HISTORICAL DEVELOPMENT OF COMPUTING DEVICES The origin of computers dates back to when our fore fathers used their early calculating devices to count. For example Counting with fingers and toes: calculations were done by our fore fathers with their toes and fingers before the invention of computers. Counting with pebbles: when counting with fingers became […]
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Word processing is the art of using computer to type and edit text and graphics in letters, reports, term papers etc. To perform word processing you need a computer set and software called word processor. Word processor enables you to create letter, term paper, newsletter, memo etc and stores those documents electronically on a
PRINTER There are three types of computer printers: Inkjet: Inkjet printers spray a jet of special ink on the surface to create an ink under control of electric field. Ink jet is used where the volume of print out is not very large. Dot matrix: A Dot matrix printer has a print head that has
OUTPUT DEVICES Computer output device is a device that releases the processed data from the computer to either the user or any of the storage devices. There are many devices that produce data in different forms such as audio, Visual and hard copy. Computer output devices are type of peripheral devices connected to a computer,
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HISTORICAL DEVELOPMENT OF COMPUTING DEVICES 2 (PRE COMPUTER AGE TO 19TH CENTURY) JACQUARD’S LOOM (FEATURES, COMPONENT AND USES) The Jacquard loom is a mechanical loom, invented by Joseph Marie Jacquard in 1801. This loom simplifies the process of manufacturing textiles with complex patterns such as brocade, damask and matelassé. The loom is controlled by punched
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MEANING OF DATA Raw facts or entity which no meaning has been attached to because it has not been processed is referred to as DATA. Data could be facts about people, places, things and their activities. When data passes through some manipulation activities in order to organize them to be meaningful or to achieve a
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An Input Device is any computer hardware equipment used to feed or send data into the main storage of a computer for processing. Many input devices can be classified into two: Ø Modality of input( e.g mechanical motion, audio, visual etc) Ø The input is discrete (keyboard) or continuous (mouse’s position) TYPES OF INPUT DEVICES
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Sections of the Keyboard The Keyboard is divided into five sections; I. Alphanumeric keys( Alphabet and Numbers): consist of alphabet (a-z) and numbers (0-9) II. Function keys F1-f12: they are twelve in number f1-F12 and are located horizontally on the first row of the enhanced keyboards. On standard keyboard they are labeled F1-F10 III. Control
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BOOTING Booting is a process that starts operating system when the user turns on the computer. Steps in booting a Computer: Put on the switch on the main socket to supply power to the system. Switch on the voltage regulator( known as stabilizer) Switch on the UPS Switch on the monitor before the system unit
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ATOMS AND MOLECULES Matter is made up of discrete particles. The main ones are atoms, molecules, and ions. An atom is the smallest part of an element which can take part in a chemical reaction. A molecule is the smallest particle of a substance that can exist alone and still retains the chemical properties of
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A computer is a special multi-purpose electronic device (Machine) that is capable of receiving instruction (data), storing and processing it and giving a desire result as output accurately at an incredibly high speed. The computer as a system is made up of the following: 1. Hardware 2. Software HARDWARE Refers to the physical units
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LOGIC EQUATIONS Aside representing the functioning of a logic gate with truth table and grammatical definition, the use of logic equations can be used not only to represent logic gates and circuits, but also with the usage of some theorems and equivalences, to reduce the number of terms involved, simplifying the equation. In logic equation
Computer Hardware This is the collection of physical elements that constitutes a computer system. Computer hardware refers to the physical parts or components of a computer such the monitor, mouse, keyboard, computer data storage, hard drive disk (HDD), system unit (graphic cards, sound cards, memory, motherboard and chips), etc. all of which are physical objects
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HISTORICAL DEVELOPMENT OF COMPUTING DEVICES( 20th Century) These generations of computers witnessed the first set of computers that used vacuum tubes for circuitry and magnetic drum for memory and were very big taking up the whole room. They were very expensive to use and in addition made use of lot of heat. The heat generated
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The main objective of the CPU is to perform mathematical calculations on binary numbers; still there are other goals of using CPU as well. The CPU comprises many hardware components like motherboard and circuits. A central processing unit (CPU) is the hardware within a computer that carries out the instructions of a computer program by performing the basic arithmetical, logical, control, and input/output operations of the system.
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As mentioned in our previous lesson some important application area of ICT are: Video Conferencing Tele conferencing Tele Presence Tele Communicating and Network Tele Computing Messaging Information Search, retrieval and archival Video Conferencing This is a technology whereby two or more people at different locations can see and hear each other at the
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ICT BASED GADGETS ARE THE FOLLOWING Mobile phones Computer Fax machines Automated Teller Machine Dispensing machines Point of Sales Machine-Automated Cash Register(ACR) Radio sets Television sets Mobile Phones: A mobile phone is an electronic device for making calls across a wide geographical area. It is also called cell phones or hand phone. Computer: This
A flow chart helps in showing the sequence of different approaches in solving a problem. Flow chart is very concise in nature. It identifies steps needed in solving a problem and shows these steps with connecting lines and arrows to indicate the order in which the steps are performed. FLOWCHARTING SYMBOLS
LOGIC GATES A logic gate is an elementary building block of a digital circuit. Most Logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary condition low (0) or high (1). The logic gate of a terminal can, and generally change often, as the
TYPES OF TOOL BARS There are two types of tool bars in word processor a) Standard tool bar b) Formatting Toolbar Using the Microsoft Word steps a) Click the start button to bring start menu b) From the pull down menu click on Microsoft word Creating a New document Creating a new document is a
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