ppt lesson 05

Unit 1—Computer Basics

Lesson 5Input, Output, and Storage

Computer Concepts BASICS - 2

Objectives

Identify and describe the most common input devices. Identify and describe the most common output devices. Identify and describe storage devices. Identify and describe how input and output devices are

connected to the computer.


Input and Output Devices

Input devices enable a user to input data and commands to the computer to be processed.

Output devices enable the computer to give or show you the results of its processing.

Some devices can perform both input and output operations.


Input Devices—The Keyboard

The keyboard is the most widely used input device. As you press keys on the keyboard, an

electrical signal representing that key is sent to the computer.

Keyboards are divided into sections.


Input Devices—The Keyboard (cont.)

Typewriter keys: The standard alphabetic and numeric characters you would find on a typewriter

Function keys: Special keys that perform some specific function for the application being run

Numeric keypad: Used for mathematical operations

Directional keys: Used to move the cursor around the screen


Input Devices—The Mouse

The mouse is a pointing device that rolls around on a flat surface and controls the location of the pointer on the screen.

The mouse performs the following functions: Pointing: Placing the on-screen pointer at a

specific place Clicking: Pressing and releasing the

mouse button


Input Devices—The Mouse (cont.)

Mouse functions (cont.) Dragging: Holding down the mouse button

and dragging an object to a new location by dragging the mouse

Double-clicking: Pressing and releasing the mouse button twice very quickly

Right-clicking: Pressing the right mouse button


Other Pointing Devices

Other devices that control the on-screen pointer: Trackball: This is like a mouse turned upside

down. You roll a ball around with your fingers to control the location of the pointer.

These frequently are found on notebook computers.


Other Pointing Devices (cont.)

Joystick and wheel: Joysticks consist of a metal or plastic handle mounted on a base that you can move in any direction to move the pointer or other object.

These typically are used for video games.Most have buttons that can be pushed

or clicked to control input/output.


Other Input Devices

Pointing stick: A pressure-sensitive device that resembles a pencil eraser; found mostly on notebook computers

Graphics tablet: A flat drawing surface connected to the computer The user draws on the surface, and the

figures or writing on the tablet can be input to the computer for processing.


Other Input Devices (cont.)

Touch display: Screens that contain pictures or shapes that the user can press to input that data

Stylus/digital pen: Used with mobile devices to input data

Touchpad: Used mostly in laptop/notebook computers



Audio/voice input: Inputting sound and/or voice These usually require a microphone and

special voice recognition software to be installed on the computer.



Scanners: Devices that can convert a graphical image into a digital image and input it to the computer Types of scanners include

Image scanners for scanning images and textBar code scanners to read product bar codesMagnetic scanners to read the magnetic strip

on a credit card



Digital cameras: Used to take pictures and store them on a magnetic disk instead of on film Their images can be input directly into the

computer.Video input: Input from a camcorder or

VCR using video capture cards



Biometric input: Uses fingerprint, face, handwriting, and voice for identification


Magnetic Storage Devices

Floppy disks: Small, portable disks that hold a limited amount of data

Hard disks: Large-capacity and fast-access storage devices

Zip disks: Auxiliary storage devices that can hold large quantities of data and can be portable

Magnetic tape drives: Used for making system backups and storing large quantities of data


Optical Storage Devices

CD-DA: Audio CDCD-R: This drive allows you to read and to

write to a compact diskCD-ROM: Can hold large amounts of data,

but is read-only access


Optical Storage Devices (cont.)

CD-RW: Can be written on several timesDVD-ROM: Read-only DVD formatDVD-R: Similar to CD, but holds more data;

read-onlyDVD-RW: Can be written on several timesPhotoCD: Used for storing digital

photographs on a CD


Solid-State Storage Media

Non-volatile removable mediaMiniature mobile media

Uses integrated circuitsUSB flash drive

Connects to the computer via a USB port


Caring for Storage Media

To safeguard your data from damage, follow these tips when dealing with removable media: Keep away from magnetic fields. Avoid extreme temperatures. Never try to disassemble the case. Remove media from drive when not being

used.


Caring for Storage Media (cont.)

Tips for dealing with storage media (cont.) Write-protect important data. Hold optical disks at their edges. Never remove the media from the drive if the

access light is on. Keep disks in a sturdy case when

transporting them.


Output Devices—Monitors

Monitors are used to display video output to a user.

Monitors may be monochromatic or color. Monochromatic monitors display output in a

single-color display.


Output Devices—Monitors (cont.)

Factors that influence the quality of a monitor Screen size: The diagonal measurement in

inches of the display area Resolution: The number of pixels that can be

displayed in the display area Dot pitch: The distance between each pixel in

the display area


Typical Computer Monitor

This figure shows a typical computer monitor on a swivel stand that can be adjusted for viewing comfort.

LCD

Gas plasma


Output Devices—Printers

Printers are used to create a hard copy of a document or image. Printers vary by speed, quality, and price.


Output Devices—Printers (cont.)

The most popular types of printers areLaser: Produce images using the same

techniques as copier machinesInk jet: Use fine nozzles to spray ink onto

the page as the paper passes throughDot matrix: Work similarly to a typewriter in

that ink is transferred to the paper by some part of the printer striking a ribbon to transfer an image


Laser Printer

This figure provides an overview of a laser printer.


Ink Jet Printer

This figure provides an overview of an ink jet printer.


Other Types of Output Devices

Speakers and headsetsFax machines and fax modemsMultifunctional devices

Contain a variation of output optionsData projectors


Connecting I/O Devices to the Computer

Input and output devices must be connected to the computer before they can be used.

Connecting I/O devices to the computer: Plug the device into an existing socket or port

on the back of the computer. Install an expansion card with the port you

need included on the back of the card. Connect wirelessly.


Summary

Input devices enable you to input data and commands into the computer.

The most common input devices are the keyboard and mouse.

Other types of input devices include trackball, joystick and wheel, pointing stick, graphics tablet, touch display screen, stylus, voice recognition devices, touchpad, scanner, digital camera, video input, and biometric input.


Summary (cont.)

To maintain a permanent copy of data, you should store it on some type of storage medium.

The three categories of storage media are magnetic storage, optical storage, and solid-state storage.

Monitors and printers are examples of output devices.


Summary (cont.)

Monitors produce soft copy.Printers are used to produce a paper or

hard copy of the processed result.Criteria for selecting a printer include

speed, print quality, and cost. Input and output devices must be physically

connected to the computer.


Summary (cont.)

Some input devices communicate with the computer through a physical connection.

Wireless devices communicate with the computer through infrared or radio waves.

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