
AQA A-level Physics Electronics lesson on analogue and digital signals and PCM. 22 editable slides, 29-mark worksheet, mark scheme and PDFs.
What’s in the PowerPoint
• A signals recap starter, with answers in the speaker notes
• Analogue and digital signals, bits, bytes and binary numbers 1 to 10
• Sampling and quantisation, with an original diagram
• How sampling rate and bits per sample affect quality, including aliasing
• Worked examples: CD bit rate and file size, and ADC step size
• Noise, regeneration with a Schmitt trigger, and pulse code modulation
• A practical with free audio software
• A common mistakes slide based on AQA examiner reports
• Six check questions with answers, and an exit ticket
• Teacher notes on every slide: spec references, examiner report tips, prior knowledge pages and practical ideas
What’s in the worksheet (29 marks)
• Recall of key terms and PCM
• Bit rate, file size, levels and step size calculations
• A regeneration question and a 6-mark extended answer on sampling
• A full mark scheme with mark points, on separate pages
• PDF copies of the slides, the student worksheet (no answers) and the mark scheme, ready to print
Good for: first teaching, revision, homework, cover lessons or independent study. The PowerPoint and Word files are fully editable, and the PDFs are ready to print or share with students.
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