The need for compression
Lesson details
Learning outcome
I can describe why data compression is used and explain its advantages.
Key learning points
- Compression reduces file sizes, making storage and transmission more efficient.
- Compressed files load faster on websites and take less time to send or receive.
- Commonly compressed files include images, videos, audio, and documents.
Keywords
Compression - the process of reducing file size
Bandwidth - the maximum amount of data that can be transferred over a communication channel
Latency - the time delay between a signal being sent and a signal being received
Common misconception
Compression is only useful for pictures or photos.
Compression applies to many types of files such as MP3 for audio, MP4 for video, ZIP for grouped files.
Teacher tip
Ask students if they have already come across different methods of compresison such as MP3, MP4 and JPEG. Get them to take a look at their own files and see if they have been using compressed files without even realising it.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the smallest unit of digital information?
Q2.How many bits are in a byte?
Q3.What does the prefix 'kilo' represent in computing?
Q4.Put these binary numbers in sequence from smallest to largest:
Q5.Which file type is likely to take up the most storage?
Q6.What is one key advantage of storing files in the cloud?
Assessment exit quiz
6 Questions
Q1.What process reduces file sizes to make storage and transmission more efficient?
Q2.What is bandwidth?
Q3.What is the relationship between compression and bandwidth?
Q4.Why is compression important for websites?
Q5.Which of these is NOT a compressed file format?
Q6.Match each file format with the type of file it is commonly used for.
compressed audio
compressed video
compressed image
compressed group of files
To help you plan your 10 computer science lesson on: The need for compression, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 computer science lesson on: The need for compression, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 4 computer science lessons from the Data compression unit, dive into the full secondary computer science curriculum, or learn more about lesson planning.