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computer science > chapter 2 part 1 ( input and output devices ) > Flashcards

chapter 2 part 1 ( input and output devices ) Flashcards

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1
Q

why are converters used ? [3]

A
  • as humans we use analogue data
  • computers only understand digital data
    -therefore, converters are used to convert from analogue to digital or digital to analogue
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2
Q

define analogue data

A

data that is constantly varying

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3
Q

define digital data

A

discrete data that is made up from only two values 0 or 1

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4
Q

define ADC

A

a device that converts analogue data to digital data

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5
Q

define DAC

A

a device that converts digital data to analogue data

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6
Q

define input devices

A

device used to enter data into a computer system

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7
Q

define keyboard (purpose)

A

an input device that is used to type in data ( texts, number and symbols)

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8
Q

define an optical mouse [2]

A
  • an input device used to control a pointer / cursor on a screen
  • uses laser and optical sensor to detect the movement
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9
Q

define microphone ( purpose)

A

an input device used to input sound to a computer

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10
Q

uses of a microphone [2]

A
  • used to input sound in voice recognition software to enhance security
    -used to input in speech recognition software to convert voice into text
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11
Q

define voice recognition

A

a piece of software used to identify a known user from their voice

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12
Q

define speech recognition

A

a piece of software that recognises spoken words

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13
Q

define digital camera [2]

A
  • input device used to capture digital photographs
    -it uses a lens and a sensor to capture light
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14
Q

define 2D scanner (purpose)

A

an input device used to convert hard-copy images/ documents into a digital format

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15
Q

state two types of software that work with 2D scannera

A
  • optical character reader (OCR)
  • optical mark recognition (OMR)
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16
Q

define OCR

A

software that scans text from a document to be converted into a text file format

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17
Q

define OMR

A

software is used to detect the presence of marks in certain positions on a paper form

18
Q

define 3D scanner

A

an input device used to scan solid objects and produce a 3D-digital model

19
Q

what is a barcode? [2]

A
  • a barcode is a series of black and white lines of varying thickness
    -used to represent numeric digits or characters
20
Q

define barcode scanner (purpose) [2]

A
  • input device used to scan barcodes
    -it uses laser and sensors to convert barcodes to binary values
21
Q

advantages of using barcodes compared to entering data manually [2] ?

A
  • quicker to input data
    -fewer errors are produces as there is no human error
22
Q

disadvantages of using the barcodes system compared to entering data manually ? [2]

A
  • if the barcode is damaged or not printed clearly , it may not scan properly
  • the barcode system is more expensive
23
Q

what is a QR code?

A

matrix of black and white squares that can link to websites, videos, text .. etc

24
Q

definition and purpose of a QR code scanner [2]?

A
  • input device used to scan QR codes
    -it uses red laser and sensors to convert QR codes to binary values
25
Q

advantages of using QR codes compared to barcodes? [5]

A
  • can hold more dta
  • fewer errors in scanning ( as QR codes allows the use of error-checking systems)
  • QR codes are easier to scan (as can be read using cameras on smartphones)
    -QR codes are faster to scan
    -it is possible to encrypt QR codes , which gives them greater protection
26
Q

disadvantages of using QR codes compared to barcodes? [2]

A
  • QR codes can be used to transmit malicious codes
    -more than one QR format is available
27
Q

differences between QR code and barcodes ? [3]

A
  • QR codes are 2D but barcodes are 1D
    -Qr codes contain squares while barcodes contain vertical line
  • QR codes can be read from any angle but barcodes must be aligned with barcode reader to be read
28
Q

uses of QR code [3]

A
  • advertising products
    -giving automatic access to a website or contact telephone number
    -storing boarding passes electronically at airports and train stations
29
Q

uses of barcodes [2]

A
  • checkouts in supermarkers
  • libraries
30
Q

definition and purpose of a touchscreen ?

A

an input device that allows simple touches to carry out many of the functions of a pointing device

31
Q

advantages of using touchscreens compared to using keyboards ? [3]

A
  • does not require peripherals (mouse or keyboard)
    -less chance of input error
    -resistant to weather
32
Q

define capcative touchscreen

A

touchscreen that operates by using the conductive properties of the object/ finger that is used to touch the screen

33
Q

advantages of using capcative touchscreens ? [3]

A

-better visibility than resistive touchscreens, especially in strong sunlight
- high resistance to scratching ( durable surface )
-allows multi touch facility

34
Q

disadvantages of using capcative touchscreens ? [2]

A
  • cant be used while wearing standard gloves (only bare fingers, stylus and conductive gloves can be used)
    -sensitive to magnetic fields
35
Q

define resistive touchscreens [2]

A
  • touchscreen that makes use of 2 layers
  • when the top layer is touched, the top layer and the bottom layer complete a circut at the point of touching
36
Q

advantages of using resistive touchscreens? [3]

A
  • cheap to manfacture
    -good resistance to dust and water
    -can be used with bare fingers, stylus and gloved hand
37
Q

disadvantages of using resistive touchscreens? [4]

A

-low touch sensitivity
-doesn’t support multi-touch facility
-poor visibility in strong sunlight
-vulnerable to scratches on the screen

38
Q

define infrared touchscreen ? [2]

A
  • touchscreen that uses sensors and infrared beams
    -sensors detect the point of touching through a break in the beam
39
Q

advantages of using infrared touchscreens ? [3]

A
  • allows multi-touch facilities
  • has good screen durability
    -the operability isn’t affected by a scratched or cracked screen
40
Q

disadvantages of using infrared touchscreens ? [3]

A
  • expensive to manufacture
    -the screen is sensitive to water and dust
    -sometimes sensitive to light interference

computer science (5 decks)

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