Download - Input output devices (saniya shaikh)
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INPUT AND OUTPUT DEVICES
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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.
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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)
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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.
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POINTING DEVICES
MOUSE TOUCHPAD TRACKPOINT TRACKBALL JOYSTICS TOUCHSCREEN GRAPHICS TABLETS SCANNER MICOPHONE MIDI DEVICES
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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
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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.
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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.
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OUTPUT DEVICES
Output devices displays the processed form of data to the end user.
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COMMON OUTPUT DEVICES INCLUDE;Common Output devices include; Monitor Printer Speaker(SOUND OUTPUT)
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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.
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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
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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.
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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
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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.
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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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