Input Devices

Input Devices You need to know about a range of input devices. You are expected to be able to ‘describe, commenting on their ergonomic design….’ Ergonomic design means: A design which is made for ease of use and prevention of long lasting injuries caused through use of normal designs. You need to describe the device, not what it does. There is a subtle but important difference here. It is tempting when describing a mouse to say ‘it is moved around the screen, it points and selects things’. For this syllabus, that is not what they are looking for. You need to provide a description of the input device i.e. It is a palm shaped piece of equipment. Most have two buttons, although some have three. It can either be attached to the computer by a wire or can be wireless and controlled by infra red or radio waves ……….. and so on’ Input Device Keyboard

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Mouse Trackball Joystick  www.teach-ict.com All Rights Reserved

Description An input device modelled as arrangement of buttons / keys to act as electronic switches or mechanical levers. Keyboard distinguishes each key from other and reports key presses to the controlling software. Keyboards are also used for gaming or to give commands to the operating system. There are also numeric keyboard which contains only numbers and also few mathematical symbols, such as subtraction, addition and others.

Ergonomic design Is a keyboard designed using ergonomic design, especially to give user more comfort, and allows users to type at a different angle as to minimize muscle strain in wrist.

Touch screen

Graphics tablet Numeric keypad

Scanner Microphone

Digital Camera

Foot Mouse Puff suck switch Push switch  www.teach-ict.com All Rights Reserved

OCR ADC Sensor

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