
AQA A-level Physics Electronics lesson on the ideal op-amp and comparator. 18 editable slides, 24-mark worksheet, mark scheme and PDFs.
What’s in the PowerPoint
• A potential divider recap starter, with answers in the speaker notes
• Op-amp connections and the ideal op-amp
• Vout = AOL(V+ − V−), saturation and the transfer characteristic
• The comparator, with a worked frost alarm example
• Driving an LED from the output: sourcing and sinking current
• A practical: a light-sensing comparator
• 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 (24 marks)
• Recall of the op-amp symbol, ideal properties and saturation
• Open-loop output calculations
• A comparator circuit with an LDR and a Zener reference
• Exam-style questions on changing the switching point
• 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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