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CompSci > Output Devices > Flashcards

Output Devices Flashcards

1
Q

Peripheral

A

An external device that is connected to a computer

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2
Q

Soft copy

A

Data and information that is virtual

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3
Q

Hard copy

A

Data and information that is physical

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4
Q

Footprint

A

The space taken up by peripheral

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5
Q

Pixel (3 points)

A

Short for picture element; it is illuminated dot; many pixels together form an image

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6
Q

Resolution

A

The number of pixels in a display

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7
Q

Display

A

An electronic device that outputs information via a screen or projection

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8
Q

List primary colours

A

Red,Green,Blue

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9
Q

Colour depth

A

The degree to which a particular colour can be represented

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10
Q

List 3+ and 2- of flat panel displays

A

+ High resolution
+ Made be at a size ideal for a portable device
+ Low energy requirements
- Easily damaged
- Dead pixels that will spoil the display

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11
Q

Two types of flat panel displays

A

LCD - Liquid crystal displays

LED - Light emitting diode

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12
Q

How does an LCD work?

A

Separate RGB pixels arranged in tiny blocks. The crystals can be made solid or transparent by altering the current

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13
Q

When the crystals are liquid….

A

Light can go through and the pixel is illuminated

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14
Q

What is more advanced LED/LCD

A

LED

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15
Q

How does an LED work?

A

Like LCDs but pixels are backlit with light emitting diodes. LED brighter and direct light

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16
Q

What has an uneven brightness across the screen

A

LED

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17
Q

What is thinner and lighter

A

LED

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18
Q

Unless viewing straight may be hard to see

A

LCD

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19
Q

How does a LCD processor work?

A

3 separate glass panels for each RGB colour, as the light passes individual pixels can be opened to allow the light trough.

20
Q

When are LCD projectors useful?

A

When contrast and brightness are important

21
Q

How does a DLP projector work?

A

Uses millions of tiny mirrors to reflect light towards the projection lens

22
Q

Compare the image of a DLP projector to a LCD projector

A

DLP - excellent colour representaation, less contrast and brightness to LCD.

23
Q

Which projector is smaller?

A

DLP

24
Q

What base colours do printers use?

A

1) Cyan
2) Magenta
3) Yellow
4) Black

25
Q

Types of printers (3)

A

1) Inkjet printer
2) Laser printer
3) 3D printer

26
Q

How does an inkjet printer work?

A

Ink is sprayed on the paper through the microscopic nozzles

27
Q

Advantages of inkjet printers (2)

A

1) Cheaper than other printers

2) Excellent image quality when using photography paper

28
Q

Disadvantages of inkjet printers (4)

A

1) Use a lot of ink which is expensive
2) Poor image quality on normal paper
3) Difficult to print on both sides
4) Slow in printing

29
Q

How does a laser printer work?

A

Use laser to create static electricity where the tonner sticks. Uses fusing element to bond tonner to the page

30
Q

How do you call laser printer powder?

A

Tonner

31
Q

Advantages of laser printers (4)

A

1) Cheap to run as they cartridges last longer
2) Text printing is good quality
3) Quick at printing
4) Duplex printing reduced paper cost

32
Q

Disadvantages of laser printers (3)

A

1) Expensive to buy (laser technology)
2) Images on photographic paper is worse than on inkjet
3) Bigger than inkjet

33
Q

What does CAD stand for?

A

Computer aided design

34
Q

CAD

A

Software that allows a user to design and create an image of an object

35
Q

What does CAM stand for?

A

Computer aided manufacturing

36
Q

CAM

A

A computer controls machinery to manufacture an object

37
Q

What does CNC stand for?

A

Computer numerical control

38
Q

CNC

A

The method of control used by CAM

39
Q

How does a 3D printer work?

A

Digital object is split into tiny horizontal layers. Printer uses material to slowly print each layer on top of the other

40
Q

What materials can a 3D printer use? (3)

A

1) Polymers
2) Plastic
3) Acrylic

41
Q

Advantages of CAM (3)

A

1) Items manufactured to a higher precision than by hand
2) High production quality can be kept
3) High quality bespoke items and prototypes

42
Q

Disadvantages of CAM (3)

A

1) Training is required to use CAM
2) Bespoke items and prototypes may be expensive to produce
3) CAM is expensive to introduce because of hardware and software costs involved

43
Q

What does DAC stand for?

A

Digital to analogue convertor

44
Q

DAC

A

A device that converts digital signals to analogue

45
Q

Advantages of a speaker (3)

A

1) Variety information to be provided to the user
2) Aid disabled user when operating a device
3) Warn large number of people (emergency)

46
Q

Disadvantages of a speaker (2)

A

1) Built-in speakers - low quality

2) Sound may disturb the others

CompSci (15 decks)

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