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Computer Science > Input and Output Devices > Flashcards

Input and Output Devices Flashcards

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1
Q

Describe how a barcode scanner works (5)

A

red laser shone on barcode

light reflected back (white lines reflect more light)

sensors detect light

microprocessor decodes data

bars will give different binary values

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2
Q

Barcode applications (3)

A

supermarket checkout

library system

Airport check-ins

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3
Q

Disadvantages of keyboard (3)

A

dirt/food can get into keys

easy to make a mistake

can be slow

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4
Q

Advantages of concept keyboard (2)

A

fewer typing errors

stops dirt/food as it has protective layer

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5
Q

Touchscreen application (3/5)

A

Ticket/ information kiosk

Mobile phone/ tablet

Control room interface

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6
Q

How inkjet printer works (3)

A

print head moves nozzles side to side across page

nozzles spray liquid ink droplets on paper

ink droplets created using piezoelectric or thermal bubble technology

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7
Q

Benefits of laser printer (3)

A

can print duplex

Faster printing

Cheaper long term (does not have to purchase ink cartridges)

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8
Q

Advantages of inkjet printer (3)

A

Cheap to initially purchase

high quality output

relatively quiet

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9
Q

Inkjet disadvantages (3)

A

ink cartridges dont last long

expensive to run

printing can smudge

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10
Q

How laser printer works (4)

A

Uses toner cartridges

Uses charged print drum

Uses static electric charges

Toner fused to paper

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11
Q

Application of 3D printers(3)

A

prototypes/models

parts of vintage car

creating museum artifacts

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12
Q

When are inkjet printers used? (3)

A

high quality images

photographs

low volume printing

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13
Q

When are laser printers used? (2)

A

high speed printing

large volume printing

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14
Q

What are barcodes made up of?

A

series of black and white parallel lines

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15
Q

Appearance of QR code

A

matrix of black squares on white background

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16
Q

How do resistive touchscreens work (5)

A

uses multiple layers of material

transmits electric currents

when touched, top layer pushed into bottom layer

electric current changes

location of touch found

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17
Q

Advantages of resistive (2)

A

cheap technology

can use gloved fingers to input

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18
Q

Disadvantages of resistive (3)

A

does not allow multi-touch

poor visibility in sunlight

vulnerable to scratches

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19
Q

How do capacitive touchscreens work (4)

A

electric fields created between glass layers

sensors monitor electric field

touched = electrostatic charge transferred to finger

location of touch calculated

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20
Q

Advantages of capacitive touchscreen (3)

A

allows multi-touch

durable surface

good visibility in sunlight

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21
Q

Disadvantages of capacitive touchscreen (2)

A

cannot use when wearing gloves

screen will shatter on impact

22
Q

How do infrared touchscreens work? (5)

A

infrared rays sent across screen from edges

rays form grid around screen

sensors capture beams

infrared ray broken by finger touching screen

calculation made where beam broken to locate touch

23
Q

Advantage of infrared touchscreens (3)

A

allow multi-touch

allows gloved fingers to be used

durable

24
Q

Laser printer disadvantages (3)

A

larger carbon footprint

more time to warm up

toner cartridge more expensive

25
Q

Disadvantages of infrared touchscreens (3)

A

sensitive to moisture

sensitive to light interference

accidental activation if infrared disturbed

26
Q

How QR code works (7)

A

scanned by camera

light reflected back

black squares reflect less than white squares

3 large squares define alignment

square’s data decoded - each square has binary value

processed by app

links to website or document

27
Q

QR code benefits (3)

A

hold more data

easier to read - can be read just using cameras

easier to transmit QR codes

28
Q

QR code disadvantages (2)

A

can be used to transmit malicious codes

more than one QR format available

29
Q

Why might a capacitive touchscreen not work if the person is wearing gloves (2)

A

gloves are not conductive

gloves block charge from finger

30
Q

How can a mobile phone be used without removing gloves

A

use capacitive gloves - allows charge to be disturbed

31
Q

How can a barcode help manage stock (3)

A

identifies unique product

can automatic re-order product

can be used to look up product

32
Q

How digital cameras work (5)

A

images converted from analogue to digital using ADC

image turned to pixels

each pixel given value/colour

pixels form grid

pixels stored in sequence

33
Q

How DLP screen works (5)

A

uses tiny mirrors

mirrors laid out in grid

mirrors tilt towards/away from light source

mirrors reflect light towards lens

colour produced using colour wheel

34
Q

Benefit of LCD projector (3)

A

uses less power

higher resolution

runs quiter

35
Q

How optical mouse works (5)

A

shines LED under mouse

light reflects back through lens

converted to value

value transmitted to computer

computer determines direction and speed of movement

36
Q

How keyboard works (4)

A

key pushes switch on circuit board

completes circuit

location of press calculated

location corresponds to ASCII value

37
Q

When does an interrupt occur (3)

A

paper jam

out of ink

out of paper

38
Q

What happens when paper gets jammed in printing process (2)

A

printing stops

interrupt is sent to computer

39
Q

Examples of output devices (3)

A

monitor

speaker

headphones

40
Q

Examples of input devices (3)

A

keyboard

mouse

microphone

41
Q

What type of device is an actuator (output or input)

A

output device

42
Q

LED benefits (3)

A

consumes less power

has bright screen/colours

lasts long

43
Q

Actuator description

A

operated by signals to cause physical movement

44
Q

How barcode finds price of product (3)

A

database stores data

barcode value transmitted to database

price is found

45
Q

How LCD works (6)

A

beam of light generated by a bulb

light sent to group of chromatic-coated mirrors

mirrors reflect light back at different wavelengths corresponding to RGB

3 different light components pass through 3 LCD screens

images combined using prism to create full colour image

image passes through projector lens onto a screen

46
Q

What does LCD stand for

A

Liquid Crystal Display

47
Q

How 2D scanner works (5)

A

paper placed on a glass panel

light illuminates document

scan head moves across document

lens focuses on document image

scanned image turned to electric form by CCD

48
Q

Applications of 2D scanners (3)

A

airports - read passport

OCR software - read text

digital camera

49
Q

How 3D scanners work (3)

A

object has x,y coordinates

scans along coordinates

scanned image used by CAD

50
Q

What do QR codes stand for

A

quick response codes

51
Q

How microphone works (3)

A

diaphragm vibrates producing electric signal

signal goes to sound card

converted into digital values

Computer Science (15 decks)

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