M4 Computing - Lesson 3 - How A Computer Works


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M4 Computing - Lesson 3 - How A Computer Works

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M4 Computing - Lesson 3 - How A Computer Works

  1. 1. Lesson 3
  2. 2. <ul><li>This picture displays </li></ul><ul><li>the components inside an average PC. We shall now take a look at each part in more detail. </li></ul>
  3. 3. <ul><li>Central Processor Unit . </li></ul><ul><li>Microprocessor - “Brain” of the computer. </li></ul><ul><li>Everything the computer does is overseen by the CPU. </li></ul><ul><li>Within the CPU is: </li></ul><ul><li>The Control Unit The control unit of the CPU uses electrical signals to tell the entire computer system to carry out, or execute, stored program instructions. </li></ul><ul><li>Like an orchestra leader, the control unit tells other parts of the computer what to do. </li></ul>
  4. 4. <ul><li>This is very fast storage used to hold data. It has to be fast because it connects directly to the microprocessor. There are several specific types of memory in a computer: </li></ul><ul><li>Random-access memory (RAM) - Used to temporarily store information that the computer is currently working with </li></ul><ul><li>Read-only memory (ROM) - A permanent type of memory storage used by the computer for important data that does not change </li></ul><ul><li>Basic input/output system (BIOS) - A type of ROM that is used by the computer to establish basic communication when the computer is first turned on </li></ul>
  5. 5. <ul><li>This is the main circuit board that all of the other internal components connect to. The CPU and memory are usually on the motherboard. </li></ul><ul><li>A sound card can be built into the motherboard or connected through PCI . </li></ul><ul><li>Peripheral Component Interconnect (PCI) Bus - The most common way to connect additional components to the computer, PCI uses a series of slots on the motherboard that PCI cards plug into. </li></ul>
  6. 6. <ul><li>Hard disk - This is large-capacity permanent storage used to hold information such as programs and documents. </li></ul><ul><li>Stores all your software, games, photos, mp3s, videos and saved documents. </li></ul><ul><li>On your computer is usually known as C: drive and sometimes D: </li></ul><ul><li>Modern computers have hard disk drives with memories of 200GB (gigabyte) or more. They can hold thousands of files that can all be accessed in an instant. </li></ul><ul><li>How much memory is </li></ul><ul><li>on your hard drive. Take a look! </li></ul>
  7. 7. <ul><li>These can either be built into the motherboard or plugged into PCI slots on the motherboard. </li></ul><ul><li>Sound card - This is used by the computer to record and play audio by converting analog sound into digital information and back again. </li></ul><ul><li>Graphics card - This translates image data from the computer into a format that can be displayed </li></ul><ul><li>by the monitor. Allows you to </li></ul><ul><li>view movies and play games </li></ul><ul><li>quickly and smoothly. </li></ul><ul><li>Can be upgraded as necessary to </li></ul><ul><li>keep your computer up to date. </li></ul>
  8. 8. <ul><li>You need input devices to tell your computer what you want it to do: </li></ul><ul><li>Mouse, Keyboard, Scanner, Microphone, Modem, CD ROM, DVD ROM, Disk, Memory stick, Touch screen. </li></ul><ul><li>You need output devices to save and view what your computer is doing/ has done for you. </li></ul><ul><li>Monitor, Speakers, Printer, CD, DVD, Disk, Memory Stick. </li></ul>
  9. 9. <ul><li>Choose 2 INPUT devices and 2 OUTPUT devices and give me a short description of how the devices work </li></ul><ul><li>Then give me 3 examples of what we use each of them for… </li></ul><ul><li>Add your finished work to this weeks discussion forum. </li></ul>