input output devices (saniya shaikh)

INPUT AND OUTPUT DEVICES

INPUT DEVICES An input device feeds data to the

computer system for processing. Here is a list of input devices of a

Computer System. We are going to discuss the most commonly used input devices in this article.

COMPLETE LIST OF INPUT DEVICES

Keyboard Mouse/POINTING DEVICES Scanner Digital Camera , Camcorder Gamepad, Joystick, Steering wheel. Mic Barcode Reader Pen / Stylus Touch Screen Webcam Biometrics (Thumb impression / Face

detection)

KEYBOARD Keyboard is the most common input

device of a Computer System. The keyboard resembles a typewriter. Modern Keyboards have more than just the letter and numeric keys. They have multimedia keys for volume control, Play / Pause videos etc. Every single key on a keyboard is assigned a binary numbers to it which transmits that binary pattern to the computer.

POINTING DEVICES

MOUSE TOUCHPAD TRACKPOINT TRACKBALL JOYSTICS TOUCHSCREEN GRAPHICS TABLETS SCANNER MICOPHONE MIDI DEVICES

MOUSE Mouse is another commonly used input

device of a computer system. The mouse is a pointing device that moves the cursor on the screen. You can place the cursor on icons and by clicking you can launch a program. A typical Mouse has two buttons, the left and right clicking buttons and a wheel in the center for scrollingA user can perform many operations through a Mouse, like selecting or arranging different program icons on the desktop

SCANNER Scanner is the third important input device of a computer system. A scanner converts

printed documents in to images. Some types of scanners scan documents and produce the results in black & white images. The scanner operates in the same manner as a Photocopier. A colored scanner works somewhat in a complicated manner as compared to a simple scanner.

DIGITAL CAMERA Digital Cameras are used to capture

images. Those images are then transferred to a computer when the Camera is connected to the computer. Mostly the Digital Camera images are in JPEG format.

OUTPUT DEVICES

Output devices displays the processed form of data to the end user.

COMMON OUTPUT DEVICES INCLUDE;Common Output devices include; Monitor Printer Speaker(SOUND OUTPUT)

MONITOR Monitor is the most important output

device of a computer system. The monitor is the display screen of a computer. Cathode Rays Tube (CRT) and Liquid Crystal Display (LCD) are the two types of Monitors.

TYPES OF MONITOR: CRT MONITORS (CATHODE RAY TUBE) FLATPANNEL MONITORS

1) LIQUID CRYSTAL DISPLAY2) GAS PALSMA DISPLAY

TOCH SCREEN MONITORS1) Resistive Touch Screen2) Surface Wave Touch Screens3) Capacitive Touch Screen

PRINTERS A Printer takes print commands from a computer

and print out text / images on a paper. Different types of printers are available for various purposes. A printer for office use must be heavy duty and fast while for photographs it must produce high quality prints. Dot-Matrix, Ink-Jet, Laser-Jet are the different types of printers. Print quality of Laser-Jet printer is excellent as compared to Ink-Jet or other types of printers, but they are relatively more expensive than the others. Most laser printers produce black & whiter prints while some can produce color prints as well. The color laser printers are way too expensive then black & white laser printers.

TYPES OF PRINTERS 1.Impact printers

1.1. Dot-Matrix Printers 1.2.Daisy-wheel printers 1.3.Line printers 1.4.Drum printer 1.5.Chain printers 1.6.Band printers

2.Non-impact printers 2.1.Ink-jet printers 2.2.Laser printers

2.2.1.Advantages of Laser Printer 2.2.2. Disadvantages of Laser Printer

SPEAKERS Speaker is an important part of a

computer system. Some systems have a built-in speaker, though they are small in size. Speaker is an essential part of a computer because they can notify about various system notifications through various sounds. Big speakers, woofers & sub-woofers are used for enhance sound quality or creating a mini home theater.

DIFFERENCE BETWEEN AN INPUT AND OUTPUT DEVICE An input device sends information to a

computer system for processing, and an output device reproduces or displays the results of that processing. Depending on the interaction, a device can be both, referred to as an input/output or I/O device.

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