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CompSci > Input Devices > Flashcards

Input Devices Flashcards

1
Q

Input device

A

Hardware device, which allows user to enter data into a computer

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2
Q

Hardware

A

The physical components of a computer

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3
Q

List 5 input devices

A

1) Keyboard
2) Mouse
3) Scanners (2D/3D)
4) Barcodes
5) QR-codes

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4
Q

How does a physical keyboard work?

A

When a key is pressed, an electronic signal goes to a computer. The computer processes the input and gives an output

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5
Q

How does a virtual keyboard work? (on mobile)

A

When the specific areas are pressed the output is triggered

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6
Q

List 2+ and 1- of a keyboard

A

+ Easy to use
+ No need for specific software and knowledge
- Takes lots of space

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7
Q

Mouse

A

It controls the pointer on the screen. Usually has 2 buttons and a scroll wheel. Older mice had a roller ball. Now a laser is being used

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8
Q

List 2+ and 1- of a laser mouse

A

+ Easy to use
+ No need for specific software and knowledge
- Smooth, not glass surface is needed

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9
Q

2D scanners

A

Used to scan physical documents and convert them into a digital format. The light source moves down the document and the reflection is captured. The captured image reflects onto several mirrors, convert it, send to the computer

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10
Q

List 1+ and 1- of a 2D scanner

A

+ Good quality image

- Take lots of space

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11
Q

3D scanners

A

Scan 3D objects, can be printed on a 3D printer. The scanner uses the reflection of the light or the X-rays to create a model

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12
Q

Where can 3D scanners be used? (1)

A

Airport security

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13
Q

When were barcodes developed?

A

1970s

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14
Q

Barcode

A

Illuminates the bars and the reflection is received as analog and converted into digital. Processes by a computer

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15
Q

List 1+ and 1- of a barcode

A

+ Very efficient way of finding info about the product

- Code damaged or not in the database it wouldn’t be read

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16
Q

QR codes

A

Can store bigger amount of characters than the barcode. Anyone can make a QR code and scan it

17
Q

What do the big squares around the QR code tell?

A

Where the QR ends

18
Q

List the things a barcode can contain? (5)

A

1) Text
2) Links
3) Contacts
4) Images
5) SMS or Email

19
Q

List 3+ and 1- of a QR code

A

+ If it is slightly damaged, still can be read
+ More efficient in storing data than Barcodes
+ Can be scanned without a database
- Not popular

20
Q

CAD

A

Computer aided design

21
Q

OCR - how?

A

Optical character recognition, a process where scanned document is recognised and converted to inputs

22
Q

OMR - how?

A

Optical mark recognition, a process where scanned marks on a page are automatically converted into inputs

23
Q

Biometric device

A

A device, which recognises human physical characteristics

24
Q

Give examples of a human physical characteristic (3)

A

1) Finger print
2) Iris
3) DNA

25
Q

Sensor

A

Device which recognises physical inputs

26
Q

Analogue

A

Signal , or data that constantly varies

27
Q

Digital

A

Signal, or data that consists of two state 1s and 0s

28
Q

Touch screen

A

Interactive device which combines liquid display LCD with a touch sensitive device

29
Q

Why a touch wouldn’t be detected by a smartphone by a finger in a glove

A

A glove doesn’t allow the natural electrical signals that we have in our body to de detected by the sensor

30
Q

How does the information gets transferred between a computer and a whiteboard

A

By a HDMI cable

31
Q

What does a microphone do?

A

Converts an analogue input into digital

32
Q

List 2+ and 2- of a digital camera

A

+ Images can be edited immediately
+ Easy sharing
- Takes lots of memory
- Pixels are in proportion to quality, smaller number of pixels, smaller the quality

33
Q

List 3+ and 2- of a touch screen

A 
\+ Simple to use
\+ Save space
\+ Multitouch 
- Can't be used in gloves
- If the screen is damages the touch can;t be used
34
Q

List 2+ and 1- of an interactive whiteboard

A

+ Useful for education
+ Large screen
- Must be accurately calibrated, to work properly

35
Q

List 2+ and 2- of a microphone

A

+ Disables users can use a microphone to input info
+ Speech recognition
- The sound is not always the best quality
- Speech recognition programs has to be trained

CompSci (15 decks)

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