Basic Functions of Computers by cuiliqing


									         Mrs. Judy Kehr
      Mrs. Glenith Moncus
       Mrs. Gerri Kimble
Business Technology Applications
Computer Functions
 Computers perform the same four basic functions:
   Input
   Process
   Output
   Storage
 Getting data into the computer
 Processed data is information
 Devices used for input include:
    Keyboards
    Mice
    Voice (Microphones or Headsets with Microphones)
    Web Cameras and Digital Cameras
    Joysticks/Gamepads
    Touch screens
    Pens/Styluses (or Styli)
    Scanner
 To perform basic operations on data
 The Central Processing Unit (CPU) is the brain of the
  computer; also called microprocessor or computer chip
 Contains the ALU (arithmetic/logic unit)
 Processing speed is measured in GHz (gigahertz)
 Two of the most popular companies that manufacture
  processors are
    Intel (Intel® Core™ i7 processor, Intel® Core™ i5 processor, and
     Intel® Core™ i3 processor)
    AMD (Athlon II Dual-Core Processor, Phenom II, Opteron)
 An output device is any piece of computer
  hardware equipment used to communicate the
  results of data processing
 Devices include
   Headphones/Speakers
   Monitors or Screens
   Printers (laser, ink jet, color laser)
   Projectors
 Storage refers to computer components,
 devices, and recording media that retain
 digital data used for computing over a
 period of time
   Types of storage
      Temporary storage
       (RAM or main memory)
      Permanent storage
       (saved data)
Storage Capacities
 Kilobyte (KB) 1,000 bytes
 Megabyte (MB) 1 million bytes
 Gigabyte (GB) 1 billion bytes
 Terabyte (TB) 1 trillion bytes
 Petabyte (PT) 1 thousand TB

 Today’s hard drives are measured in gigabytes and
 terabytes and you would probably purchase a
 computer with at least a 500 GB hard drive
Temporary Storage
Temporary storage is your RAM—random access memory--
(also known as primary or main memory). This is the
storage area that the computer uses when you boot the
computer. The operating system (OS) and programs you
use are stored in RAM. Documents you type are stored in
RAM until you save them to permanent storage.

Today, if you were to buy RAM for a computer, you would
most likely buy 2 to 4 GB of RAM.

Pictured to the right are examples of RAM
Permanent Storage Devices
So you can access your work later, you typically save work to some
type of permanent storage. There are basically four common types of
storage devices:
 Magnetic disks
     Hard drives
     Floppy drive
     Portable hard drives
 Optical disks
     CDs and DVDs
     Blue ray
 Tape drives
     Zip drive
 Mobile storage devices
     Flash memory
     Memory cards
     iPods
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