what is monitor?Also describe the characteristics of monitor.

what is monitor?Also describe the characteristics of monitor.

MONITOR Monitor is also called display screen. it is a commonly used output device. it is used as soft-copy output device. the output may be... 03:52

MONITOR
Monitor is also called display screen. it is a commonly used output device. it is used as soft-copy output device. the output may be in the form of text, graphics and video.
Type of Monitors
Monitors are divided into two types:CRT Monitor and flat-panel Monitor.
Characteristic of Display Screen
Monitors are catheterized according to the following parameters:
1.   Size
2.   Color
3.   Resolution
Size
Monitors are available in various sizes. The common sizes are 15,17,19,21, and 22 inches. The large size monitors are more expensive. The size  of monitor is measured diagonally from one corner to other of the screen.
Color


Today,most of the monitors show output in multiple colors. The commonly used monitor is the RGB screen. RGB stands for Red, green and Blue. RGB monitor can create 256 different colors and thousands of variations of these colors.
Some monitors show output is single color. These monitors are known as monochrome monitors.Today,these monitors are rarely used.
Resolution
The monitor's screen is divided into small dost. These dots are called pixels for picture elements. the pixels are arranged horizontally and vertically. the number of pixels on a screen is called its resolution. the monitor's screen that has large number of pixels has high resolution. High resolution monitors have (2000)(200) pixels. the resolution refers to the sharpness and clearness of an image or picture.

write short notes on "digital camera and video camera".what is audio input and audio input device?write short notes in microphone and speech recognition system.

write short notes on "digital camera and video camera".what is audio input and audio input device?write short notes in microphone and speech recognition system.

Digital camera A digital camera is an input device. it is used to capture(or take) pictures and stores them in digital form. it does not use... 10:44

Digital camera
A digital camera is an input device. it is used to capture(or take) pictures and stores them in digital form. it does not use traditional camera film. it uses a light-sensitive processor chip to capture photographic images in digital form. these images are stored on a small diskette inserted in  the camera or on flash memory chip. the stored pictures or photographic images can then be loaded in the computer from the disk (or flash memory chip) for further processing.
Video Camera
The process of entering video data into a computer is called video input. Video input consists of motion pictures or movie films. the devices that are used to enter video input into computer are called video input devices.

Video camera is a video input device. it is used for recording video (i.e. movie films)and images of any type. the video and images are recorded in digital form. the recorded videos or images can be transferred into the computer by directly connecting the video camera to a USB port on the system unit.
Audio and Audio input device
Audio input is the process of entering any sounds into the computer. it may include speech, music etc. the device that is used to enter/record sound(audio input ) into computer is called audio input device.
Microphone


Microphone is most commonly used an as audio input devices. it is used to enter sound (or voice) into the computer. it is connected with computer through sound card. A sound card receives sound from microphone in analog form and converts it into digital form. So the sound is stored inside the computer in digital form.
Speech-Recognition system
A system that coverts the voice in to text of commands is known as speech recognition system or voice recognition system. in this system , a microphone is used as an input device.

Speech recognition system allows as user to use voice as input. the user speaks through microphone to give commands to computer such as opening programs, printing, document, shutting down the computer, saving the document etc.

Speech recognition system are not commonly used due to English language pronunciation and limited vocabulary.

what is mouse?describe its functions.

what is mouse?describe its functions.

MOUSE Mouse is the most commonly used pointing input device. it is used to control the cursor or pointer on the screen and give commands to ... 04:28

MOUSE
Mouse is the most commonly used pointing input device. it is used to control the cursor or pointer on the screen and give commands to the computer. it is very easy to use the mouse is attached with the computer by a cable or wireless connection.

the top of mouse contains one wheel and 2 or 3 buttons. these buttons can be clicked or double clicked to perform different task. For example, an object (icon) on the screen is elected by clicking the left button of mouse. similarly, a program or folder is opened by double clicking the left button of mouse.

Types of Mouse
the most popular types of mouse are as follows:
1)  Mechanical Mouse:   it has a small ball at the bottom the ball rotates as the mouse is rolled aver a flat surface. Usually, a rectangular rubber pad ( known as mouse pad) is used as flat surface. As the mouse is rolled over the flat surface, the pointer moves in the same direction on the screen.
2)  Optical Mouse:  it has no ball at the bottom.it uses the laser technology to detect the mouse movement. Nowadays, it is commonly used in personal computers(PCs).


Trackball
A trackball is a pointing input device. it performs functions like a mouse but it is a stationary device. it has a movable ball on its top. the ball is rotated or rolled with fingers( or palm of the hand) to move the pointer on the screen.Like mouse, a trackball also has button used to send the commands to computer.
Touch Pad
Touch Pad is a pressure-sensitive pointing input device. Touch pad is also known as touch pad. it is also stationary device like trackball but it has no moving parts. it is a small, flat surface (or sensitive pad) over which a user slides fingertip to move the pointer on screen. touch pad also has one or more buttons. these buttons are located near the pad. these button work like mouse buttons. touch pad is normally used with laptops.

what is keyboard?describe the enhanced keyboard and its segments.

what is keyboard?describe the enhanced keyboard and its segments.

Keyboard Keyboard is the most commonly used input device. it is mostly used to enter text and numeric type data into the computer. the butto... 07:21

Keyboard
Keyboard is the most commonly used input device. it is mostly used to enter text and numeric type data into the computer. the buttons on the keyboard are called keys.the keyboard contain keys for all alphabetic characters. numeric s digits, and special characters. it also contains some special keys known as function keys. a standard keyboard contains more then 100-keys. the standard keyboard is also QWERTY keyboard. this is because the first six leftmost keys on the top row of alphabets are Q,W,E,R,T and Y. the standard keyboard is shown in figure below.

Parts of keyboard
the keys of a standard keyboard can be divided into following four parts:
1)   Function Keys
2)   Main Keyboard
3)  Numeric Keys
(1)Function keys
there are 12 function keys on the top of keyboard that are labeled  as F2,........,F12. these keys are used to perform special functions. the function of each function key depends upon the software being used on the computer. when a function keys is pressed, a command is sent to the computer. for example, in many software's, the function keys F1 is used to get help about the software currently running on the computer.
(2) Main Keyboard
the main keyboard area is like a typewriter keypad. it includes alphabetic character keys, numeric  keys and some special command keys. the function of command keys depend upon the software being used on the computer. some of the most commonly used command keys are:
Esc:   Usually, this key is used to cancel the current action or  task that is being performed on the                                                                                                                                        computer.
Tab:   it is used to insert a tab(space of 6 or 8 characters) into a document from the current position of cursor.
CAPS LOCK:   it is used to change lowercase letters mode to uppercase and vice versa. the number and symbols are not effected.
SHIFT:    it is used to type some uppercase letters if you are typing in lowercase mode and vice versa. similarly some keys have two symbols printed on them. by default, lower printed symbol or letter is type. To type, the upper symbol, the Shift key is pressed in conjunction with that key.
Ctrl:     Ctrl stand for control. it is used in combination with other keys to apply commands to the computer. for Example, in many applications Ctrl + S shortcut is used to save the current document.
Alt:     Alt stand for Alternate. it is also used in combination with other keys to apply commands to the computer.
Backspace:   Backspace is used to delete  a character to the left of the cursor. the cursor is moved one position backward after deleting the character.
Enter:         Enter key is used to insert new line or paragraph into a word document (or any text editor). it is also used to perform a selected command or action.
(3) Numeric Keys
this part of keyboard consists of numeric keys and arithmetic operator keys. these keys are usually located on the right of the keyboard. these keys are similar to calculator keys. this part of keyboard also has an extra Enter key and Num Lock key. the Num Lock key is used to activate or de-activate the numeric keyboard.
when the computer is in Num Lock mode, these keys are used to enter numeric data and mathematical operators (such as /, *, _ , + ,).

what is I/O processor?

what is I/O processor?

I / O PROCESSOR I/O processor is separated from the  main processor or CPU. it handles the input/output devices. ti also controls the transf... 09:03

I / O PROCESSOR
I/O processor is separated from the  main processor or CPU. it handles the input/output devices. ti also controls the transfer of information between the computer is main memory  and input/output devices.

there are many input/output devices like keyboard, mouse, scanner, monitor, printer,plotter, microphone, video camera, disk drivers etc. the functions of these devices are different from each other. the I/O devices are also slower as compared to the speed CPU  and primary storage. it is because the speed of I/O devices depends upon the mechanical movement of the components of the devices. it is difficult for CPU to control these devices directly.

the I/O processor handles all I/O operations without the involvement of CPU. CPU perform other different operations, instead of I/O operation. it means that CPU and I/O processors run parallel. Most of the computers have one or more I/O processors.
INPUT
anything given to the computer is called input. the data and instructions are given to the computer as input.
Input Devices
the devices that are used to enter data and instructions into the computer are called input devices. the input devices is a hardware component. it takes input from user and converts it into a form that a computer can use.

A list of most popular and commonly used input devices is as follows:
Keyboard
Mouse
Trackball and Touch pad
Scanners
Video camera
Microphone
Character-recognition devices.

what is software? describe the main categories / types of software.

what is software? describe the main categories / types of software.

SOFTWARE a set of instruction given to the computer to solve a particular problem ( or to perform a specific task), is called software. Soft... 20:34

SOFTWARE
a set of instruction given to the computer to solve a particular problem ( or to perform a specific task), is called software. Software is also called computer program.  

Software tells to the computer what to do and how to do. therefore, a computer preform different operation according to the given instruction. Software is developed in computer programming language.
note:best example of software in real life is human soul whereas body is example of hardware.
Types of software
1-   System software 
A program or set of programs that is especially designed to control different operations of computer system is called system software. it control the working of different components of the computer. the system software also enables the other application programs to execute properly.
the examples of system software are:
operating systems.
Utility programs.
Device Drivers.
Language Processors.
Application software
A program or set of programs that are especially designed to solve the specific problems of user, are called application software.it is also known as software package for application package.
Application software is normally available as a package. it consists of the following:
the software supplied on CD-ROM or Floppy disk.
A manual that explains how to use the software.
Training material supplied on CD-ROM or in a booklet.
Categories of Application software
the application software is divided into two main categories:
1-   Custom-built software
2-    Packaged software
1-     Custom-built software
the software that is developed for a particular customer or organization is called custom-built software.it is also known as customized software. for example, software developed to maintain the the records of students of a particular college is an example of custom-built software.
2-    Packaged software
the software that is developed for sale to the general public is called packaged software. packaged software is used to solve some common problem of many people or users.

best example of packaged software is MS-Office that consists of following software's/applications:
word processing software such as MS-Word
Spreadsheet software such as MS-Excel
Outlook for sending and receiving emails
PowerPoint for making presentations.

what is computer hardware? briefly describe the basic hardware devices or components of a computer system?

what is computer hardware? briefly describe the basic hardware devices or components of a computer system?

Hardware The physical components of a computer are called Hardware. You can touch, see and feel hardware. the input/Output devices (such as ... 21:51

Hardware
The physical components of a computer are called Hardware. You can touch, see and feel hardware. the input/Output devices (such as keyboard, Mouse, Printer, Monitor), CPU, Memory unit etc. are example of hardware.

the basic hardware components of computer system are shown in the following figure.
A brief description about basic components of a computer system is as follows:
1-   Input device
         the data and instructions are given to the computer as input. the input device is used to give input to the computer. It accepts input (data & program instruction) in a from that a computer can use. the most commonly used input devices are keyboard, mouse, scanner, microphone etc.
2-   Processor
         Processor is the most important component of the computer. it is also known as central processing Unit(CPU). it is considered as the brain of the computer. it processes (or manipulates) input data according to the given instruction, and converts it into useful information. it is further divided into two main components: these are Control Unit(CU) and Arithmetic Logic Unit (ALU).
3-   Memory Unit
       the memory unit is another important part of computer. it is used to store data and instruction that are currently in use. the main memory or REM is an example of memory unit.
4-    Output Device
        the processed data is also known as output. the output device is used to get output from the computer. it gives processed data or results in  form that a user can understand.the commonly used output devices are monitors, printers and speakers.              
 5-     Secondary storage device
 it is used to store data and programs permanently for later use.the commonly used secondary devices are hard disk,USB drivers,floppy disk,CD-ROM etc.
6-      Bus interconnection
           a bus is electrical path on motherboard.it consists of 8,16,32,or 64 parallel wires.it links different components or devises on motherboard.the data,instructions or control signals flow from one component of computer to  another through bus.