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Capacitor charge and dischargeEdexcel A-Level Physics: Mind map

What this mind map covers

  • Discharge
  • Time constant
  • Charging
  • Log form
  • Core practical

Exam questions on Capacitor charge and discharge

  1. A 2200 μF capacitor is charged to 9.0 V and then discharged through a 47 kΩ resistor.
    Calculate the time constant and the potential difference across the capacitor one time constant after discharge begins.2 marks
  2. A 470 μF capacitor is charged to 12 V and then discharged through a 10 kΩ resistor. The discharge starts at time t = 0.
    Calculate the current in the resistor 6.0 s after the discharge begins.2 marks
  3. A 1000 μF capacitor is charged to 6.0 V and is then discharged through a 22 kΩ resistor.
    Calculate how long it takes for the potential difference across the capacitor to fall to 2.0 V.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).