Chapter 2 - Input and Output Devices Flashcards
What are the two different types of keyboards
QWERTY
Ergonomic (used by people who have carpal tunnel syndrome/RSI)
What are 2 uses of keyboards
Input of data into applications software
Typing in commands to the computer
List 3 advantages of keyboards
Fast entry
Easy to use
Easier to do verification checks as data is entered
List 3 disadvantages of keyboards
Difficult to use if user has limited arm/wrist use
Slow method compared to DDE (direct data entry)
Fairly large device that uses up desk space
What is a “Concept keyboard”
Uses icons/phrases instead of standard letters
fast data entry
waterproof keyboard
Where are concept keyboards used
Restaurants
What is a “Numeric keypad”
Enter numbers only
What are 5 uses of numeric keyboards
ATMs (Automatic Teller Machines) Mobile phones POS (Point-of-Sale) terminals Chip and PIN devices Fast entry of numeric data in a spreadsheet
List 2 advantages of numeric keypads
Faster than standard keyboards
Portable
List 2 disadvantages of numeric keypads
Small keys - hard to input
Order of numbers on keypad isn’t intuitive
List 4 uses of a mouse
Opening/closing/minimising software
Grouping/moving/deleting files
Image editing
Controlling position of pointer
List 3 advantages of a mouse
Faster way
Quick way to navigate through applications and internet
Doesn’t require large desk area
List 3 disadvantages of a mouse
Can be difficult if user has restricted hand/wrist movement
Easy to damage
Difficult to use if no flat surface is available
List 2 advantages of touchpads
Same as mouse
Integrated in laptop - no need to carry extra pointing device
List 3 disadvantages of touchpads
Difficult to use for people with limited hand/wrist movement
Difficult to control
Difficult to use (drag and drop)
List 3 uses of trackerballs
Applications where user has disability (RSI)
Used in control room environment - faster
Used in luxury cars
List 5 advantages of trackerballs
Doesn't need same fine control Easier to use if operator is disabled More accurate positioning More robust Less desk space required
List 2 disadvantages of trackerballs
not supplied with computers - more costly
May need training
What is a “Remote control”
Controls operation of other devices remotely using infrared signals
List 3 uses of remote controls
Tv, satellite, DVD
Multimedia
Industrial
List 2 advantages of remote controls
Operated from reasonable distance
Safe to operate
List 2 disadvantages of remote controls
Difficult to use if user has limited hand/wrist movement
Easy to block signal
List 2 uses of a joystick
Video games
Simulators
List 2 advantages of joysticks
Easier than keyboard to navigate
Control is more realistic
What is a disadvantage of a joystick
More difficult to control
List 2 uses of a driving wheel
Video games
Simulators
List 2 advantages of a driving wheel
Easier than keyboard/joystick to control steering movements
Driving experience
List 3 disadvantages of a driving wheel
Expensive
Movements can be too sensitive
Unless it’s an expensive simulator - feedback to the driving wheel is non-existent
List 8 uses of touch screens
Self-service tills ATMs POS PDAs (Personal digital assistants) Public information systems at airports Interactive whiteboards CBT (Computer-based training) output device - can also be flat-screen monitor
List 3 advantages of touch screens
Faster entry of options
Easy method to choose options
User-friendly
List 3 disadvantages of touch screens
Limited number of options
Lead to problem if user has RSI
Screen can get dirty
What is a “Scanner”
Enter information from hard copy into a computer
List 4 uses of scanners
Scan documents
Scan in old/valuable documents - protects originals
Scan photographs
Scan barcodes
List 3 advantages of scanners
Images can be stored for editing
Much faster and more accurate than typing in documents
Possible to recover damaged documents
List 2 disadvantages of scanners
Quality can be limited
Can be slow at scanning
List 4 advantages of digital cameras
Easy to produce good quality photos
Faster to upload
No need to develop film and print out photos
Memory cards can store several hundred photographs
List 4 disadvantages of digital cameras
Computer literate
Artistry lost
Resolution isn’t good
Images need to be compressed to reduce amount of memory used
List 2 advantages of using DV (Digital Video) cameras over traditional video cameras
Easy to manipulate video footage using specialist software
DV format gives higher quality of image
List 4 uses of microphones
Input speech
Input voice recognition
Sensor to pic up sound (alarm system)
Video conferencing or VoIP
List 3 advantages of microphones
Faster to read text
Can manipulate sound in real life
Improving safety if used in voice-activation system
List 2 disadvantages of microphones
Sound files can use up computer memory
Voice recognition isn’t accurate
What are temperature sensors used for
Auto washing machines
central heating systems
automatic glasshouses
Ovens
What are pressure sensors used for
burglar alarm systems
washing machines
robotics
environmental monitoring
What are light sensors used for
automatic glasshouses, automatic doors
burglar alarm systems
street lighting
control
What are sound/acoustic sensors used for
burglar alarm systems monitoring liquid
powder flow in pipes
What are humidity/moisture sensors used for
automatic glasshouses
environmental monitoring
used in factories where
moisture levels are crucial
Where are pH sensors used for
automatic glasshouses
chemical processes
environmental monitoring
List 3 advantages of sensors
Accurate readings
Continuous
Automatic
What is a disadvantage of sensors
Spurious results
List 3 uses of a graphics tablet
Drawings
Input faster than typing
CAD
List 3 advantages of graphics tablet
Possible to modify drawings after input
Accurate
Record pressure
List 5 disadvantages of graphics tablet
Expensive Longer to produce Menus aren't user-friendly Larger drawings Touch screens are damaged easily
List 2 uses of webcams
Personal way of chatting online
Video conference
List 2 advantages of webcams
Left on constantly
Allow people to keep in contact
List 2 disadvantages of webcams
Limited features
Need to be connected to computer
List 2 uses of lightpens
Selecting objects on CRT screen
Drawing on screen
List 3 advantages of lightpens
Greater accuracy
Small
Easy-to-use tech
List 4 disadvantages of lightpens
Lag
Only works on CRT monitors
Bad accuracy
Dated tech
List 2 uses of magnetic stripe readers
Credit cards for ATM
Security device
List 6 advantages of magnetic stripe readers
Fast data entry Error free Secure Prevents access to restricted areas Not affected by oil/water/moisture No moving parts - physically robust
List 3 disadvantages of magnetic stripe readers
If it gets damaged, data is lost
Doesn’t work at a distance
Information isn’t human readable
List 5 advantages of contactless card readers
Faster transaction
The system uses 128-bit encryption to protect data
Customers do not have to worry about typing errors
Retailers no longer have access to the customer’s credit/debit card information
The chip in the contactless credit card responds to the payment terminal reader with a unique number used for that transaction only
List 5 disadvantages of contactless card readers
They are more expensive than normal credit/debit cards
A thief with a suitable reader could monitor your con tactless card transaction
while standing at the counter with you
Can take money twice if the customer uses it as a chip and PIN card
Transactions are usually limited to a small maximum value
Transactions have been carried out without the card holder being aware of this while they were just standing in the payment queue
What is a use of chip and pin readers
Payments
List 2 advantages of chip and pin readers
Secure
Robust
What is a disadvantage of chip and pin readers
Fraud
What is RFID
Radio Frequency Identification Reader
List 4 uses of RFID
Livestock tracking
Retail
Several tags can be read at the same time, thus
speeding up the checkout process
Admission passes
Libraries - no need to scan barcodes or magnetic stripe cards, making the process quicker and more accurate).
List 5 advantages of RFID
No line-of-sight contact is necessary; the tags can be read from a distance
It is a very robust and reliable technology.
Very fast read rate
Bidirectional data transfer
Bulk detection is possible
List 4 disadvantages of RFID
Tag collision (this is when the signals from two or more tags overlap interfering with each other). Because RFID uses radio waves, they are relatively easy to jam or interrup It is relatively easy to hack into the data/signal transmitted by the tag. RFID is more expensive than a comparable barcode system
What is MICR
Magnetic ink character recognition
What is a use of MICR
Process cheques at a bank
List 3 advantages of MICR
Greater security
No manual input - no errors
Magnetic ink can be read if somebody writes over them
List 2 disadvantages of MICR
Only certain characters can be read
More expensive than other methods used in DDE (Direct Data Entry)
What is OMR
Optical Mark Recognition/reader
What is a use of OMR
Read questionnaires/multi choice exam papers
List 3 advantages of OMR
Fast input
Accurate - no typing
More accurate than OCR methods
List 2 disadvantages of OMR
Forms need to be carefully designed to make sure marks are correctly positioned to gather accurate information
Can be problems if forms haven’t been filled correctly
What is OCR
Optical Character Recognition
What is a use of OCR
Processing passports and identity cards
List 2 advantages of OCR
Fast data entry
No manual data entry - no errors
List 2 disadvantages of OCR
Difficulty reading handwriting
Not very accurate technique
List 2 uses of barcode readers
Supermarkets
Libraries
Safety function in companies
List 4 advantages of barcode readers
Faster than keying in data
Records data - safety
Auto stock control
Trusted tech
List 3 disadvantages of barcode readers
Expensive
Not foolproof
Can be easily damaged than RFID tags or magnetic strips
What is QR code
Quick response code
List 2 advantages of QR codes
No need for user to write down/key in website address - auto by scan
Stores website addresses/URLs that appear
What is CRT monitor
Cathode Ray Tube monitor
List 2 uses of CRT monitors
Primary output device
Lightpens
List 2 advantages of CRT monitors
Angle of viewing is better than TFT monitors
Work with light pens
List 4 disadvantages of CRT monitors
Heavy
Run very hot
Consume more power
Flicker - causes headaches
What is TFT monitor
Thin film transistor monitor
List 2 uses of TFT monitors
Primary output device
Integral part of laptop computers
List 3 advantages of TFT monitors
Lightweight
Less glare
Less power consumption
List 2 disadvantages of TFT monitors
Angle of viewing is critical
Definition isn’t as good at CRT monitor
What is LCD monitor
Liquid crystal display/diode
What is LED monitor
Light emitting diode
What is CCFL
Cold Cathode Fluorescent Lamp
What is “Multimedia projectors”
Receive signals that can be analogue or digital
List 3 uses of multimedia projectors
Training presentation
Advertising presentations
Home cinema systems
List 2 advantages of multimedia projectors
Enables people to see presentation rather than crowding around a computer screen
Avoids need for several networked computers
List 3 disadvantages of multimedia projectors
Images may be fuzzy at times
Expensive
Setting up projector can be difficult
What is a “Laser printer”
Produces high quality hard copy output
List 2 uses of laser printers
Used where low noise is requried
Best for fast, high quality, high volume printing
List 3 disadvantages of laser printers
Only fast if several copies are made
Colour are more expensive
Produces ozone and volatile organic compounds
What is an “Inkjet printer”
Produces good quality hard copies
List 3 uses of inkjet printers
Low output volumes are required
Best for high quality printing
3D inkjet printers are now being used in industry to produce protypes
List 4 advantages of inkjet printers
High quality output
Cheaper to buy than laser printers
Lightweight small footprint
Doesn’t produce ozone and volatile organic compounds
List 4 disadvantages of inkjet printers
Slow output if several copies are needed
Can’t do large print jobs
Printing can smudge
Can be expensive
What is a “Dot matrix printer”
Type of impact printer where print head presses against inked ribbon
List 2 uses of dot matrix printers
Noisy environment
Environment where impact printers are of value (producing wage slips)
List 4 advantages of dot matrix printers
Can be used in environments that are dirty (not applicable for inkjet and laser)
Carbon copies/multi-part outputs can be produced
Cheap to run and maintain
Easy to use
List 3 disadvantages of dot matrix printers
Very noisy
Costs more than injket to buy initially
Very slow and poor quality printing
What is a “3-D printer”
Can produce solid objects that actually work
What is the use of “Direct 3-D printing”
Uses inkjet technology
List 5 advantages of 3-D printing
Possible to produce any product a user wants
Manufacture items quickly
Less cost compared to labour and other costs
Medical benefits (prosthetic)
Parts for machinery that can no longer be made can be manufactured using 3D printers
List 3 disadvantages of 3-D printing
Potential to make counterfeit items that infringe others’ copyright
Can create anything with a 3-D printer - dangerous
Job losses
List 3 uses of speakers
Output sound
Play downloaded sound files
Audio output of text on the screen that helps users with disabilities
What is an “Actuator”
Transducers used to take signals from a computer and converts them into some form of motion (motors/pumps/switches/valves)
List 3 uses of an actuator in a motor
Auto washing machines
Control robot arms in industry
Computers to control fans/disk drives/DVD drives
List 2 uses of an actuator in a buzzer
Cookers/ovens
Burglar alarm system
List 2 uses of an actuator in a light
Security lights
Glasshouse to connect lightning conditions
List 4 uses of an actuator in a heater
Auto washing machines to heat up water
Auto control temperature
Control heating in a central heating system
Temperature control in an auto glasshouse
