Page 17 - ICT_for_JHS_2_Classical

Chapter 2 - Basic Input Devices and their Functions

What is an Input Device?

An input device is any hardware device that sends data to a computer, allowing
interaction and control the computer. E.g. Keyboard, Mouse, Microphone,
Camera / Webcam, Scanner, Light Pen, Touchscreen (Finger), Stylus, Digitizer,
Barcode Code Reader, Trackball, Biometrics (Finger) Scanner, Joy Stick, etc.

Types and Functions of Input Devices

Keyboard

The computer keyboard is a wide rectangular object that is equipped with
buttons on which there are letters (alphabets), numbers, and other characters and
symbols. The keyboard is like a typewriter. It consists of a series of keys that

can be pressed to input commands or letters. The keyboard is sometimes called
QWERTY Keyboard.

The name QWERTY is derived from the first six letters in the top- left alphabet

row. The QWERTY layout was originally designed for typewriters, not
computers and was meant to prevent typewriter keys from jamming. QWERTY
is considered inefficient because it slows typing speeds. Because of the slowness
of the QWERTY keyboard, DVORAK Keyboard was invented.

DVORAK keyboard is designed to so that the middle row keys include the
most common letters. In addition, common letter combinations are positioned in
such a way that they can be typed quickly.

Functions:
1. It is used to write documents
2. It is used to navigate user interfaces in lieu of a mouse.
3. It is used to send commands/instructions to computer.

Mouse

The computer mouse is a funny looking object that frankly looks like a real
mouse. Originally, computers came with keywords without mouse. But in 1988,
Dong Engelhardt invented the mouse.

The mouse is handheld pointing device that allows you to control the actions of