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Topic plan · A-Level Physics 9702 · Topic 21

Alternating currents

Sinusoidal currents, root-mean-square values, and the rectification and smoothing circuits that turn a.c. into the d.c. that runs your phone.

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Unit at a glance

2 lessons, 90 minutes of teaching

Lessons
2, each planned for 45 minutes
Worksheets
2 with answer keys
Quiz questions
0 multiple-choice, assignable in the app
Lab
Alternating currents
Scheme of work

The lessons in order

RefLesson packStructureWorksheetQuizLab tab
21.1Characteristics of alternating current
Alternating current rises and falls and reverses many times a second.		Mix-Pair-Share7 Q, 65 marks (topic)4 checkstab 1
21.2Rectification and smoothing
Many devices need direct current, but the mains delivers alternating current.		Jigsaw6 Q, 51 marks (topic)4 checkstab 2

Each pack holds the plan, worksheet and quiz for its lesson. Teach the rows in order; the lab tabs match the student lessons.

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Topic resources

Topic labFull-screen simulation Revision notesOne page per lesson Notes PDFPrintable topic notes Concept mapThe topic on one sheet Student syllabus pageAlternating currents Practical trainerGraph trainer Practical trainerResults tables Practical trainerUncertainties and evaluation Practical trainerPlanning an experiment Practical trainerQuestion 1 set-up builders Practical trainerLog graphs and error bars