SS 1 Computer Studies (1st, 2nd & 3rd Term)

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

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

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,

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

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

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

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

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

Definition of Computer hardware This refers to the physical units or components which make up the computer configuration. The term hardware refers to the tangible parts of a computer that can be seen and touched. Examples of hardware components Monitor Motherboard CPU( Central Processing Unit) RAM( Random Access Memory) Expansion Cards Power Supply Optical Disk

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

These are gates that are formed from combination of two logic gates. There are two types of alternative logic gate: NAND GATE A NAND gate is the combination of an AND gate and NOT gate. It operates the same as an AND gate but the output will be opposite. Remember, the NOT gate does not

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

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

Differences between primary and secondary memory Primary storage devices Secondary storage devices 1 These devices are temporary. These devices are permanent. 2 These devices are expensive. These devices are cheaper. 3 These devices are faster, therefore expensive. These devices connect via cables and are slow, therefore cheaper. 4 These devices have less storage capacity. These

SECONDARY MEMORY Secondary memory or storage is the non – volatile memory that stored externally from the computer. A secondary – storage medium is usually used for the storage of large amount of data or for permanent or long – time storage of data or programs. It is also used for storing backups. Secondary storage

 Memory is the part of the computer that holds data and instructions for processing. It stores program and instructions or data for only as long as the program they pertain to is in operation.   TYPES OF MEMORY a.    Primary Memory b.   Secondary Memory   (a) PRIMARY MEMORY This is the memory that can be

 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.

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