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Barcode Reader: It uses a laser or camera to scan the barcode.
These Barcodes are a series of vertical lines or patterns that represent
data such as product details, prices, or identification numbers. Barcode
readers are commonly used in stores, warehouses, libraries, and more.
People at the counter in the shopping malls use barcode readers to
scan product barcodes and then generate the bill.
Scanner: It is an input device that is used to convert physical
documents, photos, or objects into digital form so that they can be
stored and processed on a computer. It captures images or text from
paper and turns them into digital files.
Processing Device
The Central Processing Unit (CPU) is often called the "brain" of the computer. It’s the part of the
computer that carries out most of the instructions, does the calculations, and makes sure that
everything runs smoothly.
Main parts of a CPU are as follows:
a. Control Unit (CU): It tells other parts of the computer what to do. It controls the flow of data
and ensures everything works together.
b. Arithmetic Logic Unit (ALU): It performs calculations and logical operations like adding
numbers or comparing data.
c. Memory Unit (MU): It stores temporary information that the CPU might need while working.
It acts like a small storage area inside the CPU.
Output Devices
Output devices are used to display output processed by the computer. When you use a computer,
you might want to see a picture, listen to music, or print a document. Output devices help you
achieve all this. Some of the commonly used output devices are as follows:
Monitor (Visual Display Unit): It is the main output device of the
computer. When you use a computer, it processes data and sends that
information to the monitor. The monitor then displays this information in
the form of text, images, and videos, allowing you to see what the computer
is doing.
Printer: It is an output device that makes an exact copy of what you see
on the screen on the paper. This copy is also known as hardcopy. There are
different types of printers available in the market such as Inkjet, Laser and
Dot matrix printers.
Plotter: It is a special type of printer used to create large and detailed
images, drawings, and graphics on paper. It uses a pen or a series of pens
to draw continuous lines. This feature helps in getting a precise image on
the paper.
Speaker: A speaker is an output device that produces sounds from videos, or
any other audio content played through your computer or device.
14 Information Technology (V5.0)-VI

