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Computers Application Technology > Module 1.2 - Input And Output > Flashcards

Module 1.2 - Input And Output Flashcards

1
Q

What can be classified as input

A

Something that provides the running software with instructions
Data that must be processed

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2
Q

How was picture data gotten onto computers in the past

A

Scanners

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3
Q

What are examples of providing instructions /input to computers

A

Pressing enter to start a new paragraph
Clicking the mouse
Using gesture on a touch screen

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4
Q

What are examples of digital cameras

A

Smartphone cameras
Digital (compact) cameras
Top-end DSLR (digital single-lens reflex)

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5
Q

What is the difference between a point-and-shoot camera and a DSLR camera

A

Point and shoot : cannot change lenses, designed for quick use
DSLR : designed for more ;professional use, can change lenses and have more control over technical settings

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6
Q

What are the advantages of digital cameras

A

Can take many photos
Can see the images immediately
Easily transfer the images you want to a computer
Can record video with sound

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7
Q

What are some disadvantages of digital cameras

A

*disadvantages from the past = may not apply anymore
Cost
Quality
Inability to take photos in low light

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8
Q

Which specifications are typically associated with digital cameras and how do the affect the quality of the camera

A

Lenses - larger lense =more light = better image quality
Sensor size - larger sensor = capture lift more efficiently = better pictures in different light conditions
Optical zoom vs digital zoom - optical zoom uses lenses to get closer to the object = better quality; digital zoom has a magnifying glass effect so the picture gets bigger and bigger until it’s blurry and pixelated
Resolution - total number of pixels that make up a picture
ISO rating - how se sitive camera sensor is to light (how good it can take pics in the dark without flash)

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9
Q

What is a scanner?

A

A scanner is a type of input device that digitizes images and documents and transfers them to a computer.

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10
Q

What is the quality of a scanner determined by?

A

Resolution - dots per inch (dpi) - greater dpi = better quality; higher dpi = larger image file
Colour depth - higher colour depth = larger image file

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11
Q

What is colour depth

A

The number of different colours that can be represented by a pixel

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12
Q

What is the purpose of a scanner

A

To convert images to a format that can be stored digitally

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13
Q

What are the advantages of scanners

A

Large documents collated into single digital file
Electronic copies do no use up space in the office
Scanned copies can be emailed directly
Documents with text can be scanned as images and OCR can be used to convert the images to documents
Old docs and pics can be scanned and stored/shared
Speeding up checkout process in libraries and POS systems
QR codes = quick way to connect to website
Number plates scanned and recorded on e-toll roads

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14
Q

What is biometric input

A

Capturing unique biological features of a person for identification purposes

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15
Q

What are the advantages of biometric input

A

More secure typical user’s passwords
Difficult to defeat biometric security because only authorised person gets access

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16
Q

What are disadvantages/limitations of biometric input

A

Expensive to implement and maintain
Additional hardware and software needed

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17
Q

What input devices are in an ATM computing device

A

Card reader
Modem or network connection
Touch screen
Money counter
Money deposit slot

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18
Q

What are advantages of ATMS

A

Transactions done anytime
Can use facilities of any banks’ atms

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19
Q

What are the disadvantages of ATMs

A

dangerous because when you have cash you become prey for criminals
People can install a skimmer an camera to steal your card details and identity for money

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20
Q

What are barcodes and RFID used for

A

Automatically recognise a product
Barcodes = need barcode scanners to scan barcode
Radio frequency identification tags store data on tag that can be detected wirelessly

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21
Q

What system are barcodes and RFID ah part of

A

Point of sale system

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22
Q

What are the main uses or goals of pos system

A

Faster processing
Better stock control

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23
Q

How do POS systems work

A

Scanners record stock brought into Shop
Data stored in database and price allocated to item
Cashier uses scanner to record items bought (leaving)

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24
Q

What advantages do pos systems have

A

Faster = less time in queue
Prices can be updates and entered with accuracy
Can record exact sales to observe trends and buy stock accordingly

25
Q

What disadvantages does POS system have

A

Offline system = difficult to function
Expensive equipment and software needed

26
Q

How do pen tablet computers work

A

They use special high resolution pen that communicates with the screen wirelessly

27
Q

What are the advantages of a touch screen tablet device

A

Touch screen = more space, no space needed for a physical keyboard
Sense of intimacy and immediacy when directly
Intuitive to use
Allows drawing and gestures as input

28
Q

What are disadvantages or limitations of touch screens

A

Typing on screen is not as fast as using a physical keyboard
The touch screen can become dirty, oily and smudged

29
Q

What are some examples of how dedicated devices collect data

A

Electrical sensors, radio signals, switches, cameras, microphones pressure sensors

30
Q

What are examples of data collection devices

A

Devices used by meter readers
Devices used to monitor a patient’s temperature, heart rate, blood pressure etc
Devices used on weather buoys to collect temp, wind and other weather conditions
Devices monitoring temp, humidity and pressure in environments that need to be carefully controlled and monitored

31
Q

What are advantages of data collection devices

A

Data captured automatically without human intervention
Data captured more accurately
Data captured faster

32
Q

What are disadvantages and limitations of data collection devices

A

Sensors can fail leading to incorrect data being recorded
Only sense or-detectable data can be collected
Can be difficult and expensive to update, expand, repair or replace

33
Q

What are examples of types of input that are in smartphones ad tablets

A

Touch screen - gestures to interact with software
Hardware buttons - control volume, on and off etc
Camera or video camera - take photos or videos
Accelerometer - detect way that device is held for auto rotation and for other apps
Microphone - voice input

34
Q

What made examples of alternative keyboards

A

Virtual keyboards
Virtual keyboards projected by LED light or laser

35
Q

How does wireless technology work in input devices

A

Uses radio waves to connect input device to computing device eg blue tooth
Uses wifi networks to communicate with each other and to connect with devices Th have internet connectivity as a way to gain internet connectivity themselves

36
Q

What is the purpose of an output device

A

Provide feedback
Provide permt results of processing
Transmission of data

37
Q

At do dsplay devices do

A

Display options for user
Display results of processing

38
Q

What are the advantages of display devices

A

Provide immediate feedback
Allow interaction between user and computer
Display content is easily changed and updated
Text can be enlarged for visually impaired

39
Q

What are the types of output we can get

A

Visual - text and images and hardcopy
Sound - sound through speakers and headphones
Touch - vibration of joysticks, phone controller etc and physical copies made by 3D printer
Other - transmission of data between devices and electrical signals

40
Q

What are disadvantages of display devices

A

Out not permanent
Output difficult to share
Can lead to eyestrain and headache
Work is not private
Expensive components
Consumes most electricity/ battery
Difficult to read in bright light
Quality related to size

41
Q

What are the specifications that determine the quality of a display device

A

Screen size
Contrast ratio - number of shades between whitest shite and blackest black
Aspect ratio - ratio between width and height
Lumens for data projector - lumens measure brightness of image they project
Resolution - number of horizontal and vertical pixels that a screen can display; higher = fit more onto screen
Response time - how quickly monitor updates it’s pixels
Other features - range of height and swivel adjustment, viewing angle, built in usb ports, webcam, speakers etc
DVI and HDMI - VGA - DVI - HDMI. Hdmi = transmits high definition video and sound via a single cable

42
Q

What are the two types of printers we get

A

Laser and inkjet

43
Q

What specifications deter one the quality of a printer

A

Speed - pages per minute; laser = faster
Resolution - dots per inch; higher = better quality
Monthly duty cycle - max number of papers that can be printed pm without printer failing
Number of colours - chan, magenta, yellow; more colours = better quality; inkjet = better
Paper options - inkjet paper = better
Connections - connect. Though usb port or media card slots or additional ports

44
Q

Why are laser printers generally better

A

More reliable
Easier to maintain
Better for b&w and general colour
Cheaper to run

45
Q

What are 3D printers

A

Printers that allow you to create physical three dimensional objects from designs that you have created on your computer using CAD or 3D modelling software

46
Q

What is the downside of 3D printers

A

Can be slow, noisy, smelly
Need careful configuration a oontrol

47
Q

Wt can 3D printers create

A

Whole buildings and structures
Mechanical parts
Human body parts and working prosthetics
Tools, clothes, furniture…

48
Q

Which wirelesss] technologies are part of output devices

A

Wireless printing
Sound without wires
Wireless videos and images

49
Q

How does an interactive whiteboard work

A

Normal whiteboard that you can work and draw on using special pens or fingers, they display whatever is on the computer screen

50
Q

What are the advantages of interactive whiteboards

A

Can manipulate computer functions on the board
Allows for better interaction and participation
Notes can be saved on the computer
Helps with visual examples for learners

51
Q

What are the disadvantages of interactive whiteboards

A

Dimly lit venue
Difficult to read if the board is too small
Can’t use normal markers on them
Not affordable
Repairs can be expensive
Teachers scared to use new technologies and training

52
Q

How does the computer control and communicate with input and output devices

A

Driver - software that allows for your computer to communicate with hardware or devices and control them
Plug and play - where operating system automatically detects and configures a device that has been plugged into the computer so that the device can be used almost immediately

53
Q

What are examples of input and output devices for visually impaired

A

Braille keyboard and display device
Magnification devices
Large- key keyboards
Braille printers

54
Q

What are some input and output devices that can help the deaf

A

On-screen notices or flashing screen
Vibration devices

55
Q

What are some input and output devices that help with motor control

A

Eye tracking device
Head movement device
Large-key keyboard
Large trackballs
Foot pedal control devices
Sip and puff devices - suck or blow into straw to control

56
Q

What negative impact can input devices have on our health

A

Sore neck, backache, headache, RSI

57
Q

What negative impact can output devices have on health

A

Eye strain and headache and damaged hearing

58
Q

What are solutions to health issues that could arise from using input and output devices

A

Ergonomically designed equipment

Do not sit for hours on end
Don’t stare fixedly on a screen for long hours
Learn key board shortcuts
Exercises to relieve tension from affected joints
Don’t turn up volume of headphones to drown out surrounding sound
Adjust monitor so there are no glaring reflections and it doesn’t hurt your eyes

Computers Application Technology (5 decks)

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