Download and listen to this wonderful song for Chief Willie Mmaduabuchukwu Obiano (Akpokuo Dike Global) by three Flora Azikiwe Model Comprehensive Secondary School Neni, Anaocha L.G.A, Anambra State. the song was titled "Willie Ga-achi anyi ozo"
Download here
OUR INFO
19 Aug 2017
19 Jan 2017
D'face Your love ft Bryan
A new artist is born, "D'face" with his new track "Your love" featuring by "Bryan" and was produced by "ENDLESS". The track was released on thursday 12th January, 2017.
Download the Mp3 track here. or the link below.
9 Dec 2016
THE WORD "COMPUTER"
THE WORD "COMPUTER"
DEFINITION
OF COMPUTER
ü It
is a programmable machine designed to automatically carry out a sequence of
arithmetic or logical operations.
ü It
is also an electronic device for processing information.
ü Computer
is an electronic machine that is capable of accepting data, processing data and
brings out the result as information.
ü Computer
is also an idiot machine, because it cannot work by its power.
DEFINITION
OF TERMS
v Raw Data:
It is a raw fact or unprocessed information that is yet to be processed.
v Electronic Device:
Computer is regarded as an electronic device because the concept used in
construction of computer is similar to the one used in construction of TV and
Radio
v Programs:
They are the instructions that directs the computer on what to do, when to do
it and how it should be done.
v Input:
It is keying in data into the computer system using the input device.
v Output:
It is information brought out from the computer.
v Process:
It is the act of processing data in order to get it ready for use.
v Storage:
It is the act of keeping data for future use.
CHARACTERISTICS
OF COMPUTER
v STORAGE CAPABILITY: a
computer has the ability to store a large data or information which can be
retrieved at any point in time.
v SPEED OF OPERATION: a
computer has the ability to operate at a very high speed while processing data
or information.
v ACCURACY OF RESULT:
this is the ability or quality to produce result. That is to say that computer
provides correct result during operate and cannot give inaccurate result. The
operational jargon in computer is called Garbage in-Garbage out (GIGO), this
means that computer’s output depends on the input.
v VERSATILITY IN APPLICATION:
a computer has the quality of being used, operating, directing and controlling
many things.
CLASSIFICATIONS
OF COMPUTER
Computer is classified into three
namely;
·
Generations of computer
·
Size of the body
·
Classification based on mode of
operation
Ø GENERATION OF
COMPUTER; There
are various generation
of computer that have been
recorded. we have five
generation of computer
produced between 1946
till date.

FEATURES
v It
was developed with an electronic valve called vacuum tubes.
v It was
slow in operation
v It was
large in size
v It
generates a lot of heat. E.g; Automatic Computer Engine [ACE], Electrical
Numerical Integrated and calculation.

FEATURES
v It was
developed with a component called transistor.
v It makes
use of high
languages.
v It possesses
higher speed in
operation.
v It
consumes less electricity. Eg.IBM
7070,ATLAS .ETC

FEATURES
v It
works with integrated circuit(IC).
v They are
more powerful and
reliable than that
of first generation computers.
v It
was expensive.
v It
gives rise to more development in hardware technology.
v It
was second to the highest point of computer development in the standard form,
then.

FEATURES
v It made
use of chip
called micro processor
as memory.
v It
leads to the standard use of software.
v It
was more compact and portable.

FEATURES
v It
makes use of logical intelligence and artificial intelligence.
v It
process data in million cycles per second.
v Examples
are Robot, pentium3, pentium4, duarcore, e.t.c.
CLASSIFICATION OF
COMPUTER BASED ON THE SIZE OF BODY OR WORK DONE.
v Mainframe
v Mini
computer
v Micro
computer
·
MAIN
FRAME
It is biggest and powerful of all the computers.
It can perform complex work but it takes time, which is to say that the
computer is slow. It uses vacuum tubes and big electronic component and it is
as big as a house and very costly. It is mainly used by a big organization like
NEPA, NITEL, communication centers or media that is a radio station .etc it
generates a lot of heat and requires a cooling system for proper functioning.
·
MINI
COMPUTER
It is a scaled down version of
mainframe. It was introduced in 1965 and it belongs to the third generation of
computers it possesses all the attribute of mainframe of computer but has a
smaller storage capacity and costless when idea compelled with mainframe
computer .It was all computer. It uses electronic instead of transistors and capacitors
·
MICRO
COMPUTER
It is the latest in
the development of computer. It can be seen as individual types of computer it
is the smallest computer technology. It has C.P.U. (processor) and a small chip
called an intelligent circuit (IC) it has capacitors/resistor as its components
and the are very small not like vacuum tube.
CHARACTERISTICS
v It
is faster than above mentioned
v It
is durable and portable
v It
is cheap and generate less heat
TYPES OF MICRO COMPUTER
v Desktop
micro computer
v Laptop
micro computer
v Palmtop
micro computer
v Notebook
micro computer
ü DESKTOP
It is the type of computer usually
placed on the desk while operating.
Types
of micro-Desktop computer
o
Desk PRO.
o
Full tower or tower computer.
o
Mini tower.
Full
tower: they are the type of desktop that the height of the C.P.U is
higher than the monitor.
Minitower:
they are the type that has the same height with the C.P.U and
the monitor.
Palm-top:
it is usually carried on palm while operating and the structure looks like
calculator.
CLASSIFICATION
OF BASED ON MODE OF OPERATION
Ø Analogue
computer
Ø Digital
computer
Ø Hybrid
computer.
ANALOGUE COMPUTER
It is the type of computer that makes
use of district variables. It does not have memory facilities it works with
respond to pressure or waves vibration, it processes data in continuous signals.
E.g; car speedometer, thermometer, measuring scale, fuel pump, analogue wrist
watch, e.t.c.
DIGITAL COMPUTER
It is the type of computer that does
not change with time, it provides accurate result it is a computer that
processes data or information at a descript values of 0-9. E.g; calculator,
computer keyboard, telephone keypad, e.t.c.
HYBRID
It is the type of computer that
combines the features of analogue and digital computer, so we can say that it
is the type of computer that can handle the analogue and digital at the same
time hyper. E.g; stimulate guided missile system, modern designed aircraft.
E.t.c.
BASIC
ELEMENT OF COMPUTER
o
HARDWARE
o
SOFTWARE

They are the physical component of a
computer that is touchable and visible to handle e.g. system unit, monitor,
keyboard, mouse, mother board, RAM and other peripherals.
COMPONENTS OF THE HARDWARE
v SYSTEM
UNIT
v INPUT
DEVICES
v OUTPUT
DEVICES
v STORAGE
DEVICES
SYSTEM UNIT
It is the unit that helps the system to
manipulate. They are C.P.U, power supply unit and drives.
C.P.U
It is the basic unit of a computer that
sends signals to input and output system, it is called brain or central coordinator.
C.P.U
consists the following;




PROCESSOR
UNIT
It is very small
component that direct the activity of computer .it is the component that direct
and control the system before sending the data to the output.
MEMORY
UNIT
It is where the
computer stores information.
INPUT
DEVICE
It is where human
readable languages are converted into computer readable language. It can also
be seen as the process of entering data in the system. E.g; keyboard, scanning
machine, mouse, memory card and the entire removable storage device.
OUTPUT DEVICE
It is where the computer readable language is converted into
human readable language.it where already prepared information is brought out
from the computer system E.g. Monitor, printer, speaker, e.t.c.
v
MONITOR:
it one of the output devices which display all the information/ data performed
in the computer system. It is called Visual Display Unit (VDU).
Types
1.
Monochrome:
black and white
2.
Colored
monitor: it displays many colors.
COLORED
TYPES
1. Enhance graphic
adapter.
2. Video graphic adapter
(VGA).
3. Super video
graphic adapter (SVGA)
v
PRINTER:
it is the out put devices that are used to print out data or information in a
hard copy.
Types of printer
1.
Low
speed: it is the type of printer that prints data slowly e.g;
impact, ink jet e.t.c.
2.
High
speed printer: that is the type that prints when
given a command. example, line printer, laser jet printer.
v
SPEAKER:
it helps on bringing out sound in computer when it is being connected to the
system.
v
STORAGE
DEVICES: It is used in storing data/information for future use
TYPES OF STORAGE DEVICES
PRIMARY
MEMORY: it is where data are kept temporary inside the computer
during or before processing.
TYPES PRIMARY MEMORY


v RAM; it is where all the
apps, programs, and data are stored during processing. It is volatile in nature
which means (if there is a power failure the information can be lost or wiped
out.
v
ROM;
it is where data is stored permanently. It is not volatile which means (if
there is a power failure, the information can’t be wiped out or alter the
content inside it.
SECONDARY MEMORY:
They are computer memory that receives information or instruction for permanent
storage. E.g. Hard disk drives, floppy disk drive, compact disk ROM, flash
drive, Memory card.
SOFTWARE
It is a set of
instruction that direct the activities of computer system in order to achieve a
specific task. It is also a written program, designed to meet the essential
need of the user.
TYPES OF SOFTWARE
v System
software
v Application
software.
SYSTEM SOFTWARE
It
is a program that generally control or coordinate the activities of the
computer system. It also provides the environment for the smooth running of the
application software. Examples are operating system software and utility
programs.
APPLICATION SOFTWARE
These
are software developed to accomplish a specific task. They are called
application software because they apply to the computer wath ever the user
wants. It enables the user to solve problems like typing, designing, analyse
numbers. e.t.c.
TYPES
OF APPLICATION SOFTWARE
v WORD PROCESSING PACKAGE:
it allows the users to create, edit, and print text based document. E.g;
Microsoft-word, word star, Microsoft perfect, VC-Read, e.t.c
v ELECTRONIC SPREAD SHEET:
it allows the users to work with raws and columbs of a data.it help to solve
prombles that requires comparism, projection and calculation Example, Microsoft
excel, Lotus 123, Quattro PRO e.t.c.
v GRAPHICS:
it is grouped into three;
A Presentation graphic software:
it is use to crease graphic based on data electronic spread sheet. E.g;
PowerPoint.
B Illustration
Graphic software: it enable the user to inllustration
design and produce art worth like calendars, invitation cards, jotter, e.t.c.
Example; CorelDraw.
C Computer Aided design:
they are software that are used by architectures and engineer to produce
technical and detailed drawing of a building plan, elevation of bridge, e.t.c.
Example; AUTO-CAD, AUTO-SKETCH, e.t.c
COMPUTER
VIRUS
It is a written program design to replicate and stays on its
own which minder the efficiency of the computer system and damage the system
soft ware. It can also be used purposely to fight against piracy.
TYPES OF COMPUTER VIRUS


COMMON
VIRUS
v Brain
virus
v Cookies
v Scores
v P.C
stone/ marijuana
v Madonna
v Aids
v Randrops
v Data
crime
v Friday
the 13th
v Happly
birth day
v Jerusalem
v Avenger
v November
17th00, e.t.c
PREVENTIVE
MEASURES
v Ensure that system has anti-virus
program. E.g; Dr. Solomon, Center point, Microsoft antivirus. E.t.c.
v Keep all program disk/diskette in a
conducive environment.
MOUSE
This is the device that is used to
direct the cursor around the screen, in the computer system for execution of
command. It is use to select command like word, picture or icon on the computer
quickly than the keyboard. It is one of the input devices.
USES OF MOUSE
Ø POINTING:
it means pointing the mouse pointer on a desired item.
Ø CLICKING: it
means pressing and releasing either the left or the right button once, for
execution of a command.
Ø DOUBLE CLICKIHG:
pressing and releasing the left button of the mouse twice simultaneously in
quick succession for execution of command.
Ø DRAGGING: it
means holding down the left button of the mouse and on item and moving it to
desire destination.
KEYBOARD
It is one of the input devices that is used to key in data into
the computer system.
CLASSIFICATION OF KEYBOARD
v ALPABETICAL KEYS:
they are keys ranging form A-Z
v AUMERICAL KEYS: they
are key numbers key starting from 0-9
v EDTING KEYS (DELETE AND BACK SPEACE): they
are the key use to remove operation in computer system. E.g backspace and space
bar.
v FUNCTIONING KEYS: they
are the first set of alphanumerical keys
ranging from F1 – F2
v ENTER KEY:
it is use to execute command, it is also used to start a new line while
typing…..
v SHIFT KEY:
it is use as a second functioning key which help to execute command. E.g; hold
shift and press 2 to get @.
v CURSOR CONTROL KEYS: these
are special keys which include the following %, #, *, +, c,) e.t.c. They require shift key to function.
v ALLERNATE AND CONTROL KEY:
it functions simultaneously with other keys to carry out operation.
v ARROW KEYS: it
is use to direct the cursor around the screen. It is used instead of mouse.
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