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CAT > Input and Output > Flashcards

Input and Output Flashcards

1
Q

Input can… [2]

A
  1. Provide Running software with instructions
  2. Be the data that must be processed
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2
Q

The camera

A

Input
- DSLR: Changeable lens, compact
- MP → the max resolution (total number of pixels that make up the image)

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3
Q

Scanner

A

Input device that scans images to a computer (barcodes, photos, 3D objects)

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4
Q

DPI

A

Dots per Inch: quality of scanned image
- Greater DPI = higher number of pixels; better image quality; larger file size
- Managed by software

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5
Q

Colour depth

A

Number of colours that can be represented by a pixel

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6
Q

Advantage of scanners

A
  • Large documents stored in a single file
  • Digital = does not take up physical office space
  • Faster communication (emailing, QR codes)
  • Scanning text to edit (OCR)
  • Speedy checkout proces (POS)
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7
Q

Limitations of scanners

A
  • Digital image copy depends on the quality of the physical one
  • Scanning may take time
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8
Q

OCR

A

Optical Character Recognition
A type of software that can convert images of scanned text to editable text

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9
Q

Biometric input

A

Capture unique biological features of a person (fingerprint, iris) for identification

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10
Q

Advantages and limitations of biometrics

A

Advantages:
- More secure than passwords; cannot easily be copied

Limitations:
- Expensive to implement and maintain
- Requires additional hardware/software

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11
Q

Advantages and disadvantages of ATMs

A

Advantages:
- Banking anytime of the day
You are not limited to a single bank’s ATM in or outside the country

Disadvantages:
- Makes you prey to criminals
theives install “skimmers” in ATMs to captureyou details

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12
Q

RFID

A

Radio frequency idenitfication
- automatically recognises item
- Tags store data on cards which can be detected wirelessly

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13
Q

POS

A
  • Scanners record stock; data is stored in a database with an allocated price for each item
  • Cashier scans item you are buying
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14
Q

Advantages and liitations of POS

A

Advantages:
- Faster than typing prices
- Greater accuracy in prices
- Regulating stock

Disadvantages
- When the system is offline, it does not work
- Expensive to maintain
- Requires software

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15
Q

Practical example as sensors as an input device

A
  • Detecting motion
  • Vital signs of patients e.g. blood pressure, pulse etc.
  • Monitoring/measuring weather data e.g. temperature, humidity, air pressure etc.
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16
Q

Advantage of sensors

A

Used in situations that are hazardous for humans
- Automatically captured, without human interaction and immediately
- No chance of human error in data capture

17
Q

Accelerometer

A

Detects the way the device is being held or moved ie: playing car game while turning device as a ‘wheel’

18
Q

The purpose of output

A
  1. Provide user with feedback
  2. Provides permanant or non-electronic copy of results of processing
  3. Allows transmission of data between devices
19
Q

Touchscreens as an input AND output evice

A
  • Provides intimate feedback to the user
  • Interaction between user and computer
  • Display content easily upated
  • Text can be enlarged for the visually impared
20
Q

Types of output [3]

A
  1. Visual: pop-ups, movies, hard/soft copies
  2. Sound: error messages, music
  3. Touch: vibration from joysticks, typing
21
Q

Disadvantages of output

A
  • non-permanant
  • difficult to share
  • eye strain
  • chows electricity
22
Q

Screen size, contrast ratio, aspect ratio, response time

Monitor

A
  • Screen size: measured in inches
  • Contrast ratio: number of shades between whitest white and blackest black
  • Apect ratio: width and heigh of screen (4:3, 16:10)
  • Response time: How quickly the monitor updates its pixels
23
Q

Laser printers over inkjet printers

A
  • More reliable (no nozzle to clog ink or dry out)
  • Easier to maintain
  • Cheaper to run

However, inkjets create more high quality photos

24
Q

What makes devices work?

A
  1. Drivers
  2. Plug and play
25
Q

Drivers

A

software that allows computer to communicate with the hardware

26
Q

Plug-and-play

A
  • Series of technology where the OS automatically detects and configures device, making it immediatly useable
  • Identifies if driver is required or not
27
Q

How to avoid health issues

A
  • Don’t sit for hours on end
  • Do not stare at the screen for long periods of time
  • Learn keyboard shortcuts to avoid wrist movement
  • Do not turn volume up too loud
28
Q

RSI

A

Repetitive Strain Injury caused by improper technique or overuse of devices

CAT (6 decks)

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