Computer System Components
OPTOMETRY · SEMESTER 1 Computer System Components Computer Applications START READING NOTES Contents of This Topic SESSION 02 The System Unit Inside the System Unit? Motherboard Power supply Central processing unit(CPU) Random access memory (RAM) Hard disk drive Adapter cards Optical drives Fan Ports Physical components of Computer System(Hardware) can be categorized into four types: Computer System Components Input devices Some of the popular input devices are: The commonly used Input devices are: Mouse has three parts namely Operations/skills/techniques of using mouse A standard computer Keyboard has 101,105,107 or 108 keys Most keyboards have keys arranged in five groups: Output devices Some of the popular output devices are: Common output devices are: Processing devices CPU Storage devices Examples of Storage Devices: Factors that Impact a Computer’s Performance SESSION 02 UTILIZE BASIC CONCEPTS OF COMPUTER SYSTEM IN OPERATING A COMPUTER The System Unit This is a container that houses most of the electronic components that make a computer system. System unit act as a Computer case Alternatively called a box, main unit, and system box, a system unit is the case containing all the main parts of a computer. Inside the System Unit? Motherboard Power Supply Central Processing Unit (CPU) Random-access Memory (RAM) Hard Disk Drive / Solid State Drive Adapter Cards(Sound card, Video card(Graphic card),Network card Optical Drives Fan Ports Bus (Address bus, I/O bus, Memory bus and CPU bus) Motherboard A motherboard is the main circuit board inside a computer that connects the different parts of a computer together. Power supply A power supply is a component that supplies power inside the computer. Central processing unit(CPU) Is the brain of the computer. Or is the part of the computer that handles all operation on the computer system. Random access memory (RAM) Is a computer's primary(temporary) memory, where the data that the processor is currently using is stored. Store data when computer is ON and loose data when computer is OFF. Hard disk drive Is a computer's long-term memory(permanent memory), where the data are stored. Adapter cards Is a type of computer hardware used to add more functions and capabilities to a computer. Video card Sound card Network card Optical drives Is a computer disk drive that uses laser beam technology to read and write data on optical disks like CDs, DVDs, and BDs (Blu-ray discs) Fan A fan is a hardware device that keeps the overall computer or a computer device cool by circulating air to or from the computer or component Ports A port is a connection or a jack provided on a computer to connect external or peripheral devices to the computer Bus A bus is a communication system that transfers data between components inside a computer, or between computers. Physical components of Computer System(Hardware) can be categorized into four types: Input devices Output devices Processing devices and Storage devices Types of Computer Hardware Computer System Components Remember: All types of computers follow the same basic logical structure and perform the basic operations for converting raw input data into information useful to their users. Input Devices Processing Devices Output Devices Storage Devices Input devices Definition- Are devices that are used to enter data in a computer. Functionality. -To translate data from human understanding form to computer understanding form (Computer Readable form) Some of the popular input devices are: Keyboard Mouse Scanner Joystick Light Pen Digitizer Microphone Magnetic Ink Character Recognition (MICR) Optical Character Reader (OCR) Digital Camera Paddle Steering Wheel Gesture recognition devices Light Gun Touch Pad Remote Touch screen VR Webcam Biometric Devices The commonly used Input devices are: Keyboard Mouse Mouse has three parts namely Left click Right click Scroll Types of the mouse Wired mouse Wireless mouse Optical mouse Operations/skills/techniques of using mouse Point: When you’re told to “point the mouse,” you move the mouse on the desktop, which moves the mouse pointer on the screen to point at something interesting (or not). Click: A click is a press of the mouse button — one press and release of the main button, the one on the left. Clicking is often done to select something or to identify a specific location on the screen. Right-click: This action is the same as a click, although the right mouse button is used to get more commands. Double-click: This one works just like the single click, although you click twice in the same spot — usually, rather rapidly. Drag: The drag operation is done to graphically pick up something on the screen and move it. A standard computer Keyboard has 101,105,107 or 108 keys The layout/Features of the Keyboard Most keyboards have keys arranged in five groups: Function keys Numbering keys Alphabetic keys Symbols/Commanding keys Special keys Output devices Definition – Are devices that are used to give results of the processed information. Functionality Translates data from computer understanding form to human understanding form Some of the popular output devices are: Monitor Printer Headphones Computer Speakers Projector GPS Sound Card Video Card Braille Reader Speech-Generating Device Common output devices are: Printer Monitor Speaker Projector Which are Input Devices and which are Output Devices? Processing devices Definition – Are devices that are used to process data and handle all computer operations. Functionality It handles all operations on the computer system Some of the popular processing devices are: CPU (central processing unit) GPU (graphics processing unit) CPU Function of CPU 1. Fetch: gets an instruction from memory 2. Decode: decides/interpret what the instruction means 3. Execute: performs the instruction Storage devices Definition – Are devices that are used to store data and all programs. This devices act as Computer Memory Types of Computer Memory: Primary Memory (Main memory) Is the memory that holds data, programs and instructions that are currently in use. Secondary Memory Computer memory that stores data and programs permanent. Examples of Storage Devices: One that act as Primary memory: Read only memory (ROM) Random access memory (RAM) One that act as Secondary memory: Magnetic Tape Hard Disk drive Optical Storage i.e CD and DVD Solid State