input output devices

1. I/O Devices
Input and Output Devices

2. Input Device
 An input device is any piece of hardware that allows
us to send data or information to a central
processing unit of a computer.
 Input devices helps human to either interact with or
control the computer.
 So if you type a message on a keyboard or touch a
screen to make something happen you're using an
input device.

3. Keyboard
 The keyboard has 104 keys.
 They are alphabet keys, number keys, function keys,
arrow keys, enter key, etc.
 By pressing the relevant keys, a user can enter data
and instructions to the computer.

4. Mouse
 A mouse interacts with a computer through a process
known as point and click.
 When a user moves the mouse, the pointer moves in a
corresponding direction on the computer's monitor
screen.
 A mouse can be wired or wireless. Scanner A scanner
is an input device that is used to transfer images or text
from books or paper into a computer.

5. Scanner
 A scanner is an input device that is used to
transfer images or text from books or paper
into a computer.

6. Joystick
 A joystick is an input device often used to control
video games.
 A joystick consists of a handle that pivots on a base
and sends its angle or direction to the computer as
data.

7. Microphone
 A microphone is used to record our voice and
different sounds into a computer.
 It also helps us to chat with our friends through
internet.

8. Light pen
 Light pen allows the user to point to
displayed objects on the computer
screen.
 It is used to write or draw on the
computer screen.

9. Webcam
 Webcam is an input device
connected to the computer and
can capture photographs and
videos.
 Webcams are more often used to
live stream videos or perform
video chats.

10. Sensor
 An input device that takes readings
from the environment such as
temperature, light and motion.
Obviously, each type of sensor works in
a completely different way.
 An example of where this could be used
is a thermostat that detects temperature
and turns your heating on or off.

11. Output Device
 An output device on the other hand is any piece of
hardware that allows a computer to communicate
information to us.
 An output device receives data or information from
the central processing unit.
 Using the output devices, a computer can interact
with the human.
 For example displaying a message on a screen,
playing sound via a speaker or headphones or
printing a document.

12. Monitor
 A device that outputs a visual display of
the user interface of any software that
is currently being used on the
computer.
 We use it so we can see the data we
are working with and can interact with
it.
 Without the monitor, we wouldn’t be
able to see the effect of our inputs.

13. Printer
 It can print both in black and white, or color.
 The printed copy on a paper is called the hard copy.

14. Plotter
 Plotter is an output device much like a printer.
 Instead of toner, plotters use a pen, pencil, marker,
or another writing tool to draw multiple continuous
lines onto paper.

15. Speaker
 Speaker allow us to listen to music, and hear sound
effects stored in a computer.

16. Headphones
 Headphones are used to
listen to music as well as
record sounds without
disturbing others.

17. Projector
 A projector is an output device that projects an
image from the computer onto a large surface, such
as a white screen. Question time.

18. Actuator
 An output device that produces motion.
 We use it to control or move things.
 They are commonly used with sensors.
 An example could be an actuator that turns
our heating on or off.
 There are different types of actuators that
produce different motion and that can affect
the measures of performance.