Course Content
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All Study Notes
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Introduction
Chapter-1. Computational Modelling
We will discuss Machines and Computational modeling, the Input-process-output model, input-process-output-storage model.
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Lesson-1.1.1- Machines and Computational modelling (input-process-output) model, (input-process-output-storage) model
01:37:56
Assignments-1.1
Quiz-1.1
Chapter-2. Computer Hardware
We will discuss Von Neumann Computational Model, Hardware components of a computer system, cache memory, Fetch-Decode-Execute Model, Fetch-Decode-Execute Cycle, Secondary Storage (Magnetic, Optical, Solid State Drive SSD), Magnetic secondary storage - hard disks, Optical secondary storage – CD, DVDs, Electrical secondary storage - flash drives, Cloud Storage, Embedded systems
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Lesson-2.1.1- Hardware (Von Neumann Computational Model), RAM, ROM, Cache Memory
40:00
Lesson-2.1.2- Fetch-Decode-Execute Model, Fetch-Decode-Execute Cycle
40:00
Lesson-2.1.3- Secondary Storage ( Magnetic secondary storage – hard disks, Optical secondary storage – CD, DVDs, Electrical secondary storage – flash drives), Cloud Storage, Embedder System.
40:00
Assignments-2.1
Quiz-2.1
Chapter-3. Computer Logic
We will discuss Logic, logic gates (AND, OR, NOT gates), truth tables, conditional statements.
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Lesson-3.1.1- Logic, Logic gates ( AND, OR, NOT)
40:00
Lesson-3.1.2- Logic (Truth Table, conditional statements)
40:00
Assignments-3.1
Quiz-3.1
Chapter-4. Software
We will discuss software (System software, application software, utility software), Operating system, features of the operating system, File management tool, security tools, Computer Simulation, and modeling.
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Lesson-4.1.1- Software , System Software (Operating System)
40:00
Lesson-4.1.2- Application Software, Utility Software, File management tools, Security tools, Computer Simulation and modelling
40:00
Assignments-4.1
Quiz-4.1
Chapter-5. Programing language
we will discuss definitions of Programing language, types of Programing language, Low-Level Programming Language, High-Level Programing Language, machine code or machine language, Assembly language, Advantage & Disadvantages of assembly language, Compiler & Interpreter, Advantage & Disadvantages of Compiler & Interpreter.
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Lesson5.1.1- Low-Level Programming Language, High-Level Programing Language, Assembly language, Compiler & Interpreter
40:00
Assignments-5.1
Quiz-5.1
Chapter-6. Networks
We will learn the definition of network, the purpose of using the network, different types of network (LAN, WLAN, WAN, Computer Network Models, The processes of accessing a server for getting services, Network Topologies (BUS, RING, Star, Mesh Topology) Communication media, Advantage and disadvantages of wired, wireless communication media, Network data speed, Definition of protocol and features of the protocol, different types of protocol, email protocols (SMTP, POP3, IMAP), TCP protocol, TCP/IP Protocol, HTTP/ HTTPS Internet protocol. Network security, The Importance of Network Security, Firewall, The use of Firewall, The security and advantages of cloud storage, The Security and disadvantages of cloud storage, NAS (network-attached storage), Cyber-attack (Phishing, Shoulder Surfing, Unpatched software, USB devices, Eavesdropping), Protecting against security weaknesses, Security measures to protect from cyber-attacks, Reviews of network and user policies.
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Lesson-6.1.1- Definition of Network, Purpose of using Network, Different types of Network (LAN, WLAN, WAN)
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Lesson-6.1.2- Computer Network Models ( Client-Server, Peer-2-peer), The processes of accessing a server for getting services, Network Topologies (BUS, RING, STAR, MESH Topology)
40:00
Lesson-6.1.3- Communication media (Wired, Wireless), Advantage & Disadvantage of Wired, Wireless Media, Network data speed, Calculating the time needed to transmit a file
40:00
Lesson-6.1.4- Protocols, Email protocols (SMTP, POP3, IMAP), Differences between SMTP, POP3, and IMAP protocol
40:00
Lesson-6.1.5- Network protocols (TCP, TCP/IP), HTTP, HTTPS, IP (Internet protocol), The format of IP addresses differs between the versions
40:00
Assignments-6.1
Quiz-6.1.1
Quiz-6.1.2
Lesson-6.2.1- Network security, The effect of Virus or denial of service (DoS) attacks, The Importance of Network Security, Firewall, The use of Firewall, Physical Security
40:00
Lesson-6.2.2- Cloud Storage, The security and advantages of cloud storage, The Security and disadvantages of cloud storage, NAS (network-attached storage),
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Lesson-6.2.3- Cyber-attack, Cyber-attack is designed for, Types of cyber-attack (Phishing, Shoulder Surfing, Unpatched software, USB devices, Eavesdropping), Protecting against security weaknesses, Security measures to protect from cyber-attacks
40:00
Assignments-6.2
Quiz-6.2.1
Quiz-6.2.2
Chapter-7. The internet and the world wide web
We will Learn Internet, How the internet works, WWW (World Wide Web), Accessing the World Wide Web, How the World Wide Web works
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Lesson-7.1.1- The definition of Internet, How does the internet works, WWW (World Wide Web), Accessing the World Wide Web, How the World Wide Web works
40:00
Assignments-7.1
Quiz-7.1
Chapter-8. Computing and the environment
We will learn Computing and the environment, Advantage & Disadvantage of Computing to the environment, Manufacture, Raw material extraction, Production Most hazardous materials used in the manufacture of computing technology, Usages of Computing technology, Disposal of Computing technology, How computing technology preserving the environment.
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Lesson-8.1.1- Computing and the environment, Advantage & Disadvantage of Computing technology, Manufacture (Raw material extraction, Production, Usages, Disposal), How computing technology preserving the environment.
50:00
Assignments-8.1
Quiz-8.1
Chapter-9. Computer Privacy
We will learn Privacy, Personal Data, UK Data Protection Act (1998) Big data, How Big Data Works, The Uses of Big Data Surveillance, Advantages of surveillance technology location-based service (LBS), how do location-based services work, Uses of location-based services Privacy Enhancing Technologies (PET), Privacy-enhancing tools Cyber Security, The computer misuse act 1990
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Lesson-9.1.1- Privacy, Personal Data, UK Data Protection Act (1998), Big data, How Big Data Works, The Uses of Big Data
30:00
Lesson-9.1.2- Surveillance, Advantages of surveillance technology, location-based service (LBS), how does location based services work, Uses of location-based services, Privacy Enhancing Technologies (PET), Privacy enhancing tools, Cyber Security, The computer misuse act 1990
40:00
Assignments-9.1
Quiz-9.1
Chapter-10. Digital Inclusion
We will learn about Digital Inclusion, Challenges for Digital Inclusion, Solutions, Impact and Advantage of Digital Inclusion, Moving Toward Digital Inclusion,
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Lesson-10.1.1- Definition of Digital inclusion, Challenges & Solutions for Digital Inclusion, Impact and Advantage of Digital Inclusion, Impact and Advantage of Digital Inclusion, Moving Toward Digital Inclusion
40:00
Assignments-10.1
Quiz-10.1
Chapter-11. Professionalism
We will learn about Professionalism, Importance of Professionalism, the professional standards by the British Computer Society (BCS).
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Lesson-11.1.1- Definitions of Professionalism, Impacts of Professionalism, the professional standards by British Computer Society (BCS).
40:00
Assignments-11.1
Quiz-11.1
Chapter-12. the Legal Impacts
We will learn about, Intellectual property, Copyright and patents, The Copyright, Designs, and Patents Act (1988), Licensing, The terms of a Software license, Creative Commons license, Open-source and proprietary software Advantage and disadvantages of open-source software
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Lesson-12.1.1- Definition of Intellectual property, The Copyright, Designs and Patents Act (1988), Licensing,
30:00
Lesson-12.1.2- The terms of a software license, A Creative Commons license , Open-source and proprietary software, Advantage and disadvantages of open-source software
30:00
Assignments-12.1
Qioz-12.1
Chapter-13. Algorithm
We will learn about the definition of Algorithm, Criteria for a successful algorithm, Relationship between algorithm & Program, Flowcharts, The algorithm, for making a cup of coffee, Pseudo-code, Algorithm for adding two numbers, Arithmetic Operators, Variables, Constants, Selection, Iteration, Representation of selection & iteration in a flowchart, Representation of selection & iteration in Pseudo-code, Relational operator is an operator that compares two values, Nested Selection, Nested Selection pseudo-code, Indefinite iteration, Definite iteration, Logical Operators (AND, OR, NOT), NESTED LOOPS, Random Number
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Lesson-13.1.1- The definitions of Algorithm, Criteria for successful algorithm, Relationship between algorithm & Program, Flowcharts
40:00
Lesson-13.1.2- Algorithm, for making a cup of coffee, Pseudo-code,
40:00
Lesson-13.1.3- Algorithm for adding two numbers, Arithmetic Operators
40:00
Lesson-13.1.4- Variable, Identifier, Arithmetic operator, Constant, Construct, Selection, Iteration, Representation of selection & iteration in flowchart
40:00
Lesson-13.1.5- Representation of selection & iteration in Pseudo-code, Relational operator
40:00
Lesson-13.1.6- Nested Selection, Nested Selection pseudo-code
40:00
Lesson-13.1.7- Indefinite iteration, Definite iteration
40:00
Lesson-13.1.8- Logical Operators (AND, OR, NOT Operator), NESTED LOOPS, Random Number
40:00
Assignments-13.1
Assignments-13.2
Assignments-13.3
Quiz-13.1
Quiz-13.2
Quiz-13.3
Chapter-14. Binary Numbers
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Lesson-14.1.1- Understanding that computers use binary to represent data (numbers, text, sound, graphics) and program instructions.
00:00
Lesson-14.1.2- Understanding how computers represent and manipulate numbers (unsigned integers, signed integers (sign and magnitude, two’s complement)).
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Lesson-14.1.3- convert between binary and denary whole numbers (0–255).
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Lesson-14.1.4- perform binary arithmetic (add, shifts (logical and arithmetic)) and understand the concept of overflow.
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Lesson-14.1.5- hexadecimal notation is used and be able to convert between hexadecimal and binary.
00:00
Assignments-14.1
Quiz-14.1
Chapter-15. Data Representation
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Lesson-15.1.1- how computers encode characters using ASCII and Unicode.
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Lesson-15.1.2- how bitmap images are represented in binary (pixels, resolution, color depth).
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Lesson-15.1.3- how sound, an analogue signal, is represented in binary.
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Lesson-15.1.4- the limitations of binary representation of data (sampling frequency, resolution) when constructed by the number of available bits.
00:00
Assignments-15.1
Quiz-15.1
Chapter-16. Data Storage, Compression, and, Encryption
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Lesson-16.1.1- how to use and convert between binary and denary multiples (as defined by the International Electrotechnical Commission (IEC)): • bit • nibble • byte • kibibyte (KiB) 210 • mebibyte (MiB) 220 • gibibyte (GiB) 230 • tebibyte (TiB) 240 • kilobyte (kB), 103 • megabyte (MB) 106 • gigabyte (GB) 109 • terabyte (TB) 1012.
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Lesson-16.1.2- the need for data compression and methods of compressing data (lossless, lossy), and that JPEG and MP3 are examples of lossy algorithms.
00:00
Lesson-16.1.3- how a lossless, run-length encoding (RLE) algorithm works.
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Lesson-16.1.4- file storage is measured in bytes and be able to calculate file sizes.
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Lesson-16.2.1- Data Encryptions, the need for data encryption.
00:00
Assignments-16.1
Quiz-16.1
Lesson-16.2.2- how encryption algorithms work (Pigpen cipher, Caesar cipher, Vigenère cipher, Rail Fence cipher).
00:00
Assignments-16.2
Quiz-16.2
Chapter-17. Working With Algorithm
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Lesson-17.1.1- the purpose of a given algorithm and how an algorithm works.
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Lesson-17.1.2- how to determine the correct output of an algorithm for a given set of data.
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Lesson-17.1.3- how to identify and correct errors in algorithms, including using trace tables.
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Lesson-17.1.4- how to code an algorithm in a high-level language.
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Lesson-17.1.5- how the choice of algorithm is influenced by the data structures and data values that need to be manipulated.
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Lesson-17.1.6- how standard algorithms work (bubble sort, merge sort, linear search, binary search).
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Lesson-17.1.7- evaluate the fitness for purpose of algorithms in meeting specified requirements efficiently, using logical reasoning and test data.
00:00
Assignments-17.1
Quiz-17.1
Lesson-17.2.1- Analyze a problem, investigate requirements (inputs, outputs, processing, initialization) and design solutions.
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Lesson-17.2.2- decompose a problem into smaller sub-problems.
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Lesson-17.2.3- how abstraction can be used effectively to model aspects of the real world.
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Lesson-17.2.4- how abstraction can be used effectively to model aspects of the real world.
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Assignments-17.2
Quiz-17.2
Chapter-18. Programming
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Lesson-18.1.1- Algorithm and Program, write programs in a high-level programming language.
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Lesson-18.1.2- the benefit of producing programs that are easy to read and be able to use techniques (comments, descriptive names (variables, constants, subprograms), indentation) to improve readability and to explain how the code works.
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Lesson-18.1.3- differentiate between types of error in programs (logic, syntax, runtime).
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Lesson-18.1.4- design and use test plans and test data (normal, boundary, erroneous).
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Lesson-18.1.5- interpret error messages and identify, locate and fix errors in a program.
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Lesson-18.1.6- determine what value a variable will hold at a given point in a program (trace table)
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Lesson-18.1.7- determine the strengths and weaknesses of a program and suggest improvements.
00:00
Assignments-18.1
Quiz-18.1
Lesson-18.2.1- the structural components of a program (variable and type declarations, command sequences, selection, iteration, data structures, subprograms).
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Lesson-18.2.2- The use of sequencing, selection and iteration constructs in their programs.
00:00
Assignments-18.2
Quiz-18.2
Lesson-18.3.1- the need for, and understand how to use, data types (integer, real, Boolean, char, string).
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Lesson-18.3.2- the need for, and understand how to use, data structures (records, one-dimensional arrays, two-dimensional arrays).
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Lesson-18.3.3- the need for, and how to manipulate, strings.
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Lesson-18.3.4- the need for, and how to use, variables and constants.
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Lesson-18.3.5- the need for, and how to use, global and local variables when implementing subprograms.
00:00
Assignments-18.3
Quiz-18.3
Lesson-18.4.1- how to write code that accepts and responds appropriately to user input.
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Lesson-18.4.2- the need for, and how to implement, validation.
00:00
Lesson-18.4.3- write code that reads/writes from/to a text file.
00:00
Assignments-18.4
Quiz-18.4
Lesson-18.5.1- the purpose of, and how to use, arithmetic operators (add, subtract, divide, multiply, modulus, integer division).
00:00
Lesson-18.5.2- the purpose of, and how to use, relational operators (equal to, less than, greater than, not equal to, less than or equal to, greater than or equal to).
00:00
Lesson-18.5.3- the purpose of, and how to use, logic operators (AND, OR, NOT).
00:00
Assignments-18.5
Quiz-18.5
Lesson-18.6.1- the benefits of using subprograms and be able to write code that uses user-written and pre-existing (built-in, library) subprograms.
00:00
Lesson-18.6.2- the concept of passing data into and out of subprograms (procedures, functions).
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Lesson-18.6.3- create subprograms that use parameters.
00:00
Assignments-18.6
Quiz-18.6
Test Yourself
You can test your current situation on this course.
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Final Mock-1
Final Mock-2
Final Mock-3
Final Mock-4
Final Mock-5
Exploring Edexcel OLevel Computer Science Unlocking the Potential of Technology
    About Lesson

    General-purpose computers

    A general-purpose computer is a computer that is designed to be able to carry out many different tasks. Desktop computers and laptops are examples of general-purpose computers. Among other things, they can be used to:

    • access the internet

    • browse the world wide web (WWW)

    • use word processing software

    • play games

    • communicate via email and social media

    • design and build web pages

    • store and retrieve data

    • play videos and music

    Each of these tasks is called an application. Any computer that can have many applications, such as those listed, is a general-purpose computer.

    Apart from desktop computers and laptops, the following devices are also general-purpose computers:

    • tablets – like desktop computers, they can run a variety of applications

    • smartphones – today’s smartphones can also run a variety of applications

    • games consoles – as well as games, modern consoles also enable users to watch videos, play music, and browse the internet

    • media systems in cars – allow users to navigate, listen to music and connect to a smartphone

    Hardware and software

    General-purpose computers consist of hardware and software. Hardware is the physical components of the computer, such as the central processing unit (CPU), hard disk, monitor, keyboard, and mouse. Software is the programs that run on a computer.

     

    Hardware is the physical component of a computer. Software is the programs that run on a computer.

    The general-purpose computer model

    All general-purpose computers follow the same basic model.

    This diagram illustrates the flow of data within a desktop computer. Data is input, processed, then either output or sent to secondary storage. It is held in the main memory while it is being processed.

    The CPU receives instructions and data from an input or memory. The instructions and data are processed by the CPU and the results are either sent to output or transferred to secondary storage.

    Input is from an input device such as a keyboard, mouse, camera, or scanner. Output is to an output device, such as a monitor, printer or speaker.

     

    THE CPU processes data/instructions and controls the computer system.

    The purpose of the CPU

    The CPU is the most important hardware component in a computer. It has two main functions:

    • to process data and instructions

    • to control the rest of the computer system

    All programs and data processing is run in the CPU and all hardware components are, to some extent, controlled by it.

    The Input-process-output model:

    A computer is a machine that takes some kind of input from its surroundings, processes the input according to given rules, and provides some kind of output.

    You are probably familiar with a desktop computer. The keyboard provides input and the screen provides output (which depends on what you type). In a similar way, the embedded computer in a washing machine has controls that provide input and a motor and heater as outputs; how fast they spin and how much heat they produce depends on the input setting.

    The clever bit in computer science is the activity that goes on between the inputs and outputs – the processing. Processing means performing a series of actions on the inputs according to a given set of rules.

     

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