M4 Computing - How a computer works


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Lesson 3 - How a computer works

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M4 Computing - How a computer works

  1. 1. Lesson 3<br />How a computer works<br />
  2. 2. This picture displays<br />the components inside an average PC. We shall now take a look at each part in more detail.<br />Inside a PC<br />
  3. 3. CPU<br /> Central Processor Unit.<br /><ul><li>Microprocessor - “Brain” of the computer.
  4. 4. Everything the computer does is overseen by the CPU.</li></ul> Within the CPU is:<br /> The Control UnitThe control unit of the CPU uses electrical signals to tell the entire computer system to carry out, or execute, stored program instructions. <br /> Like an orchestra leader, the control unit tells other parts of the computer what to do. <br />
  5. 5. Memory<br />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:<br />Random-access memory (RAM) - Used to temporarily store information that the computer is currently working with <br />Read-only memory (ROM) - A permanent type of memory storage used by the computer for important data that does not change <br />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 <br />
  6. 6. Motherboard and PCI slots<br />This is the main circuit board that all of the other internal components connect to. The CPU and memory are usually on the motherboard. <br />A sound card can be built into the motherboard or connected through PCI. <br />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. <br />
  7. 7. Hard Disk Drive<br />Hard disk - This is large-capacity permanent storage used to hold information such as programs and documents.<br />Stores all your software, games, photos, mp3s, videos and saved documents.<br />On your computer is usually known as C: drive and sometimes D:<br />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.<br />How much memory is <br /> on your hard drive. Take a look!<br />
  8. 8. Sounds and Graphics cards<br /><ul><li>These can either be built into the motherboard or plugged into PCI slots on the motherboard.
  9. 9. Sound card - This is used by the computer to record and play audio by converting analog sound into digital information and back again.
  10. 10. Graphics card - This translates image data from the computer into a format that can be displayed
  11. 11. by the monitor. Allows you to
  12. 12. view movies and play games </li></ul> quickly and smoothly.<br /><ul><li>Can be upgraded as necessary to </li></ul> keep your computer up to date.<br />
  13. 13. Input / Output devices<br />You need input devices to tell your computer what you want it to do: <br /> Mouse, Keyboard, Scanner, Microphone, Modem, CD ROM, DVD ROM, Disk, Memory stick, Touch screen.<br />You need output devices to save and view what your computer is doing/ has done for you.<br /> Monitor, Speakers, Printer, CD, DVD, Disk, Memory Stick.<br />
  14. 14. Task for today<br />Choose 2 INPUT devices and 2 OUTPUT devices and give me a short description of how the devices work<br />Then give me 3 examples of what we use each of them for…<br />Create a blog on the school website and share the information with your friends. Please include some pictures!<br />