Input output
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Transcript of Input output
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Input DevicesInput Devices
• Parts of Computer, which are used to
feed data and commands are called Input Devices .
Some Input Devices are:
Keyboard Mouse Joy Stick Scanner Touch Screen
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KeyboardKeyboard
Keyboards are input devices. It is used to type words, numbers, and symbols in the computer.
The keys on the keyboard can be classified as follows:
Alphabetic keys Numeric keys Function keys Symbols keys
Special keys
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MouseMouse
• Mouse is a pointing device which is used to draw, move and resize the picture and words.
• It has a small ball inside ,which when rolls ,moves the rollers ,which move the pointer on the screen of monitor.
• It has two buttons on the top .
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JoystickJoystick
• A joystick consists of vertical bar.
• It can be rotated in various directions.
• This rotation moves the cursor to the desired position.
• It contains various buttons for various functions.
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ScannerScanner
• A Scanner is an input device. It is used to make an exact copy of text or a picture and send them to the computer .
• Computer scanners are used to scan images, including documents and photos.
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Touch ScreenTouch Screen
• Touch screens only needs a finger touch to supply input to the system, rather than typing on keyboard or pointing with a mouse.
• It is a selection of processing options that are represented with graphical icons.
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Output DevicesOutput Devices
• An output device is any piece of computer hardware equipment used to communicate the results of data processing carried out by an information processing system (such as a computer) to the outside world.
The output devices are:
• Monitor • Speaker• Headphone• Printer • Plotter • Projector
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MonitorMonitor
• The monitor displays the video and graphics information generated by the computer through the video card.
• Monitors are very similar to televisions but usually display information at a much higher resolution.
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SpeakerSpeaker
• Speakers enable the computer to output sound through speakers.
• Speakers are required to listen to music and video CD/DVD sound.
• This also allow us to listen to the computer generated sound. Some monitors have built in speakers.
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HeadphoneHeadphone
• Headphones give sound output from the computer.
• They are similar to speakers, except they are worn on the ears so only one person can hear the output at a time.
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PrinterPrinter
• A printer is a device that prints text or illustrations on paper.
• There are many types of printers an they are:
Daisy-wheel Dot-Matrix Ink-Jet printer Laser LED Thermal
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PlotterPlotter
• Plotters are similar to the
computer printers. It is used to draw pictures on paper based on commands from a computer.
• Plotters differ from printers in that they draw lines using a pen.
• They can produce continuous lines. Plotters are used in engineering applications. They are more expensive than printers.
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ProjectorProjector
• A projector is a device that enables an image, such as a computer screen, to be projected onto a flat surface.
• These devices are commonly used in meetings and presentations as they allow for a large image to be shown so everyone in a room can see.