IGCSE Physics: AC and DC Electricity | Edexcel Modular | Unit 2 | L10

IGCSE Physics: AC and DC Electricity | Edexcel Modular | Unit 2 | L10

This lesson covers spec point 2.6 — describing the difference between AC and
DC, stating the voltage and frequency of the UK mains supply, and interpreting
and sketching oscilloscope traces for both.

PowerPoint includes:
• Retrieval starter reviewing P = IV and energy from L9
• Direct Instruction (I Do) — DC defined (one direction, constant); AC defined
(periodically reverses); UK mains values stated (230 V, 50 Hz); oscilloscope
traces explained and annotated; DC trace = horizontal line; AC trace =
sinusoidal wave; frequency defined qualitatively; why AC is used for the
national grid introduced
• Guided Practice (We Do) — identify AC or DC from a trace description;
sketch the trace for a given source; state the UK mains values
• Independent Practice (You Do) — AC/DC identification; trace sketching in
books; comparison table; national grid justification
• Review and Reflect — 3 MCQs and exit ticket

Activity Sheet includes:
• Comparison table for students to complete (direction, trace, source,
frequency) for DC and AC
• 10 exam-style questions covering definitions, UK mains values, trace
interpretation, frequency and national grid application
• Stretch question: oscilloscope settings, time base effect and comparing
AC and DC traces from the same source
• Full mark scheme for teacher use