t2.1 [computer component- input output device]
TRANSCRIPT
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Describe basic computer hardware, software, input,
output, communication and network devices.
To apply the suitable office application to
fulfill given task.
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Learning OutcomesDescribe the fivecomponents of a
computer
Describe varioustypes of inputdevices
Define input anddifferentiate among a
program, command,and user response
Define output and
describe varioustypes of output
devices
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A computer contains many electric, electronic, and
mechanical components known as hardware
Allows you to enter data and instructions into a computerInput Device
Hardware component that conveys information to one or more peopleOutput Device
Case that contains the electronic components of the computer thatare used to process data
System Unit
Holds data, instructions, and information for future useStorage Device
Enables a computer to send and receive data, instructions, andinformation to and from one or more computers or mobile devices
Communications
Device
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What Is Input? Input is any data and instructions enteredinto the memory of a computer
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What Is Input? Instructions can be entered into the computer in theform of programs, commands, and user responses
A program is a series of related
instructions that tells a computer
what tasks to perform and how to
perform them
Programs respond to commands
that a user issues
A user response is an instruction a
user issues by replying to a question
displayed by a program
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What Are Input Devices?
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Inputdevices
1)Keyboard
2)PointingDevice
3)GameController
4)DigitalCamera
5)VoiceInput
6)VideoInput
7)Scanners& Reading
Devices
8)Biometric
Technology
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1) The Keyboard A keyboard is an input device that contains keysusers press to enter data and instructions into a
computer
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Most desktop computer keyboards have
Between 101 and105 keys
A numeric keypad
on the right side ofthe keyboard
Function keys,
CTRL keys, ALTkeys, and arrowkeys
WINDOWS key APPLICATION key Toggle keys
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The insertion point, also known as the cursor, is a
symbol on the screen that indicates where the
next character you type will appear.
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Types of Keyboard
USB portWired
Keyboards
BluetoothIrDAWirelessKeyboards
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Ergonomic Keyboard An ergonomic keyboard has a design that reducesthe chance of wrist and hand injuries
Ergonomics incorporates comfort, efficiency, and
safety into the design of the workplace
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2) Pointing Devices
A pointing device is aninput device that allows
a user to control apointer on the screen
A pointer is a smallsymbol on the screenwhose location and
shape change as a user
moves a pointing device
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Mouse A mouse is a pointing device that fits under thepalm of your hand comfortably
Most widely used pointing device on desktop
computers
A mouse can be wired or wireless
O O2
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Mouse Mouse operations
Point Click Right-click Double-click
Triple-click Drag Right-dragRotatewheel
Free-spinwheel
Press wheel Tilt wheelPress thumb
button
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Other Pointing Devices
Trackball
A trackball is astationarypointing devicewith a ball onits top or side
Touchpad
A touchpad is asmall, flat,rectangularpointing devicethat is sensitiveto pressureand motion
Poi
nting
Stick
A pointingstick is apressure-sensitivepointing deviceshaped like apencil eraserthat ispositionedbetween keyson a keyboard
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Touch Screens
Touch sensitive display device.
Users can interact with touch screens by
touching areas of the screen.
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Touch-Sensitive Pads Touch sensitive pads enables user to
scrolls through and play music, view
pictures, watch video, adjust column
and customize settings. Touch sensitive pad typically
contains buttons/ wheels that are
operated with a thumb or finger.
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Pen Input With pen input, you touch a stylus or digitalpen on a flat surface to write, draw, or make
selections
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3)Game Controller Video games and computer games use a gamecontrolleras the input device that directs
movements and actions of on-screen objects
Gamepads
Joysticks and Wheels
Light guns
Dance pads
Motion-sensing controllers
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4) Digital Cameras A digital camerais a mobile device that allowsusers to take pictures and store them digitally.
3 basic types:- Most expensive
Highest quality
Used for professional studio workStudio cameras
Portable camera has many lenses
Expensive Used by photojournalistsField cameras
Less expensive. (Affordable price)
Lightweight
Average quality photography for home/small business user
Point-and-shootcamera
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Digital Cameras One factor that affect the quality of digital cameraphotos is its resolution.
Resolution is the number of horizontal and vertical pixels
in a display device. A digital cameras resolution isdefined in a pixels.
A pixel (short for picture element) is the smallest
element in an electronic image.
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5) Voice Input Voice inputis the process of entering input by
speaking into a microphone
Voice recognitionis the computers capability ofdistinguishing spoken words
Audio inputis the process of entering any sound
into the computer
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6) Video Input Video inputis the process of capturing full-
motion images and storing them on a computers
storage medium
2 video input examples;
Web cams
Video conferencing
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Video Input A Web camis a type of digital video camera that
enables a user to:
Capture video and still images
Send email message with video attachments
Make video call
Broadcast live images over the internet
A video conferenceis a meeting between two ormore geographically separated people
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7) Scanners and Reading Devices
Scannerand
Reading
Devices
Optical Scanner:- FlatbedScanner
OpticalReaders: -OCR,OMR
Bar Code ReaderMagnetic Stripe
Cards Reader
MICR Reader
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Optical Scanner
A flatbed scanner creates a file of the document
in memory
Works in a manner similar to a copy machine exceptit creates a file of a document in memory instead of
paper copy.
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Optical Readers Optical character recognition (OCR)involves reading
typewritten, computer printed, or hand in printed
character from ordinary document and translating the
images into a form that computer can process.
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Optical Scanner Optical mark recognition (OMR) reads hand-
drawn marks such as small circles or rectangles.
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Bar Code Readers A bar code reader, also called a bar code scanner
uses laser beams to read bar codes
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Magnetic Stripe Card Readers Magnetic stripe card readersread the magnetic
stripe on the back of cards such as:
Credit cards
Entertainment cards
Bank cards
Other similar cards
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MICR Readers MICR (magnetic ink character recognition) devices read text
printed with magnetized ink
An MICR readerconverts MICR characters into a form the
computer can process
Banking industry uses MICR for check processing
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8)Biometric Input Biometricsauthenticates a persons identity by
verifying a personal characteristic
Fingerprint
reader
Face
recognitionsystem
Hand
geometrysystem
Voice
verification
system
Signature
verification
system
Iris
recognition
system
Retinal
scanners
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What Is Output? Output is data that has been processed into a
useful form
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What Is Output Device? An output deviceis any type of hardware
component that conveys information to one or
more people
Displaydevices
PrintersSpeakers,
headphones,and earbuds
Dataprojectors
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Display Devices A display devicevisually conveys text, graphics, and
video information.
Monitor is a display device that is package as a
separate peripheral. 3 types of monitor:-
Liquid Crystal Display (LCD):uses a liquid compound topresent information on a
display device.
Plasma Monitor: are displaydevices that use gas plasmatechnology and offer screen
sizes up to 150 inches
Cathode Ray Tube (CRT) is adesktop monitor that containsa cathode-ray tube.
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Printers A printer produces text and graphics on a physical
medium
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Types of printers
Non Impact
Printer
Ink-jetPrinter
PhotoPrinter
LaserPrinter
ThermalPrinter
Multifuncti
on
Peripheral
Large
Format
Printer
Impact Printer
Dot MatrixPrinter
Line Printer
NON IMPACT PRINTER: forms characters and graphics on a piece of paper without
actually striking the paper
IMPACT PRINTER: form characters and graphics on a piece of paper by striking a
mechanism against an inked ribbon that physically contacts the paper
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Ink Jet Printer: forms characters andgraphics by spraying tiny drops of
liquid ink onto a piece of paper
Laser Printer: high speed black/colourprinter that produce a high qualitytext/image.
Photo printer: produces color photo-lab-quality pictures
Non-Impact printers
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Thermal Printer: generates images by
pushing electrically heated pins againstthe heat-sensitive paper
Multifunction Printer: is a single devicethat prints, scans, copies, and in somecases, faxes.
Large-scale printer: is a high cost , highperformance that create photo-realisticquality color prints on a larger scale(posters, signs etc)
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Impact Printer
Dot Matrix Printer: produces printed
images when tiny wire pins on a printhead mechanism strike an inked ribbon.
Line Printer: is a single device thatprints, scans, copies, and in somecases, faxes.
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Audio Output Devices An audio output deviceproduces music,
speech, or other sounds.
Speakers is an external device to a computer that
generate higher-quality sounds. Headphones are speakers that cover or are placed
outside of the ear
Earbuds (also called earphones) rest inside the earcanal
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Data Projector
A data projector is a device that takes the
text and images displaying on a computer
screen and projects them on a larger screen.
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Summary
Components of a
computer
Input and severaltypes of
commonly usedinput device
Output and severaltypes of commonlyused output device