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Digital Camera
Digital Camera captures the image or picture momentarily and converts the image
directly into digital form and stores it in memory. It can then be viewed on the computer
or compatible devices. It is available in various models with different specifications that
include pixels, sizes and memory. The quality of the image captured by a digital camera
is measured in pixels. Digital photo frame is a thin coloured screen in the form of a
picture frame. It can store photographs/images in its memory in the digital format and can be used for slide
show presentations.
Web Camera
A web camera or webcam is a type of video camera that saves images or visuals in real-time
into a computer via USB, Ethernet or Wi-Fi. Webcams are typically connected to a computer
via a USB port and are commonly used for video conferencing, online meetings, live streaming,
and video chatting. Some built-in webcams can be remotely activated from far-off locations.
Webcams can also be used for security & surveillance purposes by monitoring the captured visuals.
Output Devices
There are various types of output devices. Let’s learn about some of them.
Printer
Printer is a common output device that is used for the purpose of printing
documents. Printer generates a hard copy of data or information.
Characteristics of printers are as follows:
Quality of Printing: The quality of output produced by the printer can be
measured in units of dpi (dots per inch) which is also termed resolution.
Speed: The speed of different types of printers varies widely. The speed of a printer is measured in cps
(characters per second), ppm (pages per minute) or lpm (lines per minute).
Printing Mechanism: There are different types of mechanisms that are applied in different types of printers.
Some printers print by striking the printer head on the paper, some print by forming images on the paper,
some print by spraying ink, etc.
Based on the mechanism, printers can be broadly classified into two categories:
Impact Printer: Impact printer prints the contents by striking the printer head or needle, on an ink ribbon
that rolls through the cartridge to make a mark on the paper.
Non-Impact Printer: Non-Impact printer prints the output without touching or striking the ribbon on
paper or the film. This kind of printer prints by using thermal, chemical, electrostatic, laser beam or inkjet
technology. Usually, non-impact printer has greater resolution and is faster as compared to impact printer.
Plotter
Plotter is an output device that helps in printing high-quality posters, flexes, visuals,
charts, graphs, tables and diagrams, etc. It can draw continuous lines and can produce
output on paper, polyester film or coloured transparencies. In the plotter, the figures
are drawn by an electronic pen which is driven by a motor. It uses inkjet cartridges
(single or multicoloured) to spray colours for drawing and sketching.
Plotter is mostly used in CAD (Computer Aided Design), CAM (Computer Aided Manufacturing) and for
printing banner and DTP (Desktop Publishing) flexes.
50 Information Technology Play (Ver 1.0)-IX

