Saturday 3 September 2011

Input Devices

Mouse
A mouse is a small device that a computer user pushes across a desk surface in order to
point to a place on a display screen and to select one or more actions to take from that
position. The mouse first became a widely-used computer tool when Apple Computer
made it a standard part of the Apple Macintosh. Today, the mouse is an integral part of
the graphical user interface (GUI) of any personal computer. The mouse apparently got
its name by being about the same size and color as a toy mouse.
Keyboard
On most computers, a keyboard is the primary text input device. A keyboard on a
computer is almost identical to a keyboard  on a typewriter. Computer keyboards will
typically have extra keys, however. Some of these keys (common examples include
Control, Alt, and Meta) are meant to be used in conjunction with other keys just like
shift on a regular typewriter. Other keys (common examples include Insert, Delete,
Home, End, Help, function keys, etc.) are meant to be used independently and often
perform editing tasks.
Joystick
In computers, a joystick is a cursor control device used in computer games. The joystick,
which got its name from the control stick used by a pilot to control the ailerons and
elevators of an airplane, is a hand-held lever that pivots on one end and transmits its
coordinates to a computer. It often has one or more push-buttons, called switches,
whose position can also be read by the computer.
Digital Camera
A digital camera records and stores photographic images in digital form that can be fed
to a computer as the impressions are recorded or stored in the camera for later loading
into a computer or printer. Currently, Kodak, Canon, and several other companies make
digital cameras.
Microphone
A device that converts sound waves into audio signals. These could be used for sound
recording as well as voice chatting through internet.
Scanner
A scanner is a device that captures images from photographic prints, posters, magazine
pages, and similar sources for computer editing and display. Scanners come in hand-held,
feed-in, and flatbed types and for scanning black-and-white only, or color. Very high
resolution scanners are used for scanning for high-resolution printing, but lower
resolution scanners are adequate for capturing images for computer display. Scanners
usually come with software, such as Adobe's Photoshop product, that lets you resize and
otherwise modify a captured image 

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