computer science

1. OUTPUTANDINPUTDEVICES

2. INTRODUCTION
• The computer will be of no use if it is not communicating with the external world.Thus, a
computer must have a system to receive information from the outside world and must be able to
communicate results to the external world.Thus, a computer consists of input/output devices.
Input and output devices can also be written as I/O devices. Input and output devices of a
computer system are the devices that connect you to computer. Input devices let you to transfer
data and user command into the computer system. I/O devices are used to interact with the
computer system. For example, you can type in data by using a keyboard, or you can input data
in picture form by using a scanner in computer system. Inputs are data or signals received by the
computer system. An Input unit takes the input and converts it into binary form, so that it can be
understood by the computer 77 Input and Output Devices On the other hand, output devices
display the result of input data or signals after processing it. Examples of these could be your
computer’s monitor, which displays all the programs which are running on the computer, as well
as the printer, which will print out a hard copy of the information which is saved in your
computer.

3. Input devices
Manual input devices Direct data entry devices
1. Electronic whiteboard 1. Scanner
2. Mouse 2. Barcode reader
3. Joystick 3. Webcam
4. Touch screen 4. Camera
5. Graphics tablet
6. Microphone
7. Light pen
An input devicedevice that is used to input
information
There are different types of input devices
which are the manual input devices and the
direct data entry
• Manual input devices – used to enter
data by hand
• Direct data entry –can input large
amounts of data quickly and
automatically without the need of
human interaction

4. Advantages and disadvantages of input
devices
Advantages
• Very fast easy to enter options
• No training needed in order to
use them
Disadvantages
• Limited nimber of options on
sreen
• Expensive compared to other
devices

5. Output devices
• An output device is a device used to output information
• These devices are a lot here are some examples
• OUTPUT DEVICES: Monitor (LED, LCD, CRT etc)
Printers (all types) Plotters; Projector; LCD Projection
Panels; Computer Output Microfilm (COM) Speaker(s)
Head Phone;Visual Display Unit; Film Recorder;
Microfiche; Both Input–OutPut Devices: Modems;
Network cards;Touch Screen; 4. Headsets (Headset
consists of Speakers and Microphone.
One of the most important output devices is
-The monitor is an output device of the computer. It
displays user information in the form of pictures, videos,
and graphics.The content display on the monitor screen.
Desktop Monitor imageThis is a type of component of a
computer.To learn about components click here.