GCSE Digital Technology - ALL TOPICS SA

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Questions and Answers

What is the difference between analogue and digital data?

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.

What are binary digits?

Binary digits, or bits, are the smallest pieces of data that a computer can process/store.

Why do digital devices need analogue data to be converted into binary before they can use it?

Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.

Give an example of an analogue device.

Examples of analogue devices include clocks and thermometers. Signup and view all the answers

Give an example of a digital device.

Examples of digital devices include smartphones and digital cameras. Signup and view all the answers

What are the advantages and disadvantages of magnetic storage mediums?

Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage. Signup and view all the answers

What are the advantages and disadvantages of optical storage mediums?

Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos. Signup and view all the answers

What are the advantages and disadvantages of solid-state storage?

Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive. Signup and view all the answers

What is cloud storage?

Cloud storage stores data remotely online and can be accessed from anywhere with a network connection. Signup and view all the answers

What is an analogue to digital converter (ADC)?

An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data. Signup and view all the answers

What is image resolution?

Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes. Signup and view all the answers

What is the difference between lossless and lossy image compression?

Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes. Signup and view all the answers

What is the difference between analogue and digital data?

Analogue data is continuous and used by humans, while digital data is discrete and used by computers. Signup and view all the answers

What are binary digits or bits?

Binary digits, or bits, are the smallest pieces of data that a computer can process/store. Signup and view all the answers

Why does all data need to be converted into binary before a computer can use it?

Digital devices cannot process analogue information. Signup and view all the answers

What are examples of analogue and digital devices?

Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras. Signup and view all the answers

What are the advantages and disadvantages of magnetic storage mediums?

Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage. Signup and view all the answers

What are the advantages and disadvantages of optical storage mediums?

Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos. Signup and view all the answers

What are the advantages and disadvantages of solid-state storage?

Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive. Signup and view all the answers

What is cloud storage?

Cloud storage stores data remotely online and can be accessed from anywhere with a network connection. Signup and view all the answers

What is an analogue to digital converter (ADC)?

An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data. Signup and view all the answers

What are the advantages and disadvantages of uncompressed and compressed digital sound formats?

Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality. Signup and view all the answers

What is image resolution?

Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes. Signup and view all the answers

What is the system life cycle for creating a new ICT system?

The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation. Signup and view all the answers

What are the advantages and disadvantages of using the grandfather-father-son backup method for data storage?

Advantages include easy management and recovery of data, while disadvantages include slower backup times and the potential for data loss if one backup fails. Signup and view all the answers

What is a recovery point objective in a disaster recovery plan?

The recovery point objective is the point in time to which data must be restored after a system failure. Signup and view all the answers

What is the difference between parallel and big bang implementation methods for digital systems?

Parallel implementation involves running the new and old systems simultaneously, while big bang involves switching over to the new system all at once. Signup and view all the answers

What is the purpose of an anti-virus software?

The purpose of anti-virus software is to detect and notify the user of virus signatures on a computer system. Signup and view all the answers

What are the advantages and disadvantages of using cloud storage for data storage?

Advantages include remote access and easier scalability, while disadvantages include security concerns and potential downtime. Signup and view all the answers

What is the system life cycle for creating a new ICT system, and what does each stage involve?

The system life cycle involves investigation, analysis, design, implementation, maintenance, and evaluation. Investigation involves identifying user requirements, analysis involves evaluating the existing system, design involves creating a plan for the new system, implementation involves building and testing the system, maintenance involves ongoing support and updates, and evaluation involves determining how well the system meets requirements. Signup and view all the answers

What is the difference between lossless and lossy compression in digital sound?

Lossless compression maintains sound quality while reducing file size, while lossy compression sacrifices quality for smaller file sizes. Signup and view all the answers

What are the advantages and disadvantages of using virtual reality in education?

Advantages include immersive learning experiences, while disadvantages include potential distractions from the main point of a lesson. Signup and view all the answers

What is the difference between industrial and autonomous robots?

Industrial robots are programmed to perform specific tasks, while autonomous robots have the ability to make their own decisions. Signup and view all the answers

What is the process of taking regular measurements of sound waves and converting them into digital data called?

Sampling Signup and view all the answers

What determines the quality of digital sound?

Sampling rate and bit depth Signup and view all the answers

Which image format is made up of pixels and is often larger in size?

Bitmap Signup and view all the answers

What is the difference between lossless and lossy image compression?

Lossless maintains image quality, while lossy sacrifices quality for smaller file sizes Signup and view all the answers

What is the system life cycle for creating a new ICT system?

Investigation, analysis, design, implementation, maintenance, and evaluation Signup and view all the answers

What is the method of taking regular measurements of sound waves and converting them into digital data?

Sampling Signup and view all the answers

What is the difference between industrial and autonomous robots?

Autonomous robots have the ability to make their own decisions Signup and view all the answers

What is the difference between full, incremental, differential, and grandfather-father-son methods of data backup?

Each method has advantages and disadvantages Signup and view all the answers

What are the threats to data and what are the prevention strategies?

Phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks; employing ethical hackers, identifying vulnerabilities, and implementing security measures Signup and view all the answers

What is the process of converting analogue sound into digital data called?

Sampling Signup and view all the answers

What determines the quality of digital sound?

Sampling rate and bit depth Signup and view all the answers

What is the difference between bitmap and vector images?

Bitmap images are made up of pixels, while vector images are made up of mathematical calculations Signup and view all the answers

What is the difference between lossless and lossy image compression?

Lossless maintains image quality, while lossy sacrifices quality for smaller file sizes Signup and view all the answers

What is the difference between full, incremental, differential, and grandfather-father-son backup methods?

Each method has advantages and disadvantages Signup and view all the answers

What is a disaster recovery plan?

A plan for companies in case of system failure Signup and view all the answers

What is the difference between pilot, parallel, and big bang implementation methods?

Each method has advantages and disadvantages Signup and view all the answers

What are the advantages and disadvantages of autonomous cars?

Advantages include fewer accidents, while disadvantages include job losses for taxi and bus drivers Signup and view all the answers

What is the impact of robotics on society, culture, and the economy?

The loss of lower-skilled jobs and the creation of highly skilled new roles Signup and view all the answers

Which of the following is a method used during the investigation stage of the system life cycle?

Observing staff to identify user requirements Signup and view all the answers

What determines the quality of digital sound?

Sampling rate and bit depth Signup and view all the answers

Which of the following is a disadvantage of using compressed formats for digital sound?

Lower quality Signup and view all the answers

Which of the following is a method for data storage that is NOT listed in the text?

Cassette tape Signup and view all the answers

What is the difference between bitmap and vector images?

Bitmap images are made up of mathematical calculations Signup and view all the answers

Which of the following is a disadvantage of using lossy image compression?

Loss of image quality Signup and view all the answers

What is the purpose of a disaster recovery plan for companies?

To plan for system failure Signup and view all the answers

What is the difference between industrial and autonomous robots?

Autonomous robots have the ability to make their own decisions Signup and view all the answers

What are the advantages and disadvantages of using augmented reality in neurosurgery?

Advantage: Increased precision; Disadvantage: High cost Signup and view all the answers

What is the process of taking regular measurements of sound waves and converting them into digital data called?

Sampling Signup and view all the answers

Which factor determines the quality of digital sound?

Both sampling rate and bit depth Signup and view all the answers

Which type of image is made up of pixels and is often larger in size?

Bitmap Signup and view all the answers

Which image format sacrifices quality for smaller file sizes?

JPEG Signup and view all the answers

Which method of implementing digital systems involves running the new system alongside the old system?

Parallel Signup and view all the answers

Which type of software is customized for a specific company's needs?

Bespoke Signup and view all the answers

Which backup method only backs up data that has changed since the last full backup?

Incremental Signup and view all the answers

Which type of storage medium uses magnetizable coatings to store data?

Magnetic Signup and view all the answers

Which notable figure in the history of computing is known for creating the first algorithm?

Ada Lovelace Signup and view all the answers

What is the process of converting analogue sound into digital data called?

Sampling Signup and view all the answers

What determines the quality of digital sound?

Sampling rate and bit depth Signup and view all the answers

What are the advantages and disadvantages of using uncompressed formats for digital sound?

Higher quality but larger file sizes Signup and view all the answers

What are bitmap images made up of?

Pixels Signup and view all the answers

What is image resolution?

The number of pixels in an image Signup and view all the answers

What is lossy image compression?

Compression that sacrifices quality for smaller file sizes Signup and view all the answers

What is the difference between industrial and autonomous robots?

Autonomous robots have the ability to make their own decisions Signup and view all the answers

What are the advantages and disadvantages of autonomous cars?

Fewer accidents but job losses for taxi and bus drivers Signup and view all the answers

What is the impact of robotics on society, culture, and the economy?

Loss of lower-skilled jobs and creation of highly skilled new roles Signup and view all the answers

Study Notes

GCSE Digital Technology: Measuring and Storing Digital Data

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.
Binary digits, or bits, are the smallest pieces of data that a computer can process/store.
Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.
Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras.
Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage.
Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos.
Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive.
Cloud storage stores data remotely online and can be accessed from anywhere with a network connection.
Digital sound must be converted from analogue to digital data before it can be processed by a computer.
An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data.
Digital images can be stored as bitmap or vector images, and compression techniques are used to reduce file size.
Revision activities include identifying the difference between analogue and digital data, matching facts to analogue and digital devices, and understanding storage mediums and conversion processes.Understanding Digital Sound and Images
Digital sound is produced by converting analogue sound into digital data using an analogue-to-digital converter (ADC).
Digital sound can be edited on a computer and then converted back to analogue sound using a digital-to-analogue converter (DAC).
Sampling is the process of taking regular measurements of sound waves and converting them into digital data.
The quality of digital sound is determined by two factors: the sampling rate (measured in Hz) and the bit depth (number of bits per sample).
Digital sound can be stored in uncompressed formats (such as WAV and FLAC) or compressed formats (such as MP3 and WMA).
Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality.
Bitmap images are made up of pixels and are often larger in size, while vector images are made up of mathematical calculations and are smaller in size.
Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes.
Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes.
The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation.
Investigation involves methods such as questionnaires, interviews, and observing staff to identify user requirements and problems with the existing system.
Evaluation involves determining how well the new system meets initial requirements, identifying necessary changes, and planning for continued evolution.Digital Technology Summary
Different types of software include off-the-shelf, BPM, CRM, ERP, educational, resource management, time management, and bespoke software.
Bespoke software is customized for a specific company's needs, but it can be expensive and time-consuming to develop.
Anti-virus software detects virus signatures on a computer system and notifies the user to take action.
Features of anti-virus software include secure banking, parental control, anti-phishing, VPN, anti-ransomware, support, and notifications.
Backups can be performed using full, incremental, differential, or grandfather-father-son methods, each with advantages and disadvantages.
USB flash drives, external hard drives, solid-state media, and cloud storage are all options for data storage, each with their own pros and cons.
A disaster recovery plan is necessary for companies in case of system failure, and should include a recovery time objective, a recovery point objective, and regular testing and verification.
To determine the reliability of online sources, it is important to check for facts, judgement, bias, plagiarism, recognition, correctness, and accreditation, and to use multiple trustworthy sources.
Implementation methods for digital systems include pilot, parallel, and big bang, each with their own advantages and disadvantages.
Marketing methods include email, advertising through websites, social media marketing, influencer marketing, data mining, customer segmentation, product recommendation, and pricing strategies.
Monetizing content can be achieved through affiliate links or requesting donations.
Threats to data include phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks, and prevention strategies include employing ethical hackers, identifying vulnerabilities, and implementing security measures.WJEC GCSE Digital Technology Revision Notes
The concept of digital footprints and how they are used for monitoring current and prospective employees, security, and businesses.
Notable figures in the history of computing, including Ada Lovelace, Grace Hopper, and Steve Jobs.
Examples of industrial robots used in manufacturing, such as welding, painting, assembling, palleting, packaging, and labeling.
The impact of robotics on society, culture, and the economy, including the loss of lower-skilled jobs and the creation of highly skilled new roles.
The difference between industrial and autonomous robots, with the latter having the ability to make their own decisions.
Advantages and disadvantages of autonomous cars, including fewer accidents and job losses for taxi and bus drivers.
Social, economic, legal, and ethical impacts of autonomous cars, such as who would be at fault in the event of a crash and whether they should be programmed to protect the occupants or the most lives.
The concept of virtual reality and its application in education, such as exploring historical sites and viewing scientific phenomena.
Advantages and disadvantages of virtual reality, including its immersive nature and potential distraction from the main point of a lesson.
Industries using virtual reality, such as education, military, medicine, and mental health.
Examples of how virtual reality is being used to improve certain areas, such as training for military personnel, medical simulations, and treatment for mental health disorders.
The use of augmented reality in navigation systems, sports broadcasting, and neurosurgery.

GCSE Digital Technology: Measuring and Storing Digital Data

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.
Binary digits, or bits, are the smallest pieces of data that a computer can process/store.
Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.
Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras.
Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage.
Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos.
Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive.
Cloud storage stores data remotely online and can be accessed from anywhere with a network connection.
Digital sound must be converted from analogue to digital data before it can be processed by a computer.
An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data.
Digital images can be stored as bitmap or vector images, and compression techniques are used to reduce file size.
Revision activities include identifying the difference between analogue and digital data, matching facts to analogue and digital devices, and understanding storage mediums and conversion processes.Understanding Digital Sound and Images
Digital sound is produced by converting analogue sound into digital data using an analogue-to-digital converter (ADC).
Digital sound can be edited on a computer and then converted back to analogue sound using a digital-to-analogue converter (DAC).
Sampling is the process of taking regular measurements of sound waves and converting them into digital data.
The quality of digital sound is determined by two factors: the sampling rate (measured in Hz) and the bit depth (number of bits per sample).
Digital sound can be stored in uncompressed formats (such as WAV and FLAC) or compressed formats (such as MP3 and WMA).
Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality.
Bitmap images are made up of pixels and are often larger in size, while vector images are made up of mathematical calculations and are smaller in size.
Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes.
Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes.
The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation.
Investigation involves methods such as questionnaires, interviews, and observing staff to identify user requirements and problems with the existing system.
Evaluation involves determining how well the new system meets initial requirements, identifying necessary changes, and planning for continued evolution.Digital Technology Summary
Different types of software include off-the-shelf, BPM, CRM, ERP, educational, resource management, time management, and bespoke software.
Bespoke software is customized for a specific company's needs, but it can be expensive and time-consuming to develop.
Anti-virus software detects virus signatures on a computer system and notifies the user to take action.
Features of anti-virus software include secure banking, parental control, anti-phishing, VPN, anti-ransomware, support, and notifications.
Backups can be performed using full, incremental, differential, or grandfather-father-son methods, each with advantages and disadvantages.
USB flash drives, external hard drives, solid-state media, and cloud storage are all options for data storage, each with their own pros and cons.
A disaster recovery plan is necessary for companies in case of system failure, and should include a recovery time objective, a recovery point objective, and regular testing and verification.
To determine the reliability of online sources, it is important to check for facts, judgement, bias, plagiarism, recognition, correctness, and accreditation, and to use multiple trustworthy sources.
Implementation methods for digital systems include pilot, parallel, and big bang, each with their own advantages and disadvantages.
Marketing methods include email, advertising through websites, social media marketing, influencer marketing, data mining, customer segmentation, product recommendation, and pricing strategies.
Monetizing content can be achieved through affiliate links or requesting donations.
Threats to data include phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks, and prevention strategies include employing ethical hackers, identifying vulnerabilities, and implementing security measures.WJEC GCSE Digital Technology Revision Notes
The concept of digital footprints and how they are used for monitoring current and prospective employees, security, and businesses.
Notable figures in the history of computing, including Ada Lovelace, Grace Hopper, and Steve Jobs.
Examples of industrial robots used in manufacturing, such as welding, painting, assembling, palleting, packaging, and labeling.
The impact of robotics on society, culture, and the economy, including the loss of lower-skilled jobs and the creation of highly skilled new roles.
The difference between industrial and autonomous robots, with the latter having the ability to make their own decisions.
Advantages and disadvantages of autonomous cars, including fewer accidents and job losses for taxi and bus drivers.
Social, economic, legal, and ethical impacts of autonomous cars, such as who would be at fault in the event of a crash and whether they should be programmed to protect the occupants or the most lives.
The concept of virtual reality and its application in education, such as exploring historical sites and viewing scientific phenomena.
Advantages and disadvantages of virtual reality, including its immersive nature and potential distraction from the main point of a lesson.
Industries using virtual reality, such as education, military, medicine, and mental health.
Examples of how virtual reality is being used to improve certain areas, such as training for military personnel, medical simulations, and treatment for mental health disorders.
The use of augmented reality in navigation systems, sports broadcasting, and neurosurgery.

GCSE Digital Technology: Measuring and Storing Digital Data

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.
Binary digits, or bits, are the smallest pieces of data that a computer can process/store.
Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.
Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras.
Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage.
Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos.
Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive.
Cloud storage stores data remotely online and can be accessed from anywhere with a network connection.
Digital sound must be converted from analogue to digital data before it can be processed by a computer.
An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data.
Digital images can be stored as bitmap or vector images, and compression techniques are used to reduce file size.
Revision activities include identifying the difference between analogue and digital data, matching facts to analogue and digital devices, and understanding storage mediums and conversion processes.Understanding Digital Sound and Images
Digital sound is produced by converting analogue sound into digital data using an analogue-to-digital converter (ADC).
Digital sound can be edited on a computer and then converted back to analogue sound using a digital-to-analogue converter (DAC).
Sampling is the process of taking regular measurements of sound waves and converting them into digital data.
The quality of digital sound is determined by two factors: the sampling rate (measured in Hz) and the bit depth (number of bits per sample).
Digital sound can be stored in uncompressed formats (such as WAV and FLAC) or compressed formats (such as MP3 and WMA).
Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality.
Bitmap images are made up of pixels and are often larger in size, while vector images are made up of mathematical calculations and are smaller in size.
Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes.
Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes.
The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation.
Investigation involves methods such as questionnaires, interviews, and observing staff to identify user requirements and problems with the existing system.
Evaluation involves determining how well the new system meets initial requirements, identifying necessary changes, and planning for continued evolution.Digital Technology Summary
Different types of software include off-the-shelf, BPM, CRM, ERP, educational, resource management, time management, and bespoke software.
Bespoke software is customized for a specific company's needs, but it can be expensive and time-consuming to develop.
Anti-virus software detects virus signatures on a computer system and notifies the user to take action.
Features of anti-virus software include secure banking, parental control, anti-phishing, VPN, anti-ransomware, support, and notifications.
Backups can be performed using full, incremental, differential, or grandfather-father-son methods, each with advantages and disadvantages.
USB flash drives, external hard drives, solid-state media, and cloud storage are all options for data storage, each with their own pros and cons.
A disaster recovery plan is necessary for companies in case of system failure, and should include a recovery time objective, a recovery point objective, and regular testing and verification.
To determine the reliability of online sources, it is important to check for facts, judgement, bias, plagiarism, recognition, correctness, and accreditation, and to use multiple trustworthy sources.
Implementation methods for digital systems include pilot, parallel, and big bang, each with their own advantages and disadvantages.
Marketing methods include email, advertising through websites, social media marketing, influencer marketing, data mining, customer segmentation, product recommendation, and pricing strategies.
Monetizing content can be achieved through affiliate links or requesting donations.
Threats to data include phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks, and prevention strategies include employing ethical hackers, identifying vulnerabilities, and implementing security measures.WJEC GCSE Digital Technology Revision Notes
The concept of digital footprints and how they are used for monitoring current and prospective employees, security, and businesses.
Notable figures in the history of computing, including Ada Lovelace, Grace Hopper, and Steve Jobs.
Examples of industrial robots used in manufacturing, such as welding, painting, assembling, palleting, packaging, and labeling.
The impact of robotics on society, culture, and the economy, including the loss of lower-skilled jobs and the creation of highly skilled new roles.
The difference between industrial and autonomous robots, with the latter having the ability to make their own decisions.
Advantages and disadvantages of autonomous cars, including fewer accidents and job losses for taxi and bus drivers.
Social, economic, legal, and ethical impacts of autonomous cars, such as who would be at fault in the event of a crash and whether they should be programmed to protect the occupants or the most lives.
The concept of virtual reality and its application in education, such as exploring historical sites and viewing scientific phenomena.
Advantages and disadvantages of virtual reality, including its immersive nature and potential distraction from the main point of a lesson.
Industries using virtual reality, such as education, military, medicine, and mental health.
Examples of how virtual reality is being used to improve certain areas, such as training for military personnel, medical simulations, and treatment for mental health disorders.
The use of augmented reality in navigation systems, sports broadcasting, and neurosurgery.

GCSE Digital Technology: Measuring and Storing Digital Data

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.
Binary digits, or bits, are the smallest pieces of data that a computer can process/store.
Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.
Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras.
Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage.
Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos.
Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive.
Cloud storage stores data remotely online and can be accessed from anywhere with a network connection.
Digital sound must be converted from analogue to digital data before it can be processed by a computer.
An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data.
Digital images can be stored as bitmap or vector images, and compression techniques are used to reduce file size.
Revision activities include identifying the difference between analogue and digital data, matching facts to analogue and digital devices, and understanding storage mediums and conversion processes.Understanding Digital Sound and Images
Digital sound is produced by converting analogue sound into digital data using an analogue-to-digital converter (ADC).
Digital sound can be edited on a computer and then converted back to analogue sound using a digital-to-analogue converter (DAC).
Sampling is the process of taking regular measurements of sound waves and converting them into digital data.
The quality of digital sound is determined by two factors: the sampling rate (measured in Hz) and the bit depth (number of bits per sample).
Digital sound can be stored in uncompressed formats (such as WAV and FLAC) or compressed formats (such as MP3 and WMA).
Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality.
Bitmap images are made up of pixels and are often larger in size, while vector images are made up of mathematical calculations and are smaller in size.
Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes.
Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes.
The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation.
Investigation involves methods such as questionnaires, interviews, and observing staff to identify user requirements and problems with the existing system.
Evaluation involves determining how well the new system meets initial requirements, identifying necessary changes, and planning for continued evolution.Digital Technology Summary
Different types of software include off-the-shelf, BPM, CRM, ERP, educational, resource management, time management, and bespoke software.
Bespoke software is customized for a specific company's needs, but it can be expensive and time-consuming to develop.
Anti-virus software detects virus signatures on a computer system and notifies the user to take action.
Features of anti-virus software include secure banking, parental control, anti-phishing, VPN, anti-ransomware, support, and notifications.
Backups can be performed using full, incremental, differential, or grandfather-father-son methods, each with advantages and disadvantages.
USB flash drives, external hard drives, solid-state media, and cloud storage are all options for data storage, each with their own pros and cons.
A disaster recovery plan is necessary for companies in case of system failure, and should include a recovery time objective, a recovery point objective, and regular testing and verification.
To determine the reliability of online sources, it is important to check for facts, judgement, bias, plagiarism, recognition, correctness, and accreditation, and to use multiple trustworthy sources.
Implementation methods for digital systems include pilot, parallel, and big bang, each with their own advantages and disadvantages.
Marketing methods include email, advertising through websites, social media marketing, influencer marketing, data mining, customer segmentation, product recommendation, and pricing strategies.
Monetizing content can be achieved through affiliate links or requesting donations.
Threats to data include phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks, and prevention strategies include employing ethical hackers, identifying vulnerabilities, and implementing security measures.WJEC GCSE Digital Technology Revision Notes
The concept of digital footprints and how they are used for monitoring current and prospective employees, security, and businesses.
Notable figures in the history of computing, including Ada Lovelace, Grace Hopper, and Steve Jobs.
Examples of industrial robots used in manufacturing, such as welding, painting, assembling, palleting, packaging, and labeling.
The impact of robotics on society, culture, and the economy, including the loss of lower-skilled jobs and the creation of highly skilled new roles.
The difference between industrial and autonomous robots, with the latter having the ability to make their own decisions.
Advantages and disadvantages of autonomous cars, including fewer accidents and job losses for taxi and bus drivers.
Social, economic, legal, and ethical impacts of autonomous cars, such as who would be at fault in the event of a crash and whether they should be programmed to protect the occupants or the most lives.
The concept of virtual reality and its application in education, such as exploring historical sites and viewing scientific phenomena.
Advantages and disadvantages of virtual reality, including its immersive nature and potential distraction from the main point of a lesson.
Industries using virtual reality, such as education, military, medicine, and mental health.
Examples of how virtual reality is being used to improve certain areas, such as training for military personnel, medical simulations, and treatment for mental health disorders.
The use of augmented reality in navigation systems, sports broadcasting, and neurosurgery.

GCSE Digital Technology: Measuring and Storing Digital Data

Analogue data is continuous and used by humans, while digital data is discrete and used by computers.
Binary digits, or bits, are the smallest pieces of data that a computer can process/store.
Digital devices cannot process analogue information and all data needs to be converted into binary before a computer can use it.
Examples of analogue devices include clocks and thermometers, while examples of digital devices include smartphones and digital cameras.
Magnetic storage mediums, such as computer hard drives, use magnetizable coatings to store data, but can be less portable and more vulnerable to damage.
Optical storage mediums, such as CDs and DVDs, use lasers to read stored data and are ideally sized for storing movies and videos.
Solid-state storage, such as USBs and SSD drives, has no moving parts and offers faster data retrieval, but can be more expensive.
Cloud storage stores data remotely online and can be accessed from anywhere with a network connection.
Digital sound must be converted from analogue to digital data before it can be processed by a computer.
An analogue to digital converter (ADC) is used to convert analogue sound waves into digital data.
Digital images can be stored as bitmap or vector images, and compression techniques are used to reduce file size.
Revision activities include identifying the difference between analogue and digital data, matching facts to analogue and digital devices, and understanding storage mediums and conversion processes.Understanding Digital Sound and Images
Digital sound is produced by converting analogue sound into digital data using an analogue-to-digital converter (ADC).
Digital sound can be edited on a computer and then converted back to analogue sound using a digital-to-analogue converter (DAC).
Sampling is the process of taking regular measurements of sound waves and converting them into digital data.
The quality of digital sound is determined by two factors: the sampling rate (measured in Hz) and the bit depth (number of bits per sample).
Digital sound can be stored in uncompressed formats (such as WAV and FLAC) or compressed formats (such as MP3 and WMA).
Uncompressed formats offer higher quality but larger file sizes, while compressed formats offer smaller file sizes but lower quality.
Bitmap images are made up of pixels and are often larger in size, while vector images are made up of mathematical calculations and are smaller in size.
Image resolution refers to the number of pixels in an image, with higher resolutions offering sharper images but larger file sizes.
Image compression can be lossless (such as PNG) or lossy (such as JPEG and GIF), with the former maintaining image quality and the latter sacrificing quality for smaller file sizes.
The system life cycle for creating a new ICT system involves stages of investigation, analysis, design, implementation, maintenance, and evaluation.
Investigation involves methods such as questionnaires, interviews, and observing staff to identify user requirements and problems with the existing system.
Evaluation involves determining how well the new system meets initial requirements, identifying necessary changes, and planning for continued evolution.Digital Technology Summary
Different types of software include off-the-shelf, BPM, CRM, ERP, educational, resource management, time management, and bespoke software.
Bespoke software is customized for a specific company's needs, but it can be expensive and time-consuming to develop.
Anti-virus software detects virus signatures on a computer system and notifies the user to take action.
Features of anti-virus software include secure banking, parental control, anti-phishing, VPN, anti-ransomware, support, and notifications.
Backups can be performed using full, incremental, differential, or grandfather-father-son methods, each with advantages and disadvantages.
USB flash drives, external hard drives, solid-state media, and cloud storage are all options for data storage, each with their own pros and cons.
A disaster recovery plan is necessary for companies in case of system failure, and should include a recovery time objective, a recovery point objective, and regular testing and verification.
To determine the reliability of online sources, it is important to check for facts, judgement, bias, plagiarism, recognition, correctness, and accreditation, and to use multiple trustworthy sources.
Implementation methods for digital systems include pilot, parallel, and big bang, each with their own advantages and disadvantages.
Marketing methods include email, advertising through websites, social media marketing, influencer marketing, data mining, customer segmentation, product recommendation, and pricing strategies.
Monetizing content can be achieved through affiliate links or requesting donations.
Threats to data include phishing emails, malware, social engineering, brute force attacks, data interception, and denial of service attacks, and prevention strategies include employing ethical hackers, identifying vulnerabilities, and implementing security measures.WJEC GCSE Digital Technology Revision Notes
The concept of digital footprints and how they are used for monitoring current and prospective employees, security, and businesses.
Notable figures in the history of computing, including Ada Lovelace, Grace Hopper, and Steve Jobs.
Examples of industrial robots used in manufacturing, such as welding, painting, assembling, palleting, packaging, and labeling.
The impact of robotics on society, culture, and the economy, including the loss of lower-skilled jobs and the creation of highly skilled new roles.
The difference between industrial and autonomous robots, with the latter having the ability to make their own decisions.
Advantages and disadvantages of autonomous cars, including fewer accidents and job losses for taxi and bus drivers.
Social, economic, legal, and ethical impacts of autonomous cars, such as who would be at fault in the event of a crash and whether they should be programmed to protect the occupants or the most lives.
The concept of virtual reality and its application in education, such as exploring historical sites and viewing scientific phenomena.
Advantages and disadvantages of virtual reality, including its immersive nature and potential distraction from the main point of a lesson.
Industries using virtual reality, such as education, military, medicine, and mental health.
Examples of how virtual reality is being used to improve certain areas, such as training for military personnel, medical simulations, and treatment for mental health disorders.
The use of augmented reality in navigation systems, sports broadcasting, and neurosurgery.

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Description

Explore the basics of analogue and digital data, binary digits, storage mediums like magnetic and optical storage, and the conversion of analogue sound and images into digital formats. Learn about data retrieval, different storage options, system life cycles, and ways to ensure data security.