3. INPUT DEVICES
•An input device is any hardware device that
sends data to a computer, allowing you to
interact with computer and control the
•The most commonly used or primary input
devices on a computer are the keyboard and
•A mouse is input device that controls a cursor
in a screen and select text, icons, files,
•The mouse is placed on a flat surface such as a
mouse pad or a desk and is placed in front of
•Biometrics is the identification of a person by
the measurement of their biological features.
•For example, a user identifying themselves by
their finger print is considered a biometrics
10. TYPES OF BIOMETRICS
•Hand scanner - A biometric hand scanner will
identify the person by the palm of their hand.
•Finger scanner - Finger scanner identifies the
person by their finger print. These can be a
secure method of identifying a person.
11. TYPES OF BIOMETRICS
•Retina or iris scanner - A biometric retina or iris
scanner identifies a person by scanning the iris
or retina of their eyes.
•Voice scanner - voice scanner will
mathematically break down a person's voice to
identify them. These scanners can help
•A scanner is a input device that optically
"reads" and image and converts it into a digital
•For example, a scanner may be used to convert
a picture or document(hard copy) into a digital
21. BARCODE READER/SCANNER
•Bar Code Reader is a device used for reading
bar coded data. Bar coded data is generally
used in labelling goods, numbering the books,
•It may be a handheld scanner or may be
embedded in a stationary scanner.
•Microphone is an input device to input sound
that is then stored in a digital form.
•The microphone is used for various applications
such as adding sound to a multimedia
presentation or for mixing music.
25. OUTPUT DEVICES
•An output device is any device that receives
data from a computer, usually for display or
•For example, the image shows a village, an
output device that can make a hard copy of any
information shown on your monitor.
•Printer is an output device, which is used to
print information on paper.
•Printer convert soft copy of data into hard copy
31. TYPES OF PRINTERS
•Line Printers: Line printers are the printers which
print one line at a time.
•Character Printers: Character printers are the
printers which print one character at a time.
•Laser Printers: They use laser lights to produce
the characters to be printed on a page.
• A computer speaker is a device that connects
to a computer to generate sound.
•The signal used to produce the sound that
comes from a computer speaker is created by
the computer's sound card.
•A projector is an output device that can take
images generated by a computer and
reproduce them onto a screen, wall, or other
•Typically, the surface projected onto is large,
flat, and lightly colored.