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ICT > 2.1 : More about input devices > Flashcards

2.1 : More about input devices Flashcards

1
Q

what are the tow different types of input devices?

A
  • manual input device

- direct input devices

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2
Q

what is meant by manual input device ?

A
  • data is input in the computer by hand ( people do most of the work )
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3
Q

what is meant by direct input devices ?

A
  • Data is input into the computer directly by a machine / device ( there is minimal input by people )
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4
Q

what are the uses of a keyboard ?

A
  • it is used to input :
  • text
  • numbers
  • instructions
    other uses :
  • inputting data into a application software like word , excel
  • typing in commands like CTRL + C for copy
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5
Q

what are the advantages of keyboards in general ?

A
  • easy and familiar to use

- fast entry of text into a document

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6
Q

what are the disadvantages of keyboards in general ?

A
  • slow method when compared to direct data entry
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7
Q

from where does the QWERTY name come ?

A
  • from the first 6 letters form the top row of alphabet keys in a QWERTY keyboard
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8
Q

what are the sections of a QWERTY keyboard ?

A
  • alphabet keys
  • function keys ( F1 ,F2 , F3,etc.)
  • arrow keys
  • number keys one is a nuemeric pad and the others are above the alphabet keys)
  • command keys ( Delete , insert , end , page up and page down ,etc.)
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9
Q

what can a QWERTY keyboard keys cause of used for long period of time ?

A
  • can cause health problems such as reptetive strain injury ( RSI)
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10
Q

what are ergonomic keyboards?

A

they are special keyboards that has been developed to overcome RSI , they are supposed to put your hands in a more natural position than traditional keyboards , their natural shape and they have a built-in handrest

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11
Q

what are concept keyboards ?

A

concept keyboards are flat boards that contains a grid of buttons , each button can be programmed to do whatever you want

an overlay sheet that contains pictures or symbols is placed above the grid so the user can tell what pressing on different areas will do

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12
Q

where is concept keyboards used ?

A
  • in places where there is limited choices to choose from so its faster and more convinient to use concept keyboards , and places that will need u to choose ur choice fast such as fast food resturants
  • mcdonald’s tills uses concept keyboards to make ordering faster and it is used in schools
  • its also comes in handy where if somebody finds it difficult to use a normal keyboard or in places where a normal keyboard will get damaged by water or dust
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13
Q

what are the advantages of concept keyboards ?

A
  • much faster in making non-text selections , such as menus in fast-food outlets
  • the keyboard is waterproof so it can be used where there is dirt or the risk of spillage
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14
Q

what are the disadvantages of concept keyboards ?

A
  • limited to the choices on the keyboard
  • poor for numeric-input or text-input though some of them do include a neumric keypad so the operator can enter the amount sold
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15
Q

what is the use of a numeric keypad ?

A
  • it is used to input data into :
    - ATM
    - POS terminals
    - Chip and Pin
    - mobile phone
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16
Q

what are the advantages of a numeric keypad ?

A
  • straight forward to enter numeric data like pins or price at a POS terminal
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17
Q

what are the disadvantages of a numeric keypad ?

A
  • keys can be too small

- difficult to type in letters ( older mobiles to letters)

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18
Q

what are light pens ?

A
  • they are quite an old technology and is an alternative to mice or touchscreens or graphic tablets
  • used to directly draw or select icons on the screens
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19
Q

How does a light pen work ?

A
  • it works by picking up light from the computer screen and then sending signals to the computer telling exactly from where the light was picked up , this allows the computer to draw on the part of the screen where the pen picked up the light
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20
Q

what are the uses of light pens ?

A
  • it used for selecting icons directly on the screen

- or for drawing directly on the screen

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21
Q

what are the advantages of light pens ?

A
  • they are more accurate than touch screens as the point of the light pen is much thinner than a humans finger end point
  • can be used in places where there is no room for mice or a graphic tablet
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22
Q

what are the disadvantages of light pens ?

A
  • they are not as accurate as graphic tablets when producing drawings
  • they only work on CRT (cathode ray tubes) screens so they cant work on TFT or LCD screens
  • can be quite uncomfortable as your hand has to stay raised while working for long periods
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23
Q

what are the uses of a mouse ?

A
  • to control the pointer on the screen to :
  • selecting windows
  • clicking icons
  • menu options
  • positioning pointer
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24
Q

what are the advantages of a mouse ?

A
  • quicker to select an option when compared to keyboards
  • easy to navigate through menu options compared to
  • small , so it occupies a small space on your desktop
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25
Q

what are the disadvantages of a mouse ?

A
  • it easily damaged
  • needs a flat surface
  • hard to use if user has limited finger or wrist movements
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26
Q

where do we use touchpads ?

A
  • they are used in laptops as a pointing device
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27
Q

what are the advantages of a touchpad ?

A
  • no need for a separate device
  • easy to navigate through compared to a keyboard
  • can be used on the move where there is no flat surface
28
Q

what are the disadvantages of a touchpad ?

A
  • they tend to be used in more cramped up situations which increases the risk of RSI
  • some people find it more difficult to use than a normal mouse
  • they tend to be really difficult in drag and drop situations
  • they are hard if the user has limited wrist or finger movements
29
Q

what are the uses of a trackerball ?

A
  • people with disabilties like people who have problems with wrist mobility
30
Q

what are the advantages of a trackerball ?

A
  • easier to use than a mouse
  • they are stationary only the ball moves
  • faster to navigate through than a mouse
  • more accurate to position the pointer
31
Q

what are the disadvantages of a tracker ball ?

A
  • they tend to be more expensive

- they are not familiar

32
Q

what are the uses of remote controls ?

A
  • its used to control
  • tv channels
  • multimedia system
  • industrial applications
  • menu options
33
Q

what are the advantages of a remote control ?

A
  • it can be used from a distance

- people with disabilities can also use it as it is used from a distance

34
Q

what are the disadvantages of a remote control

A
  • any obstacle or wall or object in the way will block the signal
  • needs batteries to run
  • small buttons which can be pressed by mistake
35
Q

what are the uses of a joystick ?

A

they are used in computer games and simulators

36
Q

what are the advantages of a joystick ?

A
  • they are ideal for quick movements
  • they can be used by people with disabilites as it can be operated by for example the mouth and the foot
  • they are easier to use than a keyboard
37
Q

what are the disadvantages of a joystick ?

A
  • they have to be bough separatly
  • they are harder to enter text as each letter should be picked indivusally
  • more difficult to use compared to a normal mouse
38
Q

what are the uses of a steering / driving wheel ?

A
  • used in simulators

- used in video games ( driving / racing ) games

39
Q

what are the advantages of a steering wheel ?

A
  • feedback can be added to add road resestince
  • just like a real steering wheel
  • feels like a real experience compared to using a keyboard
40
Q

what are the disadvantages of a steering wheel ?

A
  • limited driving applications as movement is limited

- they are expensive and adding force feedback will increase their price

41
Q

where do we use touchscrees ?

A
  • smartphones / tablets
  • POS
  • interactive white boards
42
Q

what are the advantages of touch screens ?

A
  • they are very simple to use
  • they are easier to use standing up when compared to a keyboard
  • faster to select options than other input devices such as mouse or keyboard
  • they are good in limited spaces such as : Smartphones / tablets
  • they are tamper-proof so other data cannot be entered which could corrupt the system
43
Q

what are the disadvantages of touch screens ?

A
  • the screen may get dirty that you cannot see the icons clearly
  • there are some concerns that germs can be transported through multiple people touching the same screens
  • they are more expensive than other input devices such as : keyboard
  • sometime it is too small to see the icons that it displays
  • options may get selected accidently
44
Q

what is the use of a scanner ?

A
  • it is used to scan photographs and documents , thus digtalising them
45
Q

what are the advantages of a scanner ?

A
  • digtilising documents without having to re-type anything
  • restore and repair old images and documents for archive purposes
  • ## digtalising old copies of documents
46
Q

what are the disadvantages of scanners ?

A
  • the copies may take a lot of space on the computer
  • it could take a lot of time until scanning a long document
  • the quality is dependent on the resolution of the scanner
47
Q

what are the uses of a digital camera ?

A
  • they are used to take photographs and small video clips

- data can be transfered to a computer

48
Q

what are the advantages of a digital camera ?

A
  • there is no need to develop film
  • there is no need to use chemicals as there is no need for film
  • images can be easily sent to a computer via e-mail attachments for example
  • photo can be enhanced using special software
  • many photos of the same subject can be taken and the best one is the one chosen
  • photos that are taken can be used for websites or in presentations
  • photos taken can be shared on sharing websites
49
Q

what are the disadvantages of digital phots ?

A
  • the photography may not be as good as the ones which use films as the quality is dependent on the number of pixels
  • a photographer needs some computer skills to produce the best image
  • the process of transferring data from the camera to the computer can be complicated
50
Q

what is the use of a video camera ?

A
  • it is used to record video footage
51
Q

what are the advantages of a video camera ?

A
  • that it can record in HD

- and that the footage can be edited on a computer

52
Q

what are the disadvantages of a video camera ?

A
  • it takes up a lot of space

- the cost of the camera is high

53
Q

what are the uses of a microphone ?

A
  • it is used in voice recognition applications

- used to input sound into computer

54
Q

what does microphones allow the user to do ?

A
  • to add instructions without using your hand
  • user can dictate text and other documents into your word-processor document or email package , this is called voice recognition
  • to join video-conferencing calls
  • to narrate over your website , presentations and multimedia systems
  • to input speech for VOIP
55
Q

what are the advantages of microphones ?

A
  • generally inexpensive
  • disabled people can benefit as they use spoken word to input instructions
  • can improve safety of cars
  • can be faster to speak instructions than typing them
56
Q

what are the disadvantages of a microphone ?

A
  • not 100% accurate so mistakes can occur
  • background noice can cause problems for voice recongition software
  • sound files when saved can take up a lot of disk space
57
Q

what are a graphical tablet ?

A
  • used with a stylus to produce handsfree drawings which can be stored on a computer
58
Q

what are the advantages of a graphics tablet ?

A
  • more accurate than drawing with other pointing devices such as a mouse
  • used in countries like japan or china where they use graphical represintation rather than words and letters
  • icons are placed on the graphics tablet rather on the screen , leaving more space on the screen for the drawing / design
59
Q

what are the disadvantages of a graphics tablet ?

A
  • a professinal graphics tablet is very expensive
  • its longer to produce
  • requries more desk space
60
Q

what is the use of a web-cam ?

A
  • it is used by people who want to have a video conference
61
Q

what are the advantage of a web-cam ?

A
  • allows face-to-face chat
  • can contact people without the need to travel
  • paretns can se their children or grandchildren if they do not live near
  • people can see other people reactions while talking to them
62
Q

what are the disadvantages of web-cams ?

A
  • quality is dependent on the internet connection
  • poor image quality at low resolutions
  • generally have a fixed position so you cant move it around
  • limited extra features to make image quality better
63
Q

what are sensors ?

A
  • sensors are devices that converts real world property into data that a computer can process , sensors are found in a lot of devices such as burgling alarm , central heating systems and washing machines , as well as sensing they are used for control in some way
  • they are used to input data for control of certain devices
64
Q

what are the advantages of sensors ?

A
  • Their readings are more accurate than those taken by a human
  • they can take readings more frequently than by a human
  • no human presence is needed , so cost is less
  • can work in dangerous environments such as : deep down mines or nuclear reactors.
65
Q

what are the disadvantages of sensors ?

A
  • their buying cost

- grease and dirt can affect performance

66
Q

list some examples of sensors and a use for each one .

A

Temperature : used in green houses to measure temperature
Light : umpires check light conditions in a cricket match
Moisture : used to check moisture in soil in greenhouses
Water-level : used in washing machines to measure water-levels
proximity : used in car parking to check distance
Movement : to detect movement which could trigger an alarm
Pressure : used in burglar alarms

67
Q

how does sensors work ?

A
  • data is collected from the real world as analogue data signals from the sensors. Computers only understands digital data. So and ADC ( analogue-to-digital converter) is used to convert analogue data to digital so the computer can understand it

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