This lesson explains the revision approach for electricity, the second-largest section in the IGCSE Physics syllabus.
Why electricity needs structured revision
Electricity questions rely on calculations, circuit analysis and conceptual understanding of current, voltage and resistance. Rushing through the topic leaves gaps that cost marks on multi-step questions.
Step 1: Master the definitions
Write out definitions of current, voltage (potential difference), resistance, EMF and power. Use the exact wording from the syllabus. Test yourself until you can write each definition without hesitation.
Step 2: Build circuit analysis skills
Draw a simple series circuit with two resistors and a cell. Calculate total resistance, current, and the voltage across each resistor. Then do the same for a parallel circuit. Repeat until you can set up and solve both types without notes.
Step 3: Practice V-I graphs
Sketch the V-I characteristic for a fixed resistor (straight line through origin), a filament lamp (curve that flattens), and a diode (near-zero current in reverse, rapid rise in forward direction). Know what each shape tells you about resistance.
Step 4: Power and energy calculations
Practice using P = IV, P = I^2R and E = IVt. Make sure you can rearrange each one. Work through past paper questions on energy costs and appliance ratings.
Step 5: Electromagnetic effects
Revise the motor effect, generator effect and transformer. For each one, know the direction rule (left-hand rule for motors, right-hand rule for generators) and the equation if applicable.
Step 6: Past paper practice
Do at least 10 electricity questions from past papers. Mark them using the mark scheme and list your errors. Redo the ones you got wrong a week later.
Need a Plan Based on Actual Work?
A private taught trial can help distinguish whether the repeated difficulty is mainly Physics knowledge, Mathematics, practical reasoning or exam technique before regular lessons are discussed.