Tle 2

• Computer


  An electronic device that manipulates information, or "data"
• Computer


  • Can store, retrieve, and process data
  • Can be used for typing documents, sending email, browsing the internet, handling spreadsheets, accounting, database management, presentations, games, and more
• Hardware


  Any part of your computer that has a physical structure, such as the computer monitor or keyboard
• Software


  Any set of instructions that tells the hardware what to do
• The first electronic computer, the Electronic Numerical Integrator and Computer (ENIAC), was developed in 1946. It took up 1,800 square feet and weighed 30 tons.
• Types of computers


  • Desktop computers
  • Laptop
  • Server
  • Tablet computers
  • Mobile phones
  • Game consoles
  • Smart TV
• Desktop computers


  Designed for use at a desk or table, typically larger and more powerful than other types of personal computers, made up of separate components including the system unit, monitor, mouse, and keyboard
• Laptop


  Battery or AC-powered personal computer that are more portable than desktop computers, allowing you to use them almost anywhere
• Server


  A computer that "serves up" information to other computers on a network
• Tablet computers


  Use a touch-sensitive screen for typing and navigation, more portable than laptops
• Mobile phones


  Many can do a lot of things a computer can do, such as browsing the internet or playing games, often called smartphones
• Game consoles


  Specialized kind of computer used for playing video games, may allow non-gaming tasks like browsing the internet
• Smart TV


  TV displays that include applications (apps) to access various types of online content
• Personal computer styles


  • PC
  • Mac
• PC


  Began with the original IBM PC introduced in 1981, now the most common type of personal computer, typically includes the Microsoft Windows operating system
• Mac


  Macintosh computer introduced in 1984, first widely sold personal computer with a Graphical User Interface, almost always uses the Mac OS X operating system
• System unit


  The core of a computer system, contains electronic components that process information including the central processing unit (CPU) and random access memory (RAM)
• Mouse


  Used to interact with items on your computer screen, can move objects, open them, change them, throw them away, and perform other actions by pointing and clicking

  
• Types of mouse


  • Mouse ball
  • Optical
  • Trackball
  • TrackPoint/AccuPoint
  • Touchpads
  • Scroll wheel
  • Wireless
  • PS/2

  
• Monitor


  Displays images sent from the computer's video circuits
• Monitor types


  • CRT (cathode ray tube)
  • LCD (liquid crystal display)
  • Quantum dot LED
  • OLED (organic light emitting diode)
  • LED (light emitting diode)
• Keyboard


  The main way to enter information into your computer, can also be used to control the computer through keyboard commands
• Keyboard key groups


  • Typing (alphanumeric) keys
  • Control keys
  • Function keys
  • Navigation keys
  • Numeric keypad

  
• Keyboard comes with three ports supported technology USB, PS2, and Wireless
• Specialized keyboard keys require special drivers, those keys won't work until you install the keyboard's bundled software
• Wireless keyboards bear no cords, making for tidy desktops, but are battery hogs
• Speakers


  Used to play sound, can be built into the system unit or connected with cables
• Modem


  Needed to connect your computer to the Internet
• Arrow keys, Home, End, Page Up, Page Down, Delete, Insert

  Keys used for moving around in documents or webpages and editing text
• Numeric keypad


  Handy for entering numbers quickly, grouped together in a block like a calculator
• Keyboard ports


  • USB
  • PS2
  • Wireless
• Specialized keyboard keys require special drivers. Those specialized keys won't work until you install the keyboard's bundled software
• Wireless keyboards


  Bear no cords, making for tidy desktops. Most come in two parts: the keyboard and a receiving unit, which plugs into your PC's USB part. Unfortunately, they're battery hogs
• Speakers


  Used to play sound, can be built into the system unit or connected with cables. Allow you to listen to music and hear sound effects from your computer
• Modem


  Device that sends and receives computer information over a telephone line or high-speed cable. Sometimes built into the system unit, but higher-speed modems are usually separate components
• Printer types


  • Inkjet
  • Laser
  • All-in-one (AIO)
  • Photo Printer
• Inkjet printers


  Popular for their low price and high quality, squirt ink onto a page, creating surprisingly realistic images in color or black and white
• Laser printers

  Use technology similar to copy machines, they sear images into the paper with toner. Black-and-white laser printers cost a little more than inkjet printers; double that price for color laser printers. Although laser printers can't print digital photos, they're cheaper in the long run for general office paperwork
• Laser printers are supposed to heat up. That's why you shouldn't keep dust covers on laser printers when they're running. If you don't allow for plenty of air ventilation, your laser printer might overheat. After you're through using your laser printer, let it cool off; then put on the dust cover to keep out lint and small insects
• All-in-one (AIO) printers


  Popular with small offices, this type of printer combines a laser or inkjet printer, copy machine, scanner, and a fax machine into one compact package