CAIE IGCSE Physics 4.2.4.1 Resistance R V I Questions
Learn to calculate resistance with R = V/I and select correct readings in series and parallel circuits, checking units before substitution.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- Calculate resistance, current or p.d. using R = V/I, use series or parallel reasoning when current splits or total resistance is needed, and interpret how current changes as resistance varies for a fixed supply.
CAIE IGCSE Physics 4.2.4.1 Resistance R V I Questions question 1
Fig. 8.2 shows another circuit. Lamps A and B are identical filament lamps.
Fig. 8.2
The current supplied by the power supply is 0.50 A .
Calculate the resistance of lamp A.
resistance =
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