5. Computer
• A Computer is a system of information
processing components that perform input,
processing, output, storage, and control
functions . Thus, a computer system consists
of input and output devices, a central
processing unit (CPU), primary and secondary
storage devices, and other peripheral devices.
6. A computer is a system of hardware devices organized
according to the following System Functions:
Input. The input devices of a computer system include:
1. Keyboards
2. Mouse
2. Touch Screens
3. Light Pens
4. Scanners
5. Computer Microphone
9. is any peripheral (piece of computer hardware
equipment) used to provide data and control
signals to an information processing system such
as computer or other information appliance.
10. They convert data into electronic machine-
readable form for direct entry or though
telecommunications links into computer system.
14. Keyboard
- is a typewriter-style device, which uses an
arrangement of buttons or keys, to act as
mechanical levers or electronic switches.
Following the decline of punch cards and paper
tape, interaction via teleprinter -style keyboards
became the main input device for computers.
15. Keyboard
- is a typewriter-style device, which uses an
arrangement of buttons or keys, to act as
mechanical levers or electronic switches.
Following the decline of punch cards and paper
tape, interaction via teleprinter -style keyboards
became the main input device for computers.
16. Keyboard
- is a typewriter-style device, which uses an
arrangement of buttons or keys, to act as
mechanical levers or electronic switches.
Following the decline of punch cards and paper
tape, interaction via teleprinter -style keyboards
became the main input device for computers.
18. Mouse
- is a pointing device that detects two-
dimensional motion relative to a surface. This
motion is typically translated into the motion of
a pointer on a display, which allows for fine
control of a graphical user interface.
19. Mouse
- is a pointing device that detects two-
dimensional motion relative to a surface. This
motion is typically translated into the motion of
a pointer on a display, which allows for fine
control of a graphical user interface.
21. Touch Screen
-is an electronic visual display that the user can
control through simple or multi-touch gestures by
touching the screen with a special stylus/pen and-
or one or more fingers. Some touchscreens use an
ordinary or specially coated gloves to work while
others use a special stylus/pen only. The user can
use the touchscreen to react to what is displayed
and to control how it is displayed (for example
by zooming the text size).
22. Touch Screen
-is an electronic visual display that the user can
control through simple or multi-touch gestures by
touching the screen with a special stylus/pen and-
or one or more fingers. Some touchscreens use an
ordinary or specially coated gloves to work while
others use a special stylus/pen only. The user can
use the touchscreen to react to what is displayed
and to control how it is displayed (for example
by zooming the text size).
23. Touch Screen
-is an electronic visual display that the user can
control through simple or multi-touch gestures by
touching the screen with a special stylus/pen and-
or one or more fingers. Some touchscreens use an
ordinary or specially coated gloves to work while
others use a special stylus/pen only. The user can
use the touchscreen to react to what is displayed
and to control how it is displayed (for example
by zooming the text size).
24. Touch Screen
-is an electronic visual display that the user can
control through simple or multi-touch gestures by
touching the screen with a special stylus/pen and-
or one or more fingers. Some touchscreens use an
ordinary or specially coated gloves to work while
others use a special stylus/pen only. The user can
use the touchscreen to react to what is displayed
and to control how it is displayed (for example
by zooming the text size).
25. Touch Screen
-is an electronic visual display that the user can
control through simple or multi-touch gestures by
touching the screen with a special stylus/pen and-
or one or more fingers. Some touchscreens use an
ordinary or specially coated gloves to work while
others use a special stylus/pen only. The user can
use the touchscreen to react to what is displayed
and to control how it is displayed (for example
by zooming the text size).
27. Light Pens
-is a computer input device in the form of a
light-sensitive wand used in conjunction with a
computer's CRT display. It allows the user to
point to displayed objects or draw on the screen
in a similar way to a touchscreen but with
greater positional accuracy.
28. Light Pens
-is a computer input device in the form of a
light-sensitive wand used in conjunction with a
computer's CRT display.It allows the user to
point to displayed objects or draw on the screen
in a similar way to a touchscreen but with
greater positional accuracy.
30. Scanners
-A scanner is an input device that scans documents
such as photographs and pages of text. When a
document is scanned, it is converted into a digital
format. This creates an electronic version of the
document that can be viewed and edited on a
computer. Most scanners are flatbed devices, which
means they have a flat scanning surface. This is
ideal for photographs, magazines, and various
documents.
31. Scanners
-A scanner is an input device that scans documents
such as photographs and pages of text. When a
document is scanned, it is converted into a digital
format. This creates an electronic version of the
document that can be viewed and edited on a
computer. Most scanners are flatbed devices, which
means they have a flat scanning surface. This is
ideal for photographs, magazines, and various
documents.
33. Computer Microphone
-A device that converts sound waves into
analogous electrical waves. Usually called a
"mike," it contains a flexible diaphragm
composed of film or foil that vibrates as it makes
contact with the sound.
34. Computer Microphone
-A device that converts sound waves into
analogous electrical waves. Usually called a
"mike," it contains a flexible diaphragm
composed of film or foil that vibrates as it makes
contact with the sound.
53. -(CPU)or central processing unit is the main
processing component of a computer
system in (Microcomputers, the CPU is the
main microprocessor).
-CPU’s major arithmetic-logic unit is (ALU)
that performs the arithmetic and logic
functions required in computer processing.
59. Control Unit
is a component of a computer's central
processing unit (CPU) which directs
operation of the processor. It controls
communication and co-ordination between
input/output devices. It reads and
interprets instructions and determines the
sequence for processing the data.
61. Arithmetic logic unit (ALU)
is a digital circuit that
performs integer arithmetic and logical
operations. The ALU is a fundamental
building block of the central processing
unit of a computer, and even the simplest
microprocessors contain one for purposes
such as maintaining timers. The processors
found inside modern CPUs and graphics
processing units (GPUs) accommodate very
powerful and very complex ALUs; a single
component may contain a number of ALUs.
63. Computer data storage,
often called storage or memory, is a
technology consisting
of computer components and recording
media used to retain digital data. It is a core
function and fundamental component of
computers. The central processing unit (CPU)
of a computer is what manipulates data by
performing computations. In practice, almost
all computers use a storage hierarchy, which
puts fast but expensive and small storage
options close to the CPU and slower but larger
and cheaper options farther away.
76. Video Display Units
VDU displays images generated by a computer
or other electronic device. The term VDU is
often used synonymously with “monitor," but
it can also refer to another type of display,
such as a digital projector. Visual display units
may be peripheral devices or may be
integrated with the other components. For
example, the Apple iMac uses an all-in-one
design, in which the screen and
computer are built into a
single unit.
77. Video Display Units
VDU displays images generated by a computer
or other electronic device. The term VDU is
often used synonymously with “monitor," but
it can also refer to another type of display,
such as a digital projector. Visual display units
may be peripheral devices or may be
integrated with the other components. For
example, the Apple iMac uses an all-in-one
design, in which the screen and
computer are built into a
single unit.
79. Audio Response Unit
A device that provides synthesized voice
responses to dual-tone multifrequency
signaling input by processing calls based on
(a) the call-originator input, (b) information
received from a host data base, and (c)
information in the incoming call, such as
the time of day.
80. Audio Response Unit
A device that provides synthesized voice
responses to dual-tone multifrequency
signaling input by processing calls based on
(a) the call-originator input, (b) information
received from a host data base, and (c)
information in the incoming call, such as
the time of day.
97. Primary Storage Function Unit
(main memory/hard disks)
Primary storage, also known as main storage
or memory is the main area in a computer in
which data is stored for quick access by the
computer's processor. On today's smaller
computers, especially personal computers and
workstations, the term random access memory
(RAM) - or just memory - is used instead of
primary or main storage, and the hard disk,
diskette, CD, and DVD collectively
describe secondary storage or auxiliary storage.
99. Secondary Storage Devices
(Magnetic disk tape units optical disks)
Secondary storage technology refers
to storage devices and storage media that
are not always directly accessible by a
computer. This differs from primary storage
technology, such as an internal hard drive,
which is constantly available.
