumps, switches and valves Digital signals are sent from the computer to an actuator Motors: Turned on or off by the actuator Buzzers: Switched on or off by the actuator Lights: The actuator is connected to the switch that turns the lights on or off Heaters: Actuators are connected to switches which turn the heater on or off

Answer 62

Hardware that allows data to be entered into a computer.

Answer 63

2 - manual input devices and direct input devices.

Answer 64

A device that allows data to be entered into a computer by hand.

Answer 65

keyboard, numeric keyboard, pointing devices, remote control, joystick, touch screen, scanner, graphics tablet, light pen, microphone, digital camera, web camera

Answer 66

To enter data into applications e.g. word processing applications such as Word. To use enter commands e.g. keyboard short cuts such as CTRL + P to print.

Answer 67

Enables fast entry of text into documents. Very easy to use (you just press the keys) Information instantly appears on the screen so you can check quickly that what you entered is correct.

Answer 68

People with wrist or hand problems can find a keyboard painful to use. Keyboards are quite large and can take up a lot of desk space. Entering data is slow compared with other methods.

Answer 69

Entering numbers into a computer system. Some numeric keypads allow you to enter simple text and symbols. Uses of numeric keypads include: ATM machines, telephones, chip and pin devices.

Answer 70

Faster than using a QWERTY keyboard. They are small so they can fit easily on smaller devices e.g. a phone

Answer 71

People with large hands can find them hard to use. Difficult to enter text information.

Answer 72

Pieces of hardware that are used to control a pointer or curser on a screen. Frequently used with GUI Used to input commands by selecting icons

Answer 73

Mouse Touchpad Trackerball

Answer 74

2 ball mouse - uses a ball under the mouse to detect movement optical mouse - uses reflected light to detect movement

Answer 75

opening, closing, maximising and minimising programmes and files Moving, grouping and deleting files Selecting icons and moving them around the page Editing images

Answer 76

Faster to select icons Very easy to move pointer Small and don’t take up much space

Answer 77

People with wrist problems may find them painful to use Dirt can affect accuracy Need a flat surface to work on

Answer 78

Replacement for a mouse - especially in laptops

Answer 79

easier than using a keyboard built into laptops can be used even when there is no flat surface don’t get clogged with dirt

Answer 80

more difficult to control than a mouse can be painful to use for people with wrist problems drop and drag can be more difficult to perform

Answer 81

similar to mice but the ball is on the top of the device rather than the bottom

Answer 82

Used as an alternative to a mouse Used in arcade gaming machines

Answer 83

People with wrist problems can still use them More accurate than touchpads Can be used when no flat surface is available No limit on ball travel

Answer 84

More expensive than mice More difficult to learn how to use than a mouse

Answer 85

Controlling other devices using infra-red signals e.g. changing the tv channel increasing/decreasing volume on a music player selecting a different chapter on a dvd player operating cranes with heavy activating explosives in demolition operating robot arms in hazardous chemical plants

Answer 86

Devices can be operated without having to go up to them - helpful for people with disabilities Can operate devices in unsafe environments

Answer 87

People with limited hand movement can find them difficult to use The infra red signal between remote and device can become blocked

Answer 88

To control a pointer on a screen (similar to a mouse)

Answer 89

To control a pointer on a screen - the handle moves the pointer the buttons allow us to select or ‘click stuff’

Answer 90

video games industrial machinery simulators

Answer 91

easier to control simple to use and get used to disabled people might be able to use them more easily

Answer 92

Not as accurate as a mouse Can be painful for people with wrist/hand issues Difficult to enter text

Answer 93

Input commands into a computer by touching or pressing buttons/icons on the screen

Answer 94

Mobile/smart phones PDAs Public information systems Interactive whiteboards Multiple choice tests

Answer 95

fast and easy to use no training needed to use them

Answer 96

Limited number of options available on the screen Expensive Screens can become very dirty

Answer 97

To enter information from a hard copy (piece of paper) into a computer

Answer 98

scans hard copies e.g. documents, photographs, certificates etc. into the computer

Answer 99

Very fast to enter hard copies Very easy to scan and store Easy to back up and duplicate Damaged photos can then be repaired using graphic editing software

Answer 100

Images are of lesser quality Scanned images take up a lot of memory space

Answer 101

Allows designers to produce digital images much more accurately Feels like drawing with a pen (the stylus)

Answer 102

Much easier to draw images than with a mouse Very accurate drawings can be produced Fine detail can be added (unlike using a mouse) Can be used where symbols are used instead of text

Answer 103

Very expensive Not able to enter data into a computer this way

Answer 104

Quite old technology used instead of mice, touch screen or graphics tablets Used for drawing directly onto a CRT screen (cathode ray tube)

Answer 105

More accurate than touch screens Very small

Answer 106

Not as accurate as a graphics tablet Can only be used with CRT screens Can be uncomfortable to use

Answer 107

Used to input analogue sound into a digital computer

Answer 108

Narration Voice over Speaking over the internet using VoIP e.g. Skype video conferencing Converting speech to text Hands free mobile phones

Answer 109

Faster to input words than typing using a keyboard Able to be used by disabled people who cannot use their hands Makes driving safer Very cheap to buy

Answer 110

Sound files take up a lot of storage space Not as accurate as typing Background noise can interfere

Answer 111

Take photographs and digitally store them on a memory card Preview photos and discard unwanted ones Capture sound as well as picture

Answer 112

Save special moments Gather images for use in presentations Transfer images to a computer for editing Print images easily

Answer 113

No film to develop Unwanted images can easily be deleted Easy to make copies of images No need to print Can store thousands of pictures Can be easily transferred Can be easily edited

Answer 114

\need to have computer skills to use Artistry can be lost - camera automtically corrects to what it thinks you want

Answer 115

Very similar to digital cameras but are directly connected to a computer and do not have memory storage Used in face to face conferences such as Skype

Answer 116

Allow long distance face to face conversations Allow cheaper interviews and business meetings to take place Can allow parents to keep an eye on their children from a different location Can be used as as security device as can be left running constantly

Answer 117

Image quality can be poor Permanently fixed to computing device Usually fixed so can’t move around

Answer 118

Device with little or no human input needed.

Answer 119

magnetic stripe reader chip and pin reader barcode reader optical marker reader (OMR) optical character reader (OCR) Magnetic Ink Character Recognition (MIRC)

Answer 120

ATM reader of bank cards EFTPOS for transferring customer money Hotel room keys

Answer 121

Very fast No typing involved - therefore no errors Not affected by water and are robust Cannot be read by the eye so details on card are safe

Answer 122

Can only hold a small amount of data Need to have contact between the reader and card to work - cannot be used over the internet If damaged all data is lost Can be easily duplicated - cloning

Answer 123

To make secure payments

Answer 124

More secure than magnetic stripe readers Information is harder t clone Can hold more data than magnetic stripe Readers are portable

Answer 125

Might forget the PIN People can look over shoulder and copy PIN if card was stolen

Answer 126

Read information stored on a products bar code e.g. product Id number, manufacturer, country of origin

Answer 127

Quick and easy to change product prices Quick and easy to get info onto a system Very accurate Automatic stock control

Answer 128

Expensive way to gather info Bar codes can be swapped Damaged bar codes can’t be read

Answer 129

Reads marks made with a pencil, e.g. lottery ticket, multiple choice exams

Answer 130

Quick Accurate Can save money

Answer 131

Cannot be read if filled in incorrectly Can only read shaded areas Forms can jam

Answer 132

Can scan text on a paper into a computer. Converts scanned text to a digital format. e.g. processing passports

Answer 133

Very fast Cheaper Avoids typing errors

Answer 134

Can find handwriting difficult to read Not 100% accurate Need to check errors manually

Answer 135

MIRC can read special ink e.g. customer cheques

Answer 136

Process cheques quickly Greater security Less errors as not manual input Info can still be read even if someone writes over it

Answer 137

Only a limited number of characters can be read More expensive than other methods

Answer 138

A device that automatically inputs data into a computer system, where the data is constantly changing and can be measured.

Answer 139

Measuring: Temperature Pressure Light Sound Humidity/moisture pH

Answer 140

Readings taken are more accurate Sensors monitor constantly Sensors respond to information immediately (burglar alarms) No need of humans to operate sensor

Answer 141

Faulty sensors can give incorrect results e.g. reverse parking sensors

Answer 142

Hardware devices that allow information to be sent out of a computer system - show the results of processing

Answer 143

instantly see outputs - monitor screen

Answer 144

Can be used with a light pen Produce a large range of colours Have a good screen angle Cheaper than other options

Answer 145

Large and bulky Create a lot of heat Have a lot of screen glare Use more power and therefore are more expensive to run

Answer 146

instantly see outputs - monitor screen - thin, flat screen

Answer 147

Lightweight Very thin Less glare Uses less power Emits less radiation Emits less heat

Answer 148

Images can be unclear Lower picture quality Cannot be used with light pens

Answer 149

Use toner pressed onto a page to produce printed documents. Can print large amounts at a very quick rate. Popular in schools, businesses and offices

Answer 150

Very fast at printing documents Toner cartridges last a long time Can handle high volumes of printing Very quiet when printing Very high quality print outs Reliable Cheaper to run than other printers

Answer 151

Environmentally unfriendly - produce ozone, use more power than inkjets Laser printers are more expensive to buy Larger in size

Answer 152

Produce high quality hard copies via an ink cartridge.

Answer 153

Out put is high quality cheaper than laser printers smaller than laser printers Do not produce ozone Quiet when printing

Answer 154

Slow printing rates Ink cartridges don’t last long Can be expensive to run Printouts can easily smudge

Answer 155

Produces an imprint on the paper by pins being pressed against an ink ribbon.

Answer 156

Work in environments where other printers might break Carbon copies can be made Very cheap Good for continuous printing

Answer 157

Very noisy Very slow Very poor print quality

Answer 158

Produce hard copies on very large pieces of paper by using a flatbed or a drum, e.g. blue prints

Answer 159

Produce much larger printouts Print quality is extremely high Can cut out designs for sign making

Answer 160

Very slow Very expensive

Answer 161

Produce sound - e.g listen to music, audio for films Can be analogue or digital (uses a sound card) Alters the volume of sounds

Answer 162

Everyone in the room can hear Blind people can use the computer

Answer 163

Output can disturb people High quality speakers can be expensive

Answer 164

Project whatever appears on a computer monitor onto a very large screen

Answer 165

Many people can see the same presentation Enhances the viewers experience

Answer 166

Lower image quality Expensive to buy Cooling fans are noisy

Answer 167

Need little training, a skilled typist can enter data very quickly and often computers come with a keyboard supplied

Answer 168

It is prone to human error since all data has to be keyed in, if you cannot touch type it can be time consuming to enter data and excessive use can lead to RSI.

Answer 169

Repetitive Strain Injury

Answer 170

A ‘pointing device’

Answer 171

Infrared, mouse ball and wireless

Answer 172

Easy to use, inexpensive and designed to fit under the human hand.

Answer 173

Experienced users may find using a mouse slow, compared to using hot keys such as Crtl + P to print

Answer 174

Playing flight simulators

Answer 175

It senses movements and converts them into coordinates.

Answer 176

It has a range of buttons that can carry out specific, pre-programmed actions

Answer 177

Provides a better experience when playing a flight simulator

Answer 178

Can break easily, if too much force is used to manoeuvre it

Answer 179

It senses touch from a finger (it is touch sensitive)

Answer 180

A mouse for a laptop

Answer 181

Useful for laptops when using a mouse is not practical

Answer 182

An LCD screen

Answer 183

Cannot be used while wearing gloves, for example in a sterilised environment, and it may not always accurately interpret a user’s movement.

Answer 184

In a fast food restaurant for inputting a customer’s order

Answer 185

No additional hardware such as a keyboard or mouse is required

Answer 186

Voice recognition is useful to users with limited mobility, who can use their voice instead of a keyboard.

Answer 187

Background noise can interfere with spoken words, making it harder to use voice recognition applications. Software can also interpret spoken words incorrectly.

Answer 188

Optical Character Recognition

Answer 189

It converts written words on paper into text that can be edited on a word processor.

Answer 190

Flatbed scanner

Answer 191

Very accurate and can produce high quality images, and once digitised, images can be enhanced with a graphics application

Answer 192

Images lose some quality during the scanning and digitising process, and images can take up a lot of memory space.

Answer 193

A memory card and LCD screen

Answer 194

One million pixels

Answer 195

Images taken can be viewed on the LCD immediately, and images can be edited and enlarged

Answer 196

They are generally more expensive than cameras which use film, and images often have to be compressed to avoid using too much memory.

Answer 197

Uses radio waves to read and capture information stored in a tag

Answer 198

Advantages -No line of sight needed -Robust and reliable -Fast read rate -Bulk detection -Bidirectional data transfer Disadvantages -Tag collision -Can be jammed easily -Easy to hack -More expensive then barcode system

Answer 199

-Live stock tracking -Retail -Admission passes -Libraries

Answer 200

Test on hard copies to electronic form

Answer 201

-Processing identity cards -Hard copy documents to electronic -ANPR(Automatic number plate recognition) -Digitalizing old documents

Answer 202

-Supermarkets -Libraries -Safety in companies (electrical equipment)

Answer 203

Advantages -Fast if printing multiple complies -Handles large print jobs -High quality -Toner cartridges last long Disadvantages -Expensive to run -Produce ozone

Answer 204

Advantages -Good quality -Cheaper to buy -Light weight -Doesn’t produce ozone Disadvantages -Slow -Expensive if used a lot -Printing can be smudged -Can’t do large print jobs

Answer 205

Advantages -Very cheap to run and maintain -Easy to use Disadvantages -Loud -High initial price -Slow -Poor quality

Answer 206

DAC(Digital to analogue converter) Passed through amplifier Electric current converted to sound

Answer 207

Hardware devices that allow data to be entered into a computer

Answer 208

Manual input devices Direct input devices

Answer 209

Data is input into the computer by hand (people have to do most of the work).

Answer 210

Text, numbers and instructions Used to input data into applications Used to enter commands into the computer.

Answer 211

Used to enter numbers into a computer system - Used in: ATMs, telephones, chip and pin devices

Answer 212

Used to control a cursor on a screen. Mice: Opening, closing, maximising and minimising programs and files Moving, grouping and deleting files Using applications Touchpad: Replacement of mouse Same uses as mice Tracker ball: Same functions as mice More comfortable to use than mice Some arcade gaming machines use tracker ball’s to control gaming characters on screen.

Answer 213

Used to control other devices using infrared signals Home entertainment systems use remote controls: DVD / Blu-ray players, TV etc. Industry uses remote controls to operate machinery that might be too dangerous to get near to: activating explosives in demolition.

Answer 214

Similar functions to mice and trackballs. Can control characters or objects in video games Can control industrial machinery Used in simulators.

Answer 215

Input commands into a computer by pressing or touching buttons / icons on the screen. Users can touch or press icons on the screen removes the need to use a mouse. Mobile phones and PDAs use touch screens. Interactive whiteboards in schools.

Answer 216

Used to enter information on paper into a computer. Reflects light off the hard copy in order to capture an analogue image of the document then converts it to digital format. E.g. old photograph (analogue) -> scanner converts photo into digital data -> digital data can be stored on a computer.

Answer 217

Used by artists and designers to easily create and store digital graphics in a computer Whatever is drawn onto tablet can be seen on a computer screen. Allow designers to produce digital images much more accurately than if they were using a mouse.

Answer 218

Used by directly drawing or selecting icons on a computer screen. Works by: Picking up light from the computer screen + signaling to the computer exactly where light picked up

Answer 219

Used to input analogue sounds into a digital computer. Used in voice recognition software. Used in gaming so that gamers can talk to each other.

Answer 220

Store digital photographs on a memory card. Built-in screen to allow for previewing Capture video and sound Exists in almost all modern mobile phones.

Answer 221

Used to conduct face-to-face conversations such as Skype. Video-conferencing Capture image and video content Alternative to security cameras.

Answer 222

Data is input into the computer directly by a machine / device.

Answer 223

Reads and outputs printed barcodes to a computer. - Used in supermarkets, stores

Answer 224

ads: - Quick & easy to change products price (all digital) - Easy to get info on system (only have to scan) - Automatic stock control. - Very accurate->no typing disads: - Expensive(each item needs a barcode / computer technology / database needed) - Can only read undamaged barcodes - Barcodes can be swapped.

Answer 225

Captures human-marked data - Often used to read multiple choice examinations where students shade in areas they think are correct.

Answer 226

ads: - Very fast method of marking because it is automatic. - Accurate because it automatically transfers data. - Can save money from employing people disads: Forms need to be accurately designed. Can only read shaded areas. If forms are filled incorrectly, they cannot be read.

Answer 227

Read information printed in a special ink, then convert it into form that computer can understand. Write customer account numbers on cheques.

Answer 228

ads: - Cheques can be processed very quickly. - Special ink characters cannot be changed, increases security. - No manual inputs -> less errors. disads: Only limited characters can be read. More expensive than other devices.

Answer 229

Read magnetics stripes that are found on back of credit cards, loyalty cards etc. Magnetic strips contain the user’s personal details such as account no, and name.

Answer 230