1-Introduction to Computer Skills.pptx

Computer Skills Chapter 1: 1 Introduction to Computer 2 Computer  A computer is an electronic device, operating under the control of instructions stored in its own memory that can accept data (input), process the data according to specified rules,...

Computer Skills Chapter 1: 1 Introduction to Computer 2 Computer  A computer is an electronic device, operating under the control of instructions stored in its own memory that can accept data (input), process the data according to specified rules, produce information (output), and store the information for future use 3 Functionalities of a computer Any digital computer carries out five functions in gross terms:  Takes data as input.  Stores the data/instructions in its memory and use them when required.  Processes the data and converts it into useful information.  Generates the output  Controls all the above four steps  Functionalities of a computer(Contd.) 4 Processing Data Information 5 Computer Components  Hardware  Software 6 Hardware  Computer hardware is the collection of physical elements”Tangible objects”  that constitutes a computer system.  The actual machinery, wires, transistors, and circuits … etc. 7 Hardware: 8 Software  Computer Programs  instructions and data 9 Computer Units 1.Input Unit 2.Central processing Unit 3.Primary Memory Unit 4.Secondary storage Unit 5.Output Unit 10 Input Devices  Input device is any peripheral (piece of computer hardware equipment to provide data and control signals to an information processing system such as a computer or other information appliance.  Input device Translate data from form that humans understand to one that the computer can work with. Most common are keyboard and mouse 11 Computer Units 12 Input Devices 13 Example of Input Devices Keyboard Mouse (pointing device) Microphone Touch screen Scanner Webcam Touchpads MIDI keyboard Graphics Tablets Cameras Pen Input Video Capture Hardware Microphone Trackballs Barcode reader Digital camera Joystick Gamepad Electronic Whiteboard Note: The most common use keyboard is the QWERTY keyboard. Generally standard Keyboard has 104 keys 14 Central Processing Unit  CPU  known as microprocessor or processor  It is responsible for all functions and processes 15 CPU Components  The CPU is comprised of three main parts 1. ALU (Arithmetic Logic Unit) 2. Control Unit (CU) 3. Registers: Stores the data that is to be executed next. 16 ALU  Executes all arithmetic and logical operations.  Arithmetic calculations like as addition, subtraction, multiplication and division.  Logical operation like compare numbers, letters, or special characters 17 Control Unit (CU) Control Unit (CU): controls and co-ordinates computer components.  Read the code for the next instruction to be executed.  Increment the program counter so it points to the next instruction.  Read whatever data the instruction requires from cells in memory.  Provide the necessary data to an ALU or register.  If the instruction requires an ALU or specialized hardware to complete, instruct the hardware to perform the requested operation. 18 Registers  Registers: Stores the data that is to be executed next, "very fast storage area". 19 Primary Memory  1. RAM.  2.ROM 20 Primary Memory 1. RAM: Random Access Memory: is a memory scheme within the computer system responsible for storing data on a temporary basis, so that it can be promptly accessed by the processor as and when needed.  It is volatile in nature, which means that data will be erased once supply to the storage device is turned off.  RAM stores data randomly and the processor accesses these data randomly from the RAM storage.  RAM is considered "random access" because you can access any memory cell directly if you know the row and column that intersect at that cell. 21 Primary Memory 2. ROM (Read Only Memory): ROM is a permanent form of storage. ROM stays active regardless of whether power supply to it is turned on or off. ROM devices do not allow data stored on them to be modified. 22 Secondary Memory  Stores data and programs permanently  its retained after the power is turned off  Main Examples 1. Hard Disk 2. Optical Disk 3. Flash memory 23 Hard Disk  Called Disk drive or HDD  stores and provides relatively quick access to large amounts of data.  Stores data on an electromagnetically charged surface or set of surfaces. 24 Optical Disk & Flash  an optical disc drive (ODD) is a disk drive that uses laser light to store data.  There are three main types of optical media: CD, DVD, and Blu-ray disc CD “Compact Disk” can store up to 700MB DVD “ Digital Video Disk “ can store up to 8.4 GB Blu-ray disc. can store up to 50 GB 25 3. Flash Disk  A storage module made of flash memory chips. A Flash disks have no mechanical platters or access arms, but the term "disk" is used because the data are accessed as if they were on a hard drive. The disk storage structure is emulated. 26 RAM V.s Hard Disk  What are the differences between RAM as a main memory and HDD as a Secondary Memory. 27 RAM V.s Hard Disk 28 Output Unit  An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer)  converts the electronically generated information into human-readable form. 29 Output devices Examples Monitor LCD Projection Panels Printers (all types) Computer Output Microfilm (COM) Plotters Speaker(s) Projector 30 Output devices Examples 1. A monitor CRT: Cathode Ray Tube LCD: Liquid crystal display most familiar these days 31 Output devices Examples 2. Printer:  transfers data from a computer onto paper Printer types: 1-Laser Printer. 2-Ink Jet Printer. 3-Dot Matrix Printer 32 Software  Software is a generic term for organized collections of computer data and instructions, often broken into two major categories two major categories: 1. system software 2. application software 33 System software  Known as Operating System  is responsible for controlling, integrating, and managing the individual hardware components of a computer system  Windows is an example of OS.  example of System Software:  1) Microsoft Windows  2) Linux  3) Unix  4) Mac OSX  5) DOS 34 Application software  is used to accomplish specific tasks other than just running the computer system.  It may consist of:  a single program, such as an image viewer;  a small collection of programs (often called a software package) that work closely together to accomplish a task, such as a spreadsheet or text processing system;  a larger collection (often called a software suite) of related but independent programs and packages that have a common user interface or shared data format, such as Microsoft Office, 35 Unit of Measurements - Storage Storage Units Bit BIT 0 or 1 Byte B 8 bits Kilobyte KB 1024 bytes Megabyte MB 1024 kilobytes Gigabyte GB 1024 megabytes Terabyte TB 1024 gigabytes 36 Size example 1 bit - answer to an yes/no question 1 byte - a number from 0 to 255. 90 bytes: enough to store a typical line of text from a book. 4 KB: about one page of text. 120 KB: the text of a typical pocket book 3 MB - a three minute song (128k bitrate) 650-900 MB - an CD-ROM 1 GB -114 minutes of uncompressed CD-quality audio at 1.4 Mbit/s 8 -16 GB - size of a normal flash drive 37  A. 10B is equivalent 10 * 8 = 80 bits  B. 3MB is equivalent to how many Bits?  Answer: 3 *1024 = 3072 KB 3072*1024 = 3145728 B 3145728 * 8 = 25165824 bits 38 Unit of Measurement -Speed  The speed of CPU measured by unit called Hertz (Hz)  1 Hz represent 1 cycle per second.  The speed of CPU is known as Computer Speed. 39 Unit of Measurement -Speed CPU SPEED MEASURES 1 hertz or Hz 1 cycle per second 1 MHz 1 million cycles per second or 1000 Hz 1 GHz 1 billion cycles per second or 1000 MHz 40 Computer Classification  Computers can be classified by size and power to: 1. Personal computer (PCs) 2. Workstation: 3. Minicomputer 4. Mainframe: 5. SuperComputer 41 Computer Classification  Personal computer (PCs): a small, single-user computer based on a microprocessor. In addition to the microprocessor, a personal computer has a keyboard for entering data, a monitor for displaying information, and a storage device for saving data.  Workstation: a powerful, single-user computer. A workstation is like a personal computer, but it has a more powerful microprocessor and a higher-quality monitor. 42 Computer Classification  Minicomputer: multi-user computer capable of supporting from 10 to hundreds of users simultaneously.  Mainframe: powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously.  Supercomputer: an extremely fast computer that can perform hundreds of millions of instructions per second. 43 Computer Classification  Compare between the previous type of computers based on  Price  Processing Speed  Storage Capacity  Powerful  Single-user or Multi-user  Computer Size  Companies size 44 Laptop computer  is a portable computer.  personal computer that can be easily carried and used in a variety of locations.  run the same software and applications in PCs 45 Netbook Computer  A netbook is a type of laptop that is designed to be even more portable.  Cheaper and less powerful than laptops or desktops.  They are generally less powerful than other types of computers, but they provide enough power for email and internet access, which is where the name "netbook" comes from. 46 Mobile Devices  A mobile device is basically any handheld computer.  It is designed to be extremely portable.  Some mobile devices are more powerful  Types: 1.Tablet Computers 2.Smartphones 47 Tablet Computers  designed to be portable.  The most obvious difference is that tablet computers don't have keyboards or touchpads.  Best used for tasks like web browsing, watching videos, reading e- books, and playing games. 48 Tablet Computers  The most obvious difference is that tablet computers don't have keyboards or touchpads. Instead, the entire screen is touch-sensitive, allowing you to type on a virtual keyboard and use your finger as a mouse pointer.  Tablet computers are mostly designed for consuming media, and they are optimized for tasks like web browsing, watching videos, reading e-books, and playing games 49 Smartphones  a powerful mobile phone  designed to run a variety of applications in addition to phone service.  Compare it with the tablet?  Internet access is an important feature of smartphones. (3G or 4G)(Wi-Fi Service) 50 Data, Information and Knowledge  Data:  Facts and figures which relay something specific  but which are not organized in any way and which provide no further information regarding patterns  unstructured facts and figures 51 Data, Information and Knowledge  Information:  For data to become information, it must be contextualized, categorized, calculated and condensed. (Processing)  it is data with relevance and purpose. 52 Data, Information and Knowledge  Knowledge:  Knowledge is closely linked to doing and implies know-how and understanding.  Processing Information 53 Data, Information and Knowledge  Data: symbols  Information: data that are processed to be useful; provides answers to "who", "what", "where", and "when" questions  Knowledge: application of data and information; answers "how" questions 54 Data, Information and Knowledge 55 Data, Information and Knowledge  Processing data produces information, and processing information produces knowledge.