COMPUTER UNIT

• SYSTEM UNIT: a case that contains electronic components of the computer used to process data
• INSIDE OF THE SYSTEM UNIT:

  1. Drive Bay
  2. Processor
  3. Memory
  4. Sound cord
  5. Video cord
  6. Power Supply
• POWER SUPPLY: converts the wall outlet AC power into DC power
• UNINTERRUPTIBLE POWER SUPPLY (UPS): device that maintains power in the event of a failure.
• Motherboard: main circuit of the board of the system unit
• Chips: contains integrated circuits
• Processor: also called the central processing unit (CPU), interprets and carries out the basic instructions that operate a computer
• CPU: Contain a control unit and an arithmetic logic unit

  (ALU)
• Control unit: the component of the processor that directs and coordinates most of the operations in the computer
• Arithmetic Logic Unit: performs arithmetic, comparison, and other operations
• STEP BY STEP:

  Fetch: get instruction

  Decode: into binary digits

  Execute: alu will do the computation

  Store:
• Binary digits: language of the computer
• Processor chip: that could cause the chip to burn up
• COOLING COMPONENT:

  1. CPU Fan
  2. Heat sink: absorbs heat
  3. Liquid cooling technology (termal paste)- used to attach cpu and heat sink. also absorbs heat
• Adapter Cards: enhances functions of a component of the system unit and/or provides connections to peripherals.

  • video card
  • sound card
• With "Plug and Play", the computer automatically can configure adapter cards and other peripherals as you install them
• Port: is the point at which a peripheral attaches to or

  communicates with a system unit (sometimes referred

  to as a jack)
• Connector: joins a cable to a port
• USB Port: can connect up to 127 different peripherals together with a single connector
• You can attach multiple peripherals using a single USB port with a USB hub
• Bay: an opening inside the system unit in which you can install additional equipment
• Drive Bay: typically hold disk drives
• INTERNAL CABLES:

  1. Power Cale
  2. Data Cable

  EXTERNAL CABLE:

  1. Used for I/O devices
• Power cable: are used to distribute the electricity form the power supply to the other components.

  • Motherboard power connector
  • SATA Power connector
  • MOLEX Power connector
• Motherboard Power Connector: has either a 20-pin or 24-pin Advanced Technology Extended (ATX) power cable
• Power Supply: has a 4-pin Auxiliary (AUX) connector that is connected to the motherboard
• SATA Power Cable: has 15 pins that is used to connect to hard disk drives, optical disk drives, or any other devices that has SATA power socket
• SATA: Serial Advanced Technology attachemnt
• Molex Power Connector: Drives that do not have a SATA power socket
• DATA Cables: used to connect the drives to the motherboard

  – SATA data cable

  – IDE data cable
• SATA DATA Cable: It has 7 pins to connect drives in the motherboard
• IDE DATA Cable: IDE cables has 34-pin cable used for floppy drives and the 40-pin cable for hard drives and optical drives.
• External cables: are attached or plugged at the back of the system case. These usually include the monitor, keyboard, mouse, USB devices, network and power cable
• FIX NUMBERING:

  3: Use compressed air to blow away dust

  1: Clean your computer or mobile device once or twice a year

  4: Use an antistatic wipe to clean the exterior of the case and a

  cleaning solution and soft cloth to clean the screen

  2: Turn off and unplug your computer or mobile device before

  cleaning it
• The pace of the system clock is called the clock speed, and is measured in gigahertz
• The leading manufacturers of personal computer processor chips are Intel and AMD