JSS 1 WEEK TWO LESSON NOTE (ICT_323)

 

Jss1

TOPIC: THE DEVICE

Introduction

In computer technology, a device is a unit of hardware outside or inside the case or housing for the essential computer that is capable of providing input to the essential computer or of receiving output or both.

 

The Device

A device is any machine or tool used or a particular purpose. It can include keyboard, mouse, display monitor, hard disk drives, CD rom players, printer, audio speakers, microphones and other hardware units.

 

Classes of device

1.       Early counting devices: early counting devices are devices that were used by man for counting during the primitive era. E.g finger, stone, marbles, etc

2.       Mechanical device: mechanical devices are devices that were used to perform mechanical function before the invention of the more sophisticated computer system. E.g  abacus, slide rule, etc. they perform the function without making use of electricity.

3.       Electronic devices: electronic devices are devices that make use of high voltage electricity e.g electric grinding machine, printing machine.

4.       Electronic device: electronic devices on these parts are devices that use relatively low voltage supply e.g computer system, home appliances such as television, radio and also office appliances.







Comments

Post a Comment

Popular posts from this blog

JSS 2 WEEK TWO LESSON NOTE_FIRST TERM 2023

Image
  Jss2 TOPIC: CLASSIFICATION OF COMPUTER BY GENERATION OBJECTIVE At the end of this topic you should be able to:  1. List the criteria for classifying computers.          I.                   2. State the features of computers classified based on technological age. Introduction Computers can be classified into different categories based on different criteria. Basically, computers can be classified based on the following criteria: 1.      Size. 2.      Types 3.      Generation 4.      Purpose or versatility Based on the technological Age of the computer, computers can be classified into: ·         First generation ·         Second generation ·         Th...
Read more

SSS TWO WEEK TWO LESSON NOTE (ICT_223)

Image
  Ss2 TOPIC:   HANDLING COMPUTER FILES Introduction File operation deals with the physical movement of data in and out of files. User programs effectively use file operations through appropriate programming language syntax. The file management system manages the independent files and acts as the software interfaces between the user programs and file operations. Basic Operations of Computer Files 1.     Insertion: records must be inserted at the place dictated by the sequence of the keys. As   obvious, direct insertion into the main data file would   lead to frequent rebuilding of the file. This problem could be mitigated by reserving overflow areas in the file for insertions. But this leads to wastage of space and also the overflow areas may also be filled. 2.     Deletion: deletion is the reverse of insertion. The space occupied by the record should be free for use. 3.     Updating: updating is a combinat...
Read more

JSS ONE WEEK THREE LESSON NOTE (ICT_223)

Image
  Jss1 TOPIC:   MASTERY OF THE KEYBOARD Introduction A computer keyboard is the most commonly used input device. It is defined as the set of typewriter-like keys that enables you to enter data into a computer or other devices. Computer keyboard are similar to electric-typewriters but contain additional typing keys. The standard arrangement of alphabetic keys on the keyboard is known as the QWERTY. The computer keyboard could be wired or wireless. Types of keyboard There are different types of keyboard depending on what they are used for. Some have more keys than the others. Keyboards also come in different shapes but basically a keyboard has regular shape. The types of keyboards are: a)      Enhanced keyboard b)     Standard keyboard   c)      Windows keyboard d)     AT keyboard   Sections of the Keyboard The keyboard is divided into the following sections: ...
Read more