Computer Input Devices and Output Devices

Sections of the Keyboard The keyboard is categorized into five sections: Alphanumeric keys (Alphabet and Numbers): Comprising alphabet (a-z) and numbers (0-9). Function keys F1-F12: There are twelve function keys (F1-F12) located horizontally on the first row of enhanced keyboards. On standard keyboards, they are labelled F1-F10. III. Control keys – Del, Ctrl, Esc, and […]

Sections of the Keyboard

The keyboard is categorized into five sections:

  1. Alphanumeric keys (Alphabet and Numbers): Comprising alphabet (a-z) and numbers (0-9).
  2. Function keys F1-F12: There are twelve function keys (F1-F12) located horizontally on the first row of enhanced keyboards. On standard keyboards, they are labelled F1-F10.

III. Control keys – Del, Ctrl, Esc, and Alt: Used in conjunction with other keys to instruct the computer to perform specific tasks.

  1. Cursor-Control and screen movement keys – Arrow, home, end, page up, etc.: Allow the user to move the cursor left, right, up, and down one line.
  2. Numeric keypad: Usually situated at the extreme right-hand corner of modern keyboards and contains only numbers.

 

Features of the Keyboard

  1. Rollover Capability: The keyboard can register several keys pressed almost simultaneously in sequence, preventing jams and increasing operator input speed.
  2. Auto-Repeat Capability: Most keys have auto-repeat capability, repeating the operation when a key is depressed until it is released.

 

Uses of the Keyboard

It is used to:

  1. Enter text, numbers, and punctuation.
  2. In the absence of the mouse, it can be used to shut down the computer system.
  3. Ctrl + Alt + Del keys can be used to restart the computer during warm booting.

 

Mouse

The mouse, like the keyboard, is an interface for communication with a computer screen. It is used for drawing and plotting images.

 

Mice are grouped into two types:

  1. Optical mouse
  2. Ball track mouse

 

Basic Mouse Functions

  1. Clicking: Pressing and releasing a mouse button quickly at once.
  2. Double Clicking: Pressing and releasing the mouse button twice in rapid succession.
  3. Dragging: Pressing a mouse button while holding it down to move an object.

 

Point: Moving the mouse pointer to touch an item.

Functions of the Mouse

  1. It is used for drawing different kinds of objects.
  2. It is used to select items, menus, etc.
  3. It is used in moving, cutting, and pasting objects.

 

Features of the Computer Mouse

  1. It has right and left buttons.
  2. Mouse has a scroll button.
  3. Presence of a ball/laser underneath.

To use the mouse, you need just two fingers: your right thumb and the third finger. Your first finger should be on the left button, while the third finger should be on the right. These operations may vary from laptop to laptop.

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