Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

IGCSE Computer Science > Input and Output Devices > Flashcards

Input and Output Devices Flashcards

(59 cards)

Start Studying
1
Q

What are input devices

A

Input devices are hardware components that allow users to interact with a computer system which the computer then processes to produce an output

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Actuator

A
  • Converts energy into motion
  • Makes things move
  • Performs physical tasks based on instructions from a computer or control system
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Why is an actuator used?

A

Essential in any system that requires movement

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Digital Light Processing (DLP) projector

A
  • Projects images onto a screen
  • Shows images or video by shining light through tiny mirrors
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Why is DLP projector used?

A

High-quality images

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Inkjet printer

A

Prints text and images onto paper by spraying tiny droplets of ink

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Why is an inkjet printer used?

A

Low cost compared to the very high initial purchase cost of a laser printer.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Laser printer

A

Heat from a laser fuses toner (fine powder) onto paper using a rotating charged drum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why is a laser printer used?

A
  • High-quality prints
  • Low cost per page over large print volumes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Light Emitting Diode (LED) screen

A

Displays images and video using tiny lights called LEDs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why is an LED screen used?

A
  • increased viewing in sunlight
  • Brighter colours
  • Energy efficient
  • Display is thinner
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Liquid Crystal Display (LCD) Screen

A
  • Liquid crystal display
    − The display is made of pixels
    − arranged in a matrix
    − Uses a flat panel display
    − Backlit display
    − with LEDs
    − Colours created using RGB
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why is an LCD screen used?

A
  • Low power consumption and runs at a cool temperature
  • No image burn or flicker issues
  • High resolution images
  • Bright image colours
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Liquid Crystal Display (LCD) projector

A

Projects images or video onto a screen by shining light through liquid crystal panels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Why is an LCD projector used?

A
  • Bright
  • Excellent balance of quality and affordability
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Speaker

A

Converts electrical signals into analogue sound waves to play music

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Why is a speaker used?

A

Multiple shapes and sizes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

3D Printer

A

Adds thin layers of plastic, one on top of another to form a three dimensional object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Why is a 3D printer used?

A
  • Create prototypes
  • Custom parts
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are output devices?

A

Output devices are hardware components that receive information from a computer system and present it to the user in an understandable form and enable the computer to communicate the results of processed data or commands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What does an acoustic sensor measure?

A

Sound levels

Typical uses include detecting changes in sound levels of industrial machinery, monitoring noise pollution, and in security systems to detect suspicious sounds.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What does an accelerometer measure?

A

Acceleration rate, tilt, vibration

Typical uses include detecting sudden changes in vehicle movement and deploying safety features if needed, and in mobile phones to detect orientation of the device.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What does a flow sensor measure?

A

Rate of gas, liquid, or powder flow

Typical use includes detecting changes in the flow through pipes in water systems.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What does a gas sensor measure?

Study These Flashcards
A

Presence of a gas (e.g., carbon monoxide)

Typical uses include detecting levels of gas in confined spaces and detecting gas levels when fixing gas leaks.

25
What does a humidity sensor measure?
Levels of water vapour ## Footnote Typical use includes monitoring humidity in greenhouses.
26
What does an infra-red sensor measure?
Detecting motion or a heat source ## Footnote Typical uses include security systems detecting intruders who break the beam and measuring heat radiation of objects, used by emergency services to detect people.
27
What does a level sensor measure?
Liquid levels ## Footnote Typical uses include detecting levels of petrol in a car tank, detecting levels of water in a water tank, and detecting a drop in water levels due to a leak.
28
What does a light sensor measure?
Light levels ## Footnote Typical use includes automatically switching on lights when it gets dark (e.g., street lights, headlights).
29
What does a magnetic field sensor measure?
Presence and strength ## Footnote Typical uses include anti-lock braking systems and monitoring rotating machinery such as turbines.
30
What does a moisture sensor measure?
Presence and levels of moisture ## Footnote Typical uses include monitoring moisture in the soil and monitoring dampness in buildings.
31
What does a pH sensor measure?
Acidity or alkalinity ## Footnote Typical uses include monitoring soil to ensure optimum growing conditions and monitoring pH levels in chemical processes.
32
What does a pressure sensor measure?
Gas, liquid, or physical pressure ## Footnote Typical uses include monitoring tyre pressure and monitoring pressure in pipes during the manufacturing process.
33
What does a proximity sensor measure?
Distance ## Footnote Typical uses include monitoring the position of objects in robotics and used in safety systems to prevent objects from colliding.
34
What does a temperature sensor measure?
Temperature in Celsius, Fahrenheit, or Kelvin ## Footnote Typical uses include maintaining temperature in swimming pools and controlling temperature in chemical processes.
35
What does a Barcode Scanner do?
Reads barcodes to capture product information.
36
Why is a Barcode Scanner used?
Quickly and accurately retrieves product details for stock and checkout.
37
What does a Digital Camera do?
Captures photographs or videos as digital images.
38
Why is a Digital Camera used?
High-quality visual content.
39
What does a Keyboard do?
Inputs text and commands by pressing keys.
40
Why is a Keyboard used?
Type documents, enter data, control software.
41
What does a Microphone do?
Captures analogue sound and converts it into digital signals.
42
Why is a Microphone used?
Audio recording, voice communication.
43
What does an Optical Mouse do?
Moves the cursor on the screen based on hand movements over a surface.
44
Why is an Optical Mouse used?
Precise control and navigation on a computer screen.
45
What does a QR Code Scanner do?
Reads QR codes to access stored information.
46
Why is a QR Code Scanner used?
Quickly retrieves data from QR codes, website links or product information.
47
What does a Touch Screen (Resistive) do?
Detects touch by pressing a flexible screen layer.
48
Why is a Touch Screen (Resistive) used?
Direct interaction with the device.
49
What does a Touch Screen (Infra-red) do?
Detects touch by interrupting infrared light beams across the screen.
50
Why is a Touch Screen (Infra-red) used?
Accurate touch detection, works well in various lighting conditions.
51
What does a Touch Screen (Capacitive) do?
Detects touch through changes in electrical charge on the screen surface.
52
Why is a Touch Screen (Capacitive) used?
Smooth, responsive touch experience with multi-touch capabilities.
53
What does a Two-Dimensional (2D) Scanner do?
Captures flat, 2D images of documents or photos.
54
Why is a Two-Dimensional (2D) Scanner used?
Digitises documents and photos for storage, editing, or sharing.
55
What does a Three-Dimensional (3D) Scanner do?
Captures detailed 3D shapes and dimensions of objects.
56
Why is a Three-Dimensional (3D) Scanner used?
Creates digital models of objects for design, analysis, or reproduction.
57
What are sensors?
- Sensors are input devices and measure a physical property of their environment - A process where outputs are recycled and used as inputs, creating a continuous cycle is called a feedback loop
58
Inkjet Printer benefits
- Printing may be higher quality - Can use larger paper sizes - Can print onto different media - No warm-up time
59
Inkjet printer Drawbacks
- Printing will be slower - Ink is more expensive per page - Ink can be smeared // ink is not smudge proof

IGCSE Computer Science (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions