it for managers 4
TRANSCRIPT
8/8/2019 IT for Managers 4
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C
h a p
t e r
11
Information Technology for
Managers
Information Technology for
ManagersSession 4
By
Arun Mishra
8/8/2019 IT for Managers 4
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Learning ObjectivesLearning Objectives
In this session you will learn about:
• Types of Input Devices
• Functions of Input devices.• Types of Output devices.
• Functions of output devices.
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Input-Output DevicesInput-Output Devices
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Input DevicesInput Devices
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Keyboard
• Keyboards are designed for the input of text and
characters and also to control the operation of a
computer.
• The number of keys on a keyboard varies from theoriginal standard of 101 keys to the 104-key windows
keyboards• Types of keyboards
• General Purpose keyboard• Special Purpose Keyboard
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Mouse
• A mouse (plural mice or mouses) functions as a pointing
device by detecting two-dimensional motion relative to its
supporting surface.
• Can be used only with GUI (Graphical user interface)
based OS. E.g. Windows.
• Types of mouse based on mechanism
1. Mechanical Mouse2. Optical Mouse
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Mechanical MouseMechanical Mouse
A mouse that uses a rubber ball that makes
contact with wheels inside the unit when it
is rolled on a pad or desktop.
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Optical MouseOptical Mouse
• A mouse that uses light to
detect movement.
• It emits a light and senses its
reflection as it is moved.• Early optical mice required a
special mouse pad, but today's
devices can be rolled over
traditional pads like amechanical mouse as well as
over almost any surface other
than glass or mirror.
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Data Scanning DevicesData Scanning Devices
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Image Scanner Image Scanner
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Types of Image Scanner Types of Image Scanner
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Types of Image Scanner Types of Image Scanner
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Types of Image Scanner Types of Image Scanner
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Types of Image Scanner Types of Image Scanner
Optical Character Recognition (OCR)
Optical Mark Reader (OMR).Bar-code Reader
Magnetic Ink Character Reader (MICR)
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Output DevicesOutput Devices
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MonitorsMonitors
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Printer
Peripheral device thatproduces outputs onto asheet of paper. Thispaper is referred to as a
hard copy.
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1.Dot Matrix Printer
2. Inkjet Printer
3. Laser Printer
Dot Matrix Printer
Laser printer
Inkjet Printer
Types of Printers
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Dot Matrix Printer
• Also called Impact printers (parts actually impact the paper)
Fires pins (or print wires) at an ink ribbon, which contacts the
paper and leaves a mark• The print head , which contains the pins, moves left to right
across the paper, line by line, creating letters out of the circular dots of ink that have impacted the paper.
• Coils of wires called solenoids are energized, thus creating an
electromagnet, and cause the pins to shoot forward and strike
the ribbon.
• Print quality is measured in "pins", as in 9-pin, 24-pin, 48-pinprinters: number of pins in the print head.
• The speed of the printer is measured in cps, characters per
second.• The paper most often used with dot matrix is continuous,
tractor-fed paper with perforated strips on the sides.
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Dot Matrix Printer
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Inkjet Printer
Inkjet printers use liquid ink-filled cartridges that force out
and spray ink at the page through tiny holes called
nozzles. The printer sprays ink at the page through pressure and
electricity. Normally, the pressure inside the ink cartridge (in the ink
reservoir ) is a bit less than pressure outside. When the deflection plates are electrically charged, ink is
forced out. Inkjet printers can use plain paper and inkjet specific
paper (for higher print quality). Print quality is measured in dpi , dots per inch. Print speed is measured in ppm, pages per minute.
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Print head Print head stepper
motor
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The majority of businesses use laser printers for
demanding printing needs (speed, quantity, quality).
Laser printers print one whole page at a time, andrequire RAM (more memory) to operate.
Print quality is measured as dpi
They are non-impact printersMost laser printers can print in black color only.
They can print many special characters, different sizes
of print, and graphics such as charts & graphs.
Laser Printer
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