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When a key is pressed, it signals the computer to display the corresponding character or
function on the screen instantly, ensuring accurate input.
Mouse: A mouse is a common input device used to control the pointer (cursor)
on a computer screen. It can be either wired or wireless, often connecting through
Bluetooth. A standard mouse has two buttons (left-click and right-click) and a
scroll wheel. The buttons let you perform different tasks in software. The mouse
helps you select options, move the cursor, and drag and drop files or items. The
scroll wheel lets you quickly move through long documents or web pages.
Scanner: A scanner is an input device that changes physical
documents, pictures, and photos into digital files. It allows users to
capture handwritten or printed materials and send them to a
computer, where they can be saved, edited, or shared.
Touchpad: Touchpads are an alternative
to the traditional mouse, commonly found on laptops. They allow
users to control the cursor’s movement on a screen by using their
fingers or a stylus on a flat surface.
Light Pen: A light pen is a pen-shaped pointing device with a light-
sensitive tip that lets users interact directly with a computer screen.
By pointing, users can select or draw on the screen.
Microphone: A microphone turns sound into digital audio so it can be saved
or processed by a computer. It captures sound and is important for activities
like recording, making voice calls, and recognising speech.
Barcode Reader: A barcode is a set of parallel lines that helps
identify products. Most packages have these barcodes, which can
be easily read by barcode scanners. The scanner shines light on
the barcode and detects the light that bounces back. The scanned
information is then saved on a computer, often used for invoicing.
Magnetic Ink Character Recognition: Bank
account numbers and other details on cheques are printed with a special
magnetic ink, which can be read by Magnetic Ink Character Recognition
(MICR). This technology helps verify whether a cheque is genuine or
counterfeit.
Digital Camera: A digital camera can serve as an input device by
capturing visual information in the form of images and videos. It can be
easily transferred to a computer for further processing, analysis, or
storage.
Graphics Tablet: A graphics tablet, is a type of input device that
consists of a flat, rectangular surface with a stylus (digital pen) used for
drawing, writing, and interacting with graphical applications. It also takes
handwritten work as an input and converts it into digital form.
14 Information Technology (V5.0)-VII

