1. PERIPHERAL DEVICES

2. PERIPHERALS
 The term peripherals refers to all hardware
devices that are attached to the computer
and are controlled by the computer system
 Peripherals can be classified into input
devices and output devices.
 Some can be both an input device and an
output device

4. INPUT DEVICES
 An input device is a piece of equipment that enables
data to be entered into a computer for example:
 Mouse
 Keyboard
 Joystick
 Microphone
 Digital Camera
 Scanner

5. KEYBOARDS
 The keyboard is made up of push-button switches
which send a signal to the CPU each time you
press them.
 Keyboard standards vary with names like Deluxe,
Natural and Cordless.

6. TYPES OF KEYS IN A KEYBOARD
 Alphabet keys: ( A, B, : : : , Z).
 Number keys: (1,2,3,….0)
 Numeric Keypad: (numeric keys on right
side).
 Function keys: F1, F2, : : : on top row.
 Special keys: Ctrl, Alt, Shift, backspace.
 Arrow keys: Left, Right, Up, Down keys.

8. MOUSE
 It is used to control the cursor or pointer on
the screen and to give commands to the
computer. It allows operations to be
performed without having to remember
complicated keyboard commands.
 A roller mouse has a ball that is rolled as the
mouse is moved about on the desktop.

9. Mechanical Mouse

10.  Optical mice use a light instead of a ball. Able to
work on almost any surface without a mouse pad.

11. Cordless Mouse

12. Joystick
A joystick looks like car’s stick shift.
Controls objects on screen.

13. DIGITAL CAMERAS
 Allow us to capture images and transfer
them to a computer in the form of an image
file.
 Some digital cameras can
capture small amounts of video.

14. SCANNERS
 Scanner is a light sensitive device that helps you
copy or capture images, photos, and artwork
that exist on paper and converts it into digital
form that can be processed and stored by the
computer.

15. Webcam
A webcam is a video camera that feeds its image
to a computer or computer network. Their most
popular use is the establishment of video links,
permitting computers to act as
videophones or videoconference stations

16. Microphone
It is used as an audio-input device. The
function of microphone is to enter/record
sound into computer.

17. Bar Code Reader
A barcode reader is an electronic device for
reading printed bar codes. Bar code reader
helps identify a product.

18. OUTPUT DEVICES
 Output devices take information within your
computer and present it to you in a form that
you can understand
Main output devices:
 Monitors
 Printers
 Speakers

19. MONITORS
 The monitor or visual display unit (VDU) is the
most significant output device.
 Desktop displays use a cathode
ray tube (CRT)

20. LCD Monitor

21. PRINTERS
 Laser – Expensive, used mostly in medium
to large organizations

22. Ink Jet – Typically found in small
businesses

23. Dot Matrix – Found mostly in large
organizations for printing process
reports and large volumes of data

24. PRINTERS
 Speed – measured in Pages Per Minute
(PPM)
 Quality – measured in Dots Per Inch (DPI)
 The higher the DPI the better the print
quality

25. Speaker
A speaker is a device that produces
computer output in form of sound

26. Projectors
A multimedia projector is a compact, high
resolution, full-color projector capable of
projecting text, images, video and audio content.

29. In class rooms