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Input and Output Devices
What are Input Devices ?
Input devices are those machines
that feed data into the computer .
Some Input devices are :
Camera Joystick Mouse Microphone Scanner Keyboard
What are output devices ?
Output devices are those machines
capable of representing
information from a computer.
Some Output Devices are :
• Monitor • Printer • Speakers •Headphones
INPUT DEVICES1 .keyboard
2. mouse3. track ball
4. track point5. track pad
Keyboard• One of the common and widely used input device. • The keyboard is divided into different areas.• The most common names for keyboards is QWERTY.
Advantages of a keyboard
Advantages : • A keyboard is usually
supplied with computers • People are used to using
keyboards to enter data.
Disadvantages of a keyboard Disadvantages:• Mistakes are easily made • Excessive use can lead to
R.S.I• Keyboards are not suitable
for creating diagrams
Mouse• The mouse is also one of the
most common input devices used.• Also known as the pointing
device.• Enables you to control what
happens on the screen and what to point at.
Advantages of a mouse.
• Ideal for use with desktop computers •Users are familiar with the mouse • It is faster than using a keyboard
Disadvantages of the mouse.
•Overuse can lead to R.S.I.• Is not accurate in drawings.• Is not easy and convenient to insert text.
TrackballIs like a mouse and is used
to control a pointer on screen
Track point It is found in the middle of
the keyboard and is used to move the pointer on the screen.
Touch padA small area which has to
be touched in order to move the pointer on screen.
Output devices1.printer
2. monitor3. speaker
4. headphones
Printer
• Printers produce hard copy of the information.• There are quite a good number of
printers of different types some are : laser printer, inkjet printer etc..
Advantages
Inkjet Laser
Quiet Speed ( moves more quickly)
Fast Precision Cheap Economy
Good quality Excellent quality
Inkjet Laser
Ink may be smudged Expensive
Good quality paper needed Cartridges are quite expensive
Disadvantages
MONITOR• It is a screen which display output from a computer.• A monitor is usually used to see programs on a
computer• There are two main types of monitors:The CRT monitor, which is big and heavy. It is the oldest
technology used by monitors. It looks like a television, but has a bigger display resolution and often a higher frequency. CRT stands for cathode-ray tube.
The LCD monitor, which is thin, flat, and lightweight. It is a newer technology than CRTs. The quality can be the same or even better than a CRT, but this type of monitor usually costs more than a CRT.
Advantages and disadvantages
Advantages Disadvantages
Cheap CRT is abit more dull than LCD
Displays everything you are doing
Consumes a lot of power
communication
Headphones
Headphones are listening devices that are placed over, on, or in the ears of a user depending on the
type at use.
Headphones allow a user to listen to the desired sound that the user wants to hear such as music, a
tape recording.
MicrophoneWhen people wish to communicate to a large crowd or when they want to record sound, a
microphone is a valuable piece of equipment.