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CAIE A-Level Physics A2 19.3 Discharging a Capacitor Questions

Practise analysing capacitor-discharge graphs, calculating the time constant tau = RC and applying exponential equations to determine circuit quantities.

Syllabus
2028–2030
Course
Physics 9702
Level
A2

Exam points

  • analyse capacitor-discharge graphs for potential difference, charge and current
  • calculate and interpret τ=RC
  • apply exponential discharge equations to determine time, initial/final quantities or circuit parameters

Covered syllabus points

19.3.1—The variation with time of potential difference, charge and current19.3.2—Τ = RC for the time constant for a capacitor discharging through a resistor19.3.3—Equations of the form x = x0 e–(t / RC) where x could represent current

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