Computer Hardware Devices

A scanner is specifically designed to read text, bar codes, or images and convert them into digital data for the computer.

A microphone is an input device that captures audio and converts it into digital signals for the computer to process.

MICR stands for Magnetic Ink Character Recognition, a technology used primarily by the banking industry to facilitate the processing and clearance of cheques.

This device consists of a small rod used for controling the screen cursor.

GUI is a standard computing acronym that stands for Graphical User Interface, which allows users to interact with electronic devices through graphical icons.

A platen is a flat plate or roller in a device like a scanner or printer that holds the paper or document against the imaging mechanism.

Telegraph keys were used for communication, not for inputting data into computer systems in the way punch cards or tapes were.

A disk drive (such as a hard drive or floppy drive) acts as an input/output device, allowing the computer to read data from and write data to storage media.

A bezel is the frame or rim surrounding the screen of a monitor or display device.

A dumb terminal is a device that has no local processing power. It consists essentially of a keyboard for input and a Video Display Unit (VDU) for output.

PDA stands for Personal Digital Assistant, a term used for handheld devices that functioned as personal information managers.

A light pen is an input device that uses a light-sensitive detector to allow a user to point to displayed objects or draw on the screen in a similar way to a touchscreen.

Because there is four pin USB port in the system and the cable end A also have four pin connector.

A camera is a device which is used to view the object on a screen. Periscope is a device used to see the concealed positioned objects, a microscope to look the larger view of very small objects which are not visible with the naked eye. Mirror produces and image only till the time that a particular object is lying in its path.

Structure of a pinhole camera is easy and can be easily constructed at home by using general materials from the surroundings like cardboard trace paper etc. But digital camera, CD or cellophane sheet requires an expertise hand and some mechanical devices so cannot be constructed at home.