Fetch-Decode-Execute Cycle and E-Safety

This section covers the fetch-decode-execute cycle and introduces important concepts related to online safety.

Fetch-Decode-Execute Cycle The document explains the basic steps of how a CPU processes instructions:

1. Fetch: The CPU retrieves the instruction from RAM.
2. Decode: The CPU interprets the instruction to determine what needs to be done.
3. Execute: The CPU carries out the instruction.

Highlight: The fetch-decode-execute cycle is a fundamental process in computer architecture, describing how the CPU handles instructions.

E-Safety The section on e-safety covers important aspects of staying safe online:

Definition: E-safety refers to understanding what information is safe to share online and what should be kept private.

Password Security:

• A good password should include a mix of random words, upper and lowercase letters, numbers, and symbols.
• Passwords should never be shared with others.

Online Gaming Safety: When encountering a problematic user in an online game, follow these steps:

1. Leave the game
2. Report the user
3. Block the user

Highlight: These steps are crucial for internet safety for 16-18 year olds and promote online safety for students.

Cyberbullying The document defines cyberbullying and its various forms:

Definition: Cyberbullying is bullying that occurs through digital devices like cell phones, computers, and tablets, via SMS, text, apps, or social media.

Digital Footprint The concept of a digital footprint is introduced:

Definition: A digital footprint is the trail of data and information left behind when using digital platforms, including intentional and unintentional records of online activities and interactions.

This information is particularly relevant for social media safety for teens and online safety for parents.

Logic Gates and Algorithms

This section covers fundamental concepts in computer science: logic gates and algorithms.

Logic Gates The document introduces three basic logic gates: AND, OR, and NOT. Truth tables are provided for each gate to illustrate their operations.

Example: AND Gate Truth Table

• Inputs $A, B$: 0,0 | 0,1 | 1,0 | 1,1
• Output $Y = A.B$: 0 | 0 | 0 | 1

Example: OR Gate Truth Table

• Inputs $A, B$: 0,0 | 0,1 | 1,0 | 1,1
• Output $Y = A+B$: 0 | 1 | 1 | 1

Example: NOT Gate Truth Table

• Input $A$: 0 | 1
• Output: 1 | 0

Algorithms The document defines algorithms and introduces two common searching algorithms:

Definition: An algorithm is a list of instructions used to solve a problem by breaking it down into steps that lead to a solution.

1. Binary Search: Can only be performed on sorted data Starts at the middle value and eliminates half the data in each step Repeats until the search element is found or determined not to exist
2. Linear Search: Can be performed on unsorted data Examines each element in turn until it finds a match or reaches the end of the list

Highlight: Understanding these algorithms is crucial for learning how to convert binary to denary in Python and implementing efficient search functions.

Flowchart Symbols and Computer Networks

This section introduces flowchart symbols and basic concepts of computer networks.

Flowchart Symbols The document provides a list of common flowchart symbols and their meanings:

1. Terminator $Oval$: Represents start or end points
2. Arrows: Show relationships between shapes
3. Input/Output $Parallelogram$: Represents input or output processes
4. Process $Rectangle$: Represents a process or action
5. Decision $Diamond$: Indicates a decision point
6. Function: Not explicitly defined in the provided text

Highlight: Flowcharts are essential tools for visualizing algorithms and processes in computer science.

Computer Networks The document introduces the concept of computer networks and their types:

Definition: A computer network is two or more computers connected together to share resources, most commonly an Internet connection, but also printers or file servers.

Types of Networks:

1. Local Area Network $LAN$: Connects computers in close proximity, usually within one building
2. Wide Area Network $WAN$: Connects computers in different buildings, cities, or countries The Internet is an example of a global WAN

Vocabulary: Network topology refers to the structure or arrangement of network elements. Common topologies include bus and star.

HTML $Hypertext Markup Language$ The document briefly mentions HTML:

Definition: HTML is the programming language that enables browsers to display text and graphics on a web page.

Target Audience The concept of target audience is introduced:

Definition: A target audience is the specific group of people for whom a product is made.

Highlight: Understanding networks and HTML is crucial for developing online safety for kids and promoting safe internet use.

Computer Networks Fundamentals

This section introduces basic networking concepts and topologies.

Definition: A computer network is an interconnected system of computers sharing resources.

Vocabulary:

• LAN $Local Area Network$: Connects nearby computers
• WAN $Wide Area Network$: Connects geographically distant computers

Highlight: Network topology refers to the physical or logical arrangement of network components.

Network Topologies and Web Technologies

This section covers specific network configurations and web-related technologies.

Definition: Network topology determines how devices in a network are connected and communicate.

Example: Bus topology connects all devices to a single cable, while star topology connects devices to a central hub.

Vocabulary: HTML $Hypertext Markup Language$ is the standard language for creating web pages.

Target Audience and Client Considerations

This section addresses the importance of identifying and understanding target audiences in product development.

Definition: Target audience refers to the specific group of people for whom a product or service is designed.

Highlight: Understanding your target audience is crucial for effective product development and marketing strategies.

Binary Number Systems and CPU Components

This section introduces binary number systems and CPU components, which are fundamental concepts in computer science.

Binary Number System The binary system uses only 0s and 1s to represent data, forming the foundation of digital technology. It corresponds to the on/off states in electrical systems.

Definition: Binary is a base-2 number system, while denary $decimal$ is a base-10 system.

Binary to Decimal Conversion The document provides a step-by-step example of converting binary to decimal:

Example: Converting 10110110 to decimal

1. Create a table with place values $128, 64, 32, 16, 8, 4, 2, 1$
2. Add the values where there's a 1 in the binary number
3. Result: 128 + 32 + 16 + 4 + 2 = 182

Decimal to Binary Conversion A reverse process is explained for converting decimal to binary:

Example: Converting 145 to binary

1. Create a binary table
2. Add 1s from left to right to reach the decimal number
3. Result: 10010001

CPU $Central Processing Unit$ The CPU is described as the brain of a computer system, processing data and executing instructions.

Vocabulary: Input devices $e.g., mouse, keyboard$ enter data into a computer, while output devices $e.g., monitor, printer$ display or output data.

What is a Computer? The document emphasizes that computers are programmable machines found in various everyday devices, not just PCs and laptops.

Highlight: A computer is an electronic device that takes in data/commands, processes it, and outputs the result.