INPUT DEVICES OF COMPUTER
Keyboard
The keyboard and mouse are the most widely used input devices at the moment. Keyboard is designed for people with special needs.
Light pen
Another input device is called a light pen which can be used to point at a monitor. It is similar function to a mouse. A touch sensitive screen is a method of input based on touching a specially designed screen in particular places.
Barcode scanners
It is very popular input device in supermarkets and stores. These devices scan barcodes which identify products. This is a form of OCR. The barcode is translated to a number which can be used by the computer to identify the product and look up its price in a database. In addition the software can keep track of stock levels by recording the number of sales of each item.
Optical character recognition(OCR)
An OCR device can scan a document and recognise characters. Text had to be printed in a special OCR font for OCR to operate but nowadays OCR can handle almost any font. The advantage of OCR for companies is that when statements are returned with payments, they can be scanned in and the customer accounts automatically credited.
Mouse
The mouse is used as a pointing device and to select options from menus. A tracker ball is used for the same purpose as a mouse and is popular on laptop computers.
Optical mark render
A less sophisticated but similar device is an optical mark reader which can scan a specially designed from and recognise the presence of marks in particular positions. One use for such a device is in lottery games machines where a user marks numbers on a pre-printed form which is then read by an OCR reader connected to a lottery computer.
Magnetic ink character recognition(MICR)
This is similar to OCR but this time the characters are not scanned optically. Instead they are scanned magnetically as they have printed with magnetised ink, each character having a very distinct shape. This is used on cheques by banks, to encode bank account numbers.
Image scanners
Image scanner is devices which scan an image (document, photograph) and produce a digital version of the image i.e. the image is stored as a sequence of binary numbers. Special software can then display the digital version of the image on a monitor. They effectively photocopy the images into computer. This type of technology is very useful for storing legal documents, application forms and anywhere there is a requirement to access the contents of an original document very quickly.
Cards
Whole range of cards is available such as ATM and credit cards which encode information magnetically. These cards can be read by card readers and allows you carry out various transactions such as paying for goods or obtains cash.
Wednesday, 10 May 2017
Computer Mouse
MOUSE
MOUSE is one of earliest computer peripherals device.mouse is widely used in all over world.
Mouses is designed for pointing and clicking .computer mouse enables its user to move a cursor smoothly.This is a input device for selecting,dragging,hovering and clicking.It allow user to switch between the applications and select options and buttons and move around the screen with great fluidity.
Mouses perform different clicking like Single-click,double-click,triple-click and right click.It is used to move between and select links on a website,buttons on an options screen,entities on a menu and many more… mouse allow user to zoom in and out quickly.
Most mice come with a left button, a right button and a scroll wheel.scroll wheel located between the two buttons.most commonly left button is used.Left button is used generally for selecting purpose.Right button is used mainly for display options like copy, cut ,new etc.scroll wheel is used to scroll the page i.e up or down.
Mouses is generally used when accuracy is important.It is essential for creative application as image,video and music editing.
Most mice connect to a computer via a USB cable or a wireless USB dongle.Many come with additional buttons that are useful for creative professionals and gamers.Mostly model are designed to fit the hand more comfortably.
Wireless mice are becoming extremely popular as they give computer user cordless accessibility to their mice and their computer.wireless mouse usually work via radio frequencies(RF).RF require two components to work i.e. radio transmitter and radio receiver.RF transmitter usually integrated inside the mouse .The mouse records its movements and buttons that are clicked and then sends this information via radio signals to the receiver. RF receiver receive these RF signals then decode them and sends these signals directly to the computer.This mice are so popular as it is inexpensive,reliability and stability.
The mouses fits in the palm of user hand.generally all mice are set up for right hand dominant use but can be adjusted for left hand use too.As practice make man and women perfect like it more you practice with the mouse and more comfortable you will.
Mouses is generally used as it is easy to use and reduces user time.
MOUSE is one of earliest computer peripherals device.mouse is widely used in all over world.
Mouses is designed for pointing and clicking .computer mouse enables its user to move a cursor smoothly.This is a input device for selecting,dragging,hovering and clicking.It allow user to switch between the applications and select options and buttons and move around the screen with great fluidity.
Mouses perform different clicking like Single-click,double-click,triple-click and right click.It is used to move between and select links on a website,buttons on an options screen,entities on a menu and many more… mouse allow user to zoom in and out quickly.
Most mice come with a left button, a right button and a scroll wheel.scroll wheel located between the two buttons.most commonly left button is used.Left button is used generally for selecting purpose.Right button is used mainly for display options like copy, cut ,new etc.scroll wheel is used to scroll the page i.e up or down.
Mouses is generally used when accuracy is important.It is essential for creative application as image,video and music editing.
Most mice connect to a computer via a USB cable or a wireless USB dongle.Many come with additional buttons that are useful for creative professionals and gamers.Mostly model are designed to fit the hand more comfortably.
Wireless mice are becoming extremely popular as they give computer user cordless accessibility to their mice and their computer.wireless mouse usually work via radio frequencies(RF).RF require two components to work i.e. radio transmitter and radio receiver.RF transmitter usually integrated inside the mouse .The mouse records its movements and buttons that are clicked and then sends this information via radio signals to the receiver. RF receiver receive these RF signals then decode them and sends these signals directly to the computer.This mice are so popular as it is inexpensive,reliability and stability.
The mouses fits in the palm of user hand.generally all mice are set up for right hand dominant use but can be adjusted for left hand use too.As practice make man and women perfect like it more you practice with the mouse and more comfortable you will.
Mouses is generally used as it is easy to use and reduces user time.
Computer Keyboard
KEYBOARD
Keyboard is widely use and most common input device.keyboard is like a typewriter. keyboard enables user to enter data into a computer.
keyboard is a input device. Keyboard is made up of button commonly termed as key.Computer keyboards are similar to electric-typewriter keyboards but contain additinal keys.
The keys found on computer keyboards are classified as follows:
Alphanumeric keys: The letters and numbers on the keyboard.
Punctuation keys: The comma, period, semicolon, and similiar keys.
Special keys: This includes the function keys , control keys, arrow keys , caps Lock key , and so on.
Keypads
Keypads are assembled in a matrix form.
In the default state (all switches open) there is no connection between the rows and columns. When a
switch is pressed a connection between the switch’s row and the switch’s column is made.
Types of keyboard
Qwerty: combination of layout of letters, numbers, and punctuation is known as a QWERTY keyboard.It is termed so as six keys on the top row spell QWERTY.It is designed for slow typists.
AZERTY:It is designed to increase the speed of typists.
DVORAK:It is designed in such a way that middle row consist common letters.It is also designed to increase the speed of typists..
Computer Keyboard Standards
XT KEYBOARDS: This key consist of 84 keys
AT KEYBOARDS: This key consist of 84 keys
AT(ENCHANCED) KEYBOARD: This key consist of 101keys
The three differ in the placement of function keys, the Control key, the Return key , and the Shift keys.
In addition to these keys, keyboards usually contain the following keys:
Page Up , Page Down , Home, End, Insert, Pause , Num Lock,
Scroll Lock , Break, Caps Lock, Print Screen.
User choose the keyboard according to their requirement and cost.
WORKFLOW OF COMPUTER KEYBOARD.
ADVANTAGE OF KEYBOARD:
· It provide shortcut keys for opertation
· Direct control without much movement
· Less expensive
Keyboard are generally use when large data is required to type.keyboard is essential part of computer.A good typist can type the data very quickly but it is easy to make mistake while typing.
Most keyboard connect to a computer via a USB cable or a wireless USB dongle. Now-a-days wireless USB dongle is more common.keyboard price are vary according to its standard.
Keyboard is widely use and most common input device.keyboard is like a typewriter. keyboard enables user to enter data into a computer.
keyboard is a input device. Keyboard is made up of button commonly termed as key.Computer keyboards are similar to electric-typewriter keyboards but contain additinal keys.
The keys found on computer keyboards are classified as follows:
Alphanumeric keys: The letters and numbers on the keyboard.
Punctuation keys: The comma, period, semicolon, and similiar keys.
Special keys: This includes the function keys , control keys, arrow keys , caps Lock key , and so on.
Keypads
Keypads are assembled in a matrix form.
In the default state (all switches open) there is no connection between the rows and columns. When a
switch is pressed a connection between the switch’s row and the switch’s column is made.
Types of keyboard
Qwerty: combination of layout of letters, numbers, and punctuation is known as a QWERTY keyboard.It is termed so as six keys on the top row spell QWERTY.It is designed for slow typists.
AZERTY:It is designed to increase the speed of typists.
DVORAK:It is designed in such a way that middle row consist common letters.It is also designed to increase the speed of typists..
Computer Keyboard Standards
XT KEYBOARDS: This key consist of 84 keys
AT KEYBOARDS: This key consist of 84 keys
AT(ENCHANCED) KEYBOARD: This key consist of 101keys
The three differ in the placement of function keys, the Control key, the Return key , and the Shift keys.
In addition to these keys, keyboards usually contain the following keys:
Page Up , Page Down , Home, End, Insert, Pause , Num Lock,
Scroll Lock , Break, Caps Lock, Print Screen.
User choose the keyboard according to their requirement and cost.
WORKFLOW OF COMPUTER KEYBOARD.
ADVANTAGE OF KEYBOARD:
· It provide shortcut keys for opertation
· Direct control without much movement
· Less expensive
Keyboard are generally use when large data is required to type.keyboard is essential part of computer.A good typist can type the data very quickly but it is easy to make mistake while typing.
Most keyboard connect to a computer via a USB cable or a wireless USB dongle. Now-a-days wireless USB dongle is more common.keyboard price are vary according to its standard.
Peripheral Devices in Computer
Peripheral Devices
Computer peripheral is kind of device which connect to computer. It refer to a device which is responsible for input as well as output of computer. Peripheral devices can connect to computer through wire or wireless like I/O interface, universal serial bus(USB),serial port ,Bluetooth etc.Devices will perform it function after connect to the computer system.
A Peripheral device may be classified as: ·
Internal device ·
Internal device It is IN-built device.user can use through external device. CD-ROM drive,CD-R drive, Internal modem etc.
External device
External device It must be connected by user. Mouse,keyboard,printer, Monitor etc. Mostly when we refer to peripherals device we mean external ones but both have equal importance.
Type of Peripheral Device:
Input devices It is used to send data to a computer.it allow users to communicate and feed instructions and data to computer for processing,display or transmission. Ex: Mouse, keyboard etc Output device It is used to send data from computer to another device or user. Ex:Monitor , printer ,projectors,headphones etc Storage device
It is used for storing,porting and extracting data files.It can store data temporarily and permanently both. Ex:Hard drive, flash drive etc
Some most common Peripheral devices are: ·
Mouse
A mouse is a small handheld input device that controls a computer screen ü It reduces the use of keyboard. Mouse connect to the computer through cable or cord or Bluetooth or radio frequency.
Keyboard
Allow user to input data or to communicate with a computer. ü Keys and letters are arranged to function as electronic switches. Key include punctuaton,alphanumeric and special keys like windows key and multimedia key.
Printer
It accepts text and graphic output from a computer and transfers the information to paper. ü It vary in size,speed,sophistication and cost.
Internal modem
It is a device installed inside a computer allowing the computer to communicate over a network with other connected computers. Two types of internal modems: dial-up and Wifi. ·
Scanner
It is a device that scans documents such as photographs and pages of text. ü It is handheld,feed-in and flattered types.
Is it Essential device of computer?
It is not the essential part but important part of computer.without this device it quite complex to interact with computer.This is the most common way to interact with computer and widely acceptable.
Computer peripheral is kind of device which connect to computer. It refer to a device which is responsible for input as well as output of computer. Peripheral devices can connect to computer through wire or wireless like I/O interface, universal serial bus(USB),serial port ,Bluetooth etc.Devices will perform it function after connect to the computer system.
A Peripheral device may be classified as: ·
Internal device ·
Internal device It is IN-built device.user can use through external device. CD-ROM drive,CD-R drive, Internal modem etc.
External device
External device It must be connected by user. Mouse,keyboard,printer, Monitor etc. Mostly when we refer to peripherals device we mean external ones but both have equal importance.
Type of Peripheral Device:
Input devices It is used to send data to a computer.it allow users to communicate and feed instructions and data to computer for processing,display or transmission. Ex: Mouse, keyboard etc Output device It is used to send data from computer to another device or user. Ex:Monitor , printer ,projectors,headphones etc Storage device
It is used for storing,porting and extracting data files.It can store data temporarily and permanently both. Ex:Hard drive, flash drive etc
Some most common Peripheral devices are: ·
Mouse
A mouse is a small handheld input device that controls a computer screen ü It reduces the use of keyboard. Mouse connect to the computer through cable or cord or Bluetooth or radio frequency.
Keyboard
Allow user to input data or to communicate with a computer. ü Keys and letters are arranged to function as electronic switches. Key include punctuaton,alphanumeric and special keys like windows key and multimedia key.
Printer
It accepts text and graphic output from a computer and transfers the information to paper. ü It vary in size,speed,sophistication and cost.
Internal modem
It is a device installed inside a computer allowing the computer to communicate over a network with other connected computers. Two types of internal modems: dial-up and Wifi. ·
Scanner
It is a device that scans documents such as photographs and pages of text. ü It is handheld,feed-in and flattered types.
Is it Essential device of computer?
It is not the essential part but important part of computer.without this device it quite complex to interact with computer.This is the most common way to interact with computer and widely acceptable.
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