Lesson Notes By Weeks and Term - Senior Secondary School 1

SUBJECT: INFORMATION COMMUNICATION TECHNOLOGY

CLASS:  SS 1

DATE:

TERM: 2nd TERM

 
WEEK ONE

TOPIC: INPUT DEVICES

Reference book: Hiit @ School, Computer Studies for Senior Secondary Education.

CONTENT

Input device is any peripheral device that is used to provide data and control signals to a computer.  

Types of input devices are: Keyboard, Mouse, Scanner, Microphone, Joystick, Card readers, Light pen, Digital camera etc

The keyboard is a panel of keys used as an input device to enter text characters and other commands into the computer. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. A standard desktop computer keyboards have 101 keys which include alphabetic characters, punctuation symbols, numbers and a variety of function keys. However, today most users use the QWERTY style keyboards. 

TYPES OF KEYBOARD

There are two types of keyboard.  These are:

1. Standard keyboard
2. Enhanced keyboard

STANDARD KEYBOARD 

This is a keyboard that has between 84 – 89 keys.  It has 10 function keys and 4 arrow keys.

ENHANCED KEYBOARD 

 This keyboard has between 101 – 104 keys.  It has 12 function keys and 8 arrow keys.

Functions of the keyboard

1. A keyboard is used to input data into a computer.
2. It can be used to input commands and/ or instructions to a computer.
3. It provides quick access to menus on the computer.

Structure of a keyboard

The standard structure of a keyboard includes the following sections: numeric, character (capital and small letters), Control, alternative, function keys, navigational and special keys.

Function Keys: A function key is a key on a computer keyboard which can be programmed so as to cause an operating system command interpreter or application program to perform certain actions. On a standard keyboard, there are 12 function keys labeled F1, F2, F3, F4, F5, F6, F6, F7, F8, F9, F10, F11, and F12.

Numeric Keys: These are located on the right side of the keyboard. It contains number 0-9. The numeric keypad is active when Num Lock key is ON. 

Alternative Keys: these are used to alternate keyboard functions. There are the Alt key, Shift key, Alt Gr key, Num Lock. 

Alphabetic keys: these are keys with letters A-Z. They are 26 in number.

Arrow keys: these are navigational or directional keys. They are used to move the cursor either up or down, left or right on the screen.

Control keys: a control key is a modified key which, when pressed in conjunction with another key, will perform a special operation (for example, Control-Alt-Delete); similar to the Shift key, the Control key rarely performs any function when pressed by itself.

Special keys: these include the following keys: ENTER, HOME, END, PGUP, PGDN,DEL, INS, Backspace, ESC, SPACE, CTRL, ALT and SHIFT.

EVALUATION

1a.    Define input devices. 

1b.    Mention EIGHT input devices.

1c.    Define keyboard and list the TWO types of keyboard.

2a.    Mention any THREE sections of the keyboard.

2b.    List any FIVE special keys on the keyboard.

READING ASSIGNMENT: HiiT @ School, Computer Studies for Senior Secondary Education. Chapter Five, pages 14-15.

WEEKEND ASSIGNMENT

OBJECTIVES

1. ______ keyboard has 10 function keys.

 (a) Standard    (b) Enhanced    (c) Windows

2. The function keys are labelled ______on the keyboard.

  (a) Function     (b) F1 – F12      (c) 0 – 9

3. The keys with A – Z on the keyboard are called_______

   (a) Numeric keys    (b) Alphabet keys    (c) Arrow keys

4. ______ is the longest key on the keyboard.

   (a) Space bar key   (b) Delete key   (c) Enter key

5. _______keys are used to control the cursor.

   (a) Arrow    (b) Function    (c) Alphabet

THEORY

1a. What is a keyboard?

1b. Write short notes on: (a)    Standard keyboard         (b)    Enhanced keyboard

2a. Mention any FIVE sections of the keyboard.

2b. List any THREE special keys on the keyboard.

3.   State the functions of a keyboard.