Computers

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Computers

  1. 1. Definition of a Computer• A computer is an device that receives information (input), processes information, and outputs information• input/output device that processes information
  2. 2. Essential Parts• Box - Central Processing Unit (CPU)• Monitor - main output device• Keyboard - main input device• Mouse – optional input device
  3. 3. The Box (CPU)• All processing goes through the box• A simple input/output (I/O) device• Ports on back for connection of input and output devices• Disk drives on front for storage I/O• Processor – e.g. Pentium IV• Memory – e.g. 256 MB RAM• Storage – e.g. Hard Drive, CD-RW• Slots & Cards
  4. 4. Input Devices• Human input devices – Allow person to send data to the computer – Keyboard – Mouse (and other pointing devices)• Machine-readable input devices – Send data directly to computer without human involvement – No human involvement means no human error – Usually faster than human input
  5. 5. Input Output DevicesInput Devices Machine Readable• Keyboard • CPU (The Box)• Scanner • Hard Drive• CD-ROM • Floppy DriveOutput Device • Modem• Digital Camera • CD Writer/Burner• LCD Projector • Network Card• Laser Pointer • Bluetooth Card• Speakers• Monitor• Printer
  6. 6. Input: MiceStandard Two-Button: Leftbutton for selecting, right buttonfor propertiesWheeled Mouse - Wheel forscrollingTrackball - Inverted mouseTouchpad - Touch/tap sensitive“Eraser”/Joystick
  7. 7. Output: Types of Monitors• Cathode Ray Tube (CRT) - standard monitor, inexpensive, good resolution, good pixel size• Flat Panel (Liquid Crystal Display - LCD) – more expensive, prices dropping
  8. 8. Hard Disk Drives and Direct Access
  9. 9. Thank You
  10. 10. Unit Description Approximate Size1 bit 1 binary digit1 nibble 4 bits1 byte 8 bits 1 character1 kilobyte 1,024 bytes ≈1/2 page1 megabyte 1,048,576 bytes ≈500,000 pages 1 million bytes1 gigabyte 1,073,741,824 bytes ≈5 million pages 1 billion bytes1 terabyte 1 trillion bytes ≈5 billion pages 2000 CD’s1 Petabyte 1,125,899,906,842,624 Bytes 1,60,000 DVD’s1 Exabyte 1,152,921,504,606,846,976 Bytes ½ the amount of data generated world wide in a year1 Zettabyte 1,180,591,620,717,411,303,424 Bytes As much data as grains of sand on all the world beachesYottabyte 1,208,925,819,614,629,174,706,176 Bytes As much as the no of atoms in two table spoons of water

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