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Computer Hardware (Input and Output)

Keyboard

Primary input device for entering text and numbers

QWERTY

Most common keyboard layout

Modifier keys

Shift, Control, Alt

Mouse

Pointing device for selecting text, accessing menus, interacting with programs

Trackball

Pointing device that works like an upside down mouse

Touch pad

Stationary pointing device used by moving your finger across a small surface

Light pen

Used for PDAs

Monitor

Most commonly used output device

Printer

Often characterized by image quality, speed, initial cost, and cost of operation

Barcode reader

Uses a light source to read patterns of printed lines

Scanner

Input device that analyzes an image, text, or object and converts it into a digital image

Pixel

Picture element

Microphone

Input device that allows you to use your voice as input

Sound system

Speakers plus sound card

Sound card

Translates digital sounds into the electric current that is sent to the speakers

Function keys

Keys that alone or in combination with shift/alt/control that allow the users to input commands quickly

Dot-matrix printer

Uses a print head which contains a cluster of pins which press an inked ribbon against the paper

Inkjet printer

Creates an image by spraying tiny droplets of ink onto the paper

Laser printer

Uses head and pressure to bond tiny particles of toner to paper

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