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LOGIC GATES/CIRCUITS 1-2 (JS3 NOTES)

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  LOGIC GATES/CIRCUITS  1-2 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 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 digital logic ga...
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LAPTOP REPAIR AND INSTALLATION (PRACTICAL)

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  LAPTOP REPAIR, AND INSTALLATION Meaning of Laptop Repair Laptop repair is the process of diagnosing, fixing, replacing, or maintaining faulty hardware and software components of a laptop computer.     Main Parts of a Laptop External Parts: - Screen - Keyboard - Touchpad - USB ports - HDMI/VGA port - Power button - Charging port   Internal Parts: - Battery - HDD/SSD - RAM - Motherboard - Cooling fan - Processor (CPU)    Common Laptop Problems - Laptop not powering on - Battery not charging - Overheating - Slow performance - Broken screen - Keyboard not working - Virus infection - No sound output   Causes of Laptop Faults - Dust and dirt - Liquid spills - Power surge - Improper handling - Virus infection - Poor ventilation - Faulty charger   Basic Laptop Repair Tools - Screwdrivers - Soft brush - Compressed air - Multimeter - Cleaning cloth - Isopropyl alco...
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COMMUNICATION SYSTEMS 1 - MEANING AND TYPES - BROADCASTING - TELECOMMUNICATION - DATA NETWORK E.T.C

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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...
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DIGITAL TECHNOLOGIES SS3 (SCHEME OF WORK) FOR SECOND TERM 25/26 ACADEMIC SESSION

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  SS3 2 ND  TERM SCHEME OF WORK (DIGITAL TECHNOLOGIES) 1.   Networking 2 – Network Devices – Hub – NIC Card – The Switch – The Router – The Modem e.t.c   Networking 3 – Cables and Connectors ·       Network Cables– Twisted Pair Cable – Coaxial Cable – Fibre Optics Cable – Telephone Cable – Power Cable – Data Cables ·       Network Connectors – RJ 11, RJ 45, BNC T – Connector, Male and Female Connectors 2.  Database Management System – Definition, Basic Database Terminologies, Forms of Database ·       Practical (Database Management System)  3. High Level Language – Definition – Modes of Translation – Classification of High Level languages- Advantages of HLL & ML (Machine Language) 4. Overview of Number Base System – Conversion – Binary – Decimal – Octal – Hexadecimal Number System ·       Data Representation – Definition a...
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CYBER SECURITY AWARENESS MEANING OF CYBERSECURITY – CYBER SECURITY THREATS (SS1)

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  CYBER SECURITY AWARENESS MEANING OF CYBERSECURITY – CYBER SECURITY THREATS - VIRUSES, PHISHING AND SPOOFING, RANSOMWARE, PASSWORD ATTACK, INSIDER THREATS, DDOS ( DISTRIBUTED DENIAL OF SERVICE ) INTRODUCTION Cyber security awareness teaches people how to stay safe while using computers, mobile phones, and the internet. Many cyber-attacks succeed because users are not careful or informed. MEANING OF CYBERSECURITY Cyber security is the practice of protecting computers, mobile phones, networks, and data from unauthorized access, attacks, or damage. It helps to: (i) Protect personal information (ii) Prevent data loss (iii) Keep systems working properly   CYBER SECURITY THREATS A cyber security threat is any action or program that tries to harm a computer system, steal data, or disrupt services. Common cyber security threats are: (a) viruses (b)  Phishing and Spoofing (c) Ransomware (d) Password Attacks (e) Insider Threats (f) DDoS (Distributed Denial of Se...
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SS2 2ND TERM SCHEME OF WORK (DATA PROCESSING)

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  SS2 - 2 ND TERM SCHEME OF WORK (DATA PROCESSING) 1.    Entity Relationship Model – Definition, Features and Attribute 2.    Relational Models 1 – Definition and Creating and Modifying Relations Using SQL. 3.    Relational Models 2 –   Integrity Constraints over Relations, Enforcing Integrity and Quering. 4.    File Organization 1 – Definition and Types – Sequential – Serial – Index e.t.c ·      Factors to Consider when choosing a file organization method 5.    File Organization 2 – File extension (.jpg, .docx, .png, .xls) – clustered – Unclustered 6.    The Internet 1 – Definition, Internet Browser – Examples, Benefits and Abuses of the Internet ·      Internet Security 7.    Mid Term Break 8.    Presentation Package 1 – Meaning, examples, features and uses 9.    Presentation Package 2 -   Practical 10.   ...
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