IGCSE Physics: Resistance and V = IR | Edexcel Modular | Unit 2 | L3

IGCSE Physics: Resistance and V = IR | Edexcel Modular | Unit 2 | L3

This lesson covers spec points 2.10 and 2.13 — describing the qualitative
effect of changing resistance on current in a circuit, and knowing and using
V = IR to calculate voltage, current and resistance.

PowerPoint includes:
• Retrieval starter reviewing current and charge from L2
• Direct Instruction (I Do) — voltage defined as energy transferred per unit
charge; resistance defined as opposition to current flow; V = IR introduced
with all three rearrangements; worked examples calculating voltage, current
and resistance; qualitative relationship between R and I explained at
constant voltage
• Guided Practice (We Do) — three calculations: find voltage; find current;
find resistance; predict the qualitative effect on current of increasing
resistance
• Independent Practice (You Do) — V = IR calculations in real-world contexts;
rearrangement tasks; explain and predict questions
• Review and Reflect — 3 MCQs and exit ticket

Activity Sheet includes:
• Formula box: V = IR
• 10 exam-style questions covering all three rearrangements, qualitative
resistance questions and real-world contexts
• Stretch question requiring multi-step reasoning linking resistance change
to current and voltage consequences
• Full mark scheme for teacher use