Educational Blog - Ajiboye Gbenga @ Sunlite Digital ALBESTA ACADEMY LEKKI

CONCEPT OF COMPUTER FILES 2  FILE ORGANIZTION: MEANING AND TYPES OF FILES ORGANIZATION -SERIAL -SEQUENTIAL - INDEXED AND RANDOM MEANING OF FILE ORGANIZATION The term "file organization" refers to how data are stored in a file and, consequently, the method by which it can be accessed. Types of File Organization There are mainly four types of file organization: 1. Serial file organization 2. Sequential file organization 3. Index file organization 4. Random file organization 1. Serial file organization Serial file is one in which the records have been stored in the order in which they have arisen. Serial files are stored in chronological order, that is, as each record is received it is stored in the next available storage position. In general, it is only used on a serial medium such as magnetic tape. 2. Sequential file organization Sequential files are files whose records are sorted and stored in ascending or descending on a particular key field. Records are organized in the seq...

COMMUNICATION SYSTEMS 1   MEANING AND TYPES - BROADCASTING - TELECOMMUNICATION - DATA NETWORK MEANING OF ICT ICT is an acronym that stands for Information and Communication Technology. Information is referred to knowledge obtained from reading, investigating, studying and researching. It can also be defined as processed data. Communication is an act of transmitting messages. Technology is the application of scientific knowledge for practical purposes, especially in industry. It is also defined as the use of a diverse set of technological tools and resources to communicate, create, disseminate, store and manage information. Communication strategies in ICT There are two types of communication strategies in ICT: 1. Synchronous communication This is a communication strategy where all parties involved in the communication need to be present and available at the same time. E.g. online chat, video conferencing, etc. 2. Asynchronous communication Asynchronous communication does not re...

  KODU GAME LAB (PRACTICAL) Kodu lets kids create games on the PC via a simple visual programming language. Kodu can be used to teach creativity, problem solving, storytelling, as well as programming. Anyone can use Kodu to make a game, young children as well as adults with no design or programming skills.

  CONCEPT OF COMPUTER FILES  DEFINITION OF TERMS (COMPUTER FILE, RECORD, FIELD, AND DATA ITEMS) DEFINITION OF COMPUTER FILE 1. A computer file is defined as the smallest meaningful unit of data representation within a computer. 2. A computer file is a block of arbitrary information, or resource for storing information, which is available to a computer program and usually on some kind of durable storage. FILE FUNCTIONS Files are used to do one or more of the following functions: a. They provide machine-executable code b. They store application programs or operating system configuration c. They store data used by the users such as Microsoft Word files. COMPUTER FILE TERMS 1. Record:  A record is a collection of related fields. 2. Field:  Field is a single piece of information about an object. A field is also defined as a space that holds specific parts of data from a set or a record. Examples of fields are NAME, ADDRESS, QUANTITY, AGE , etc. 3. Data element:  A da...

  COMPUTER ETHICS   MEANING, MANAGEMENT, AND RULES Objective:  At the end of the lesson, the students should be able to (i) Define computer ethics (ii) State computer room rules and regulations Definition of Computer Ethic s Computer ethics is a set of moral principles that regulate the use of computers. Computer Room Management Ethics The computer room should be managed properly. Unlike our homes, we need to keep a computer room in a good condition always by: 1. Making it free of dust: we should endeavour to dust our computers every day after sweeping the room. After some time, a computer engineer should use a blower to blow off the dust from within the computer. 2. Maintaining appropriate lighting: A computer room must not be dark while computers are being used. 3. Maintaining adequate and appropriate ventilation: A cooling system is necessary all the time for our computers. Fans and air conditioners should be used always to avoid computers being dam...

FILE INSECURITY/SECURITY 2  MAINTENANCE, PREVENTIVE MEASURES AND LEGAL ISSUES  PREVENTIVE MEASURES TO DATA LOSS 1. Use of antivirus software e.g Norton, McAfee, Avast, etc 2. Use of firewall: A firewall is a software utility or hardware device that acts as a filter for data entering or leaving a network or computer. 3. Exercising care in giving out vital and personal information 4. Proper network implementation and management 5. Exercising care in opening email attachments. 6. Ensure personal information  is not disclosed 7. Keep your system updated. 8. Do not download file attachment from unknown sources 9. Use Encryption :    method by which information is converted into secret code that hides the information's true meaning LEGAL ISSUES IN COMPUTER SECURITY The common computer security issues are: 1. Piracy 2. Cyber Crime 3. Identity Theft 4. Internet Fraud 5. Hacking 1. Piracy  : T he use and or distribution of copyrighted computer software in violation ...

 LOGIC GATES/CIRCUITS  1 INTRODUCTION/DEFINITION, TYPES, SYMBOLS AND USES Objective:  At the end of the lesson, the students should be able to: 1. Define logic gates 2. State the types of logic gate 3. Draw logic gates symbols 4.State the uses of logic gates DEFINITION OF LOGIC GATES A logic gate is an elementary building block of a digital circuit. M ost logic gates have two inputs and one output. At any given moment, every terminal is in one of the two binary conditions low (0) or high (1), represented by different voltage levels. Types of Standard Single Logic gate There are three types of standard single logic gates. They are: 1. AND gate 2. OR gate 3. NOT gate Alternative Logic Gates are: 4. NAND gate 5. NOR gate 6. EX -OR (Exclusive OR) gate 1.    AND gate :  AND gate will give a high output only if all of the inputs are high. It means multiplication (x). For example if A = 0 and B= 1, A AND B = 0 X 1 = 0 AND GATE SYMBOL 2. OR gate : This  is a d...

      BASIC PROGRAMMING LANGUAGE 1 ORIGIN, MEANING, BASIC CHARACTERS, BASIC STATEMENT, AND BASIC ARITHMETIC OPERATORS Objective:  At the end of the lesson, the students should be able to: 1. Define BASIC programming language. 2. State what BASIC stands for 3.  List the BASIC characters, statements, and arithmetic operators ORIGIN AND MEANING OF BASIC BASIC stands for  B eginner’s  A ll-purpose  S ymbolic  I nstruction  C ode . It was developed in 1960 by John Kemeny and Thomas Kurtz to teach students at Dartmouth College. It has undergone a series of historical development, which has resulted in several forms of the language. BASIC is now in form of VB.NET (Visual Basic.Net).Examples of interpreters in BASIC are: (i) BASICA (ii) GwBASIC (iii) Turbo BASIC (iv) Quick BASIC (v) BASIC 256 BASIC CHARACTERS There are three types of characters used in BASIC. These are:  (1) alphabetic - (A - Z) (2) numeric/Digits (0-9) (3) special characte...

  THE SYSTEM UNIT: MEANING, COMPONENTS,  INTERNAL AND EXTERNAL FEATURES OF THE SYSTEM UNIT Objective:  At the end of the lesson, the students should be able to: i. Define the system unit ii. List the internal and external parts of the system unit THE MEANING OF THE SYSTEM UNIT A System unit is the electronic circuitry housed within the  computer  cabinet.  It is a rectangular box of the   computer  that contains the motherboard, the Central Processing Unit (CPU), random access memory and storage devices. THE INTERNAL AND EXTERNAL FEATURES OF THE SYSTEM UNIT INTERNAL PARTS OF THE SYSTEM UNIT The major internal parts of the system unit are: Motherboard, power supply, cooling fans, internal disk drives, the memory modules and expansion cards that are plugged into the motherboard such as video and network cards. T HE EXTERNAL FEATURES OF SYSTEM UNITS                             ...