1.4 TYPES OF PERIPHERAL DEVICES - INPUT AND OUTPUT Flashcards
WHAT IS AN OUTPUT PERIPHERAL DEVICE?
Peripherals that are connected to a computer and outputs the result of computer processing.
FUNCTION OF A MONITOR
Users can see output from computer display. Screen size measured diagonally, Resolution measured in pixels.
WHAT ARE THE TYPES OF PRINTERS?
Dot matrix
Inkjet
Laser
3D
DOT MATRIX
Print made by hitting paper through a ribbon of ink. Paper often has a number of carbon copy (paper made of carbon). Slowest type of printer. Cheap. Low cost of printing copy. Low quality. Used when multiple copies are required. Doesn’t usually print colour.
INKJET
Uses cartridges (cyan, magenta, yellow). Tiny dots of ink sprayed on paper forming print. Fast. Medium cost. High cost of printing copies. Prints colour. High quality. Used in home printing and photographs.
LASER
Printer contains rotating cylinder holding electrical charge. Laser is used to discharge certain points on drum and create image. Electrically charged toner is attracted to points on drum and is heated onto paper that is passed over drum. Fastest printer. Expensive. Medium cost per copy. Prints colour. Highest quality. Used in high-volume printing, often offices.
3D
Creates real-life versions of digital modules (AIRPLANE PARTS, ARTIFICIAL LIMBS, CAR PROTOTYPES).
PLOTTERS
Used by cartogrophers and engineers
Draws high quality images created in CAD software onto large paper.
WHAT IS CAD SOFTWARE?
Computer Artificial Design Software.
DATA PROJECTORS
Used in home entertainment systems and in giving presentations.
WHAT ARE THE FEATURES OF DATA PROJECTORS?
- Light bulbs - expensive
- Resolution
- Zoom
- Portability
WHAT ARE THE TWO TYPES OF ZOOM IN DATA PROJECTORS?
- OPTICAL ZOOM - Zoom in
- DIGITAL ZOOM - Zoom into specific area on screen.
SPEAKER
Computer can output sound.
WHAT ARE THE 3 TYPES OF SPEAKERS?
- Single speaker
- Stereo speaker
- Surround sound
SINGLE SPEAKER
Low quality sound - comes from one speaker
STEREO SPEAKER
Sound comes from both speakers
SURROUND SOUND
Sound is produced everywhere
CONTROL DEVICES (ACTUATORS)
Components in a system that makes something happen in the real world.
EXAMPLES OF CONTROL DEVICES?
- Valves
- Pistons
- Heaters
- Coolers
- Motors
WHAT IS AN INPUT PERIPHERAL DEVICE?
Peripheral devices that send data to computer. User can control computer from sources outside the system.
KEYBOARD
Use keys to interact with software. Sends data to computer wired / wireless.
WHAT DO MICE USE TO MOVE?
Use optical sensor to recognise movement of device. Sensitivity can be affected by surface its on. Some mice use roller balls to control pointer.
TRACKER BALL
Roll to move pointer. No buttons.
TRACK PAD
Sensors finger movements, touch and press.
JOYSTICK
Used in game controllers to move sprites in game.
GRAPHICS TABLET
Use stylus to draw
SCANNER
Use image/light sensors to record documents/images.
WHAT ARE THE TWO TYPES OF SCANNERS?
- OMR READER
- OCR READER
OMR READER
Optical Mark Recognition. Detects simple marks on computer.
WHAT IS OMR COMMONLY USED FOR?
Used for recognising and recording responses in multiple choice tests.
OCR READER
Optical Character Recognition. Reads characters in a document and stores result as text file.
DIGITAL CAMERAS
Uses light sensors to capture images formed by light passing through device’s lens.
WEBCAM
Lower quality than camcorders. Can be used as security cameras. Stream videos on internet. May have built in microphone.
MICRPHONE
Captures sound. Diaphragm moves when air hits it.
WHAT IS A DIAPHRAGM?
Thin, round object. In telephone, loudspeaker. Moved by sound and when producing sound.
WHERE IS TOUCH SCREEN USED?
Used in smartphones, input data by using a touch.
WHAT ARE THE TWO TYPES OF TOUCH SCREEN?
- Resistive.
- Capacitive
RESISTIVE SCREEN
Pressure when touch causes the two layers underneath to make a connection. More durable. Harder to read because more layers reflect more light. Only recognises one touch at a time.
CAPACITIVE SCREEN
Under glass layer there is a capacitive layer. Conducts electricity when screen is touched as small charge flows from finger. Used in smartphones. Closer finger is to charged area means more current is flowing away.
WHAT ARE THE TWO TYPES OF BARCODE SCANNERS?
- Linear
- Matrix
LINEAR
Detects barcodes - pattern of lines. Found on parcels
MATRIX
QR codes. Holds more information than linear. Scanned from any angle.
BIOMETRIC SCANNER
Measures unique physical characteristics.
EXAMPLE OF BIOMETRIC SCANNER?
1.Fingerprint (arch, loop, whorl)
2. Voice recognition
3. Face recognition.
4. Iris recognition
ADVANTAGES OF USING BIOMETRIC SCANNERS?
-not forgotten
-more difficult to trick
-speeds up transactions
-not restricted by language barriers
DISADVANTAGES OF USING BIOMETRIC SCANNERS?
-privacy and security concerns as detailed personal information is being stored electronically
-possible to trick
-expensive to buy
-uncomfortable
MAGNETIC STRIP READER
Reads data stored on a magnetic strip
CHIP AND PIN READER
Reads data stored on a PIN
SENSOR
Enter data about physical environment. Can be placed in dangerous places. Monitors continually. Removes possibility of human error. Senses things humans can’t. Data is easily converted into digital form.
EXAMPLES OF SENSORS?
-light sensor
-moisture and humidity sensor
-temperature
-proximity and distance sensors
-motion and movement
-pressure
CARD READERS
Reads data stored on a card.
WHAT CAN YOU DO WITH A CARD READER?
Unlock doors, secure areas, make payments, track people.
EXAMPLES OF CARD READERS?
-magnetic strip
-programmable chip
-RFID (Radio Frequency Identification)
NFC (Near Field Communication)
