plumiExponential discharge equations: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 4.4.2.3 Exponential discharge equations, 2019–2025, with mark schemes and examiner’s reports where available.
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Q17(b)(i)
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Open the full PDFYour answerQ18(a)
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Open the full PDFQ17(b)(ii)
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Open the full PDFYour answerQ17(a)
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All 17 questions on Exponential discharge equations, as a list
- June 2025, Unit 4, Q17(b)(i) (5 marks): Deduce whether the output with the capacitor shown on the graph is consistent with a resistor tolerance of ± 5%. (5)
- January 2025, Unit 4, Q20(b)(ii) (3 marks): The student connected the switch to position Y for a time of 3 minutes. Determine, using the time constant of the circuit, the percentage of the original potent
- January 2025, Unit 4, Q20(c) (4 marks): After the capacitor was fully discharged, the student connected the switch back to position X to recharge the capacitor. The student used the voltage sensors to
- June 2024, Unit 4, Q6 (1 mark): A capacitor of capacitance C is charged to a potential difference of V0. The capacitor then discharges through a resistor of resistance R. After time t the pote
- June 2024, Unit 4, Q12(b)(i) (3 marks): The resistance of the resistor is 5.1 kΩ. Show that the capacitance of the capacitor is about 0.02 F. (3)
- October 2023, Unit 4, Q9 (1 mark): A capacitor discharges through a resistor. The time constant of the circuit is 5 s. What is the time taken, in s, for the charge on the plates of the capacitor
- June 2023, Unit 4, Q18(a) (4 marks): The value marked on the capacitor is 22 μF. Show that this value is correct. resistance of resistor = 240 kΩ (4)
- June 2023, Unit 4, Q18(b)(ii) (2 marks): Calculate the time for which the spheres were in contact. resistance in circuit = 49 Ω potential difference across capacitor before collision = 6.18 V potential
- January 2023, Unit 4, Q16(b)(i) (3 marks): Determine the resistance in the circuit when the switch was at position Y. (3) Resistance =
- October 2022, Unit 4, Q12(b) (4 marks): The capacitor in the defibrillator discharges when the switch is moved to position S2 . The defibrillator is required to deliver a discharge current of at least
- June 2022, Unit 4, Q15(a)(iii) (2 marks): Show that VC is given by the equation t VC = 5 – 5e– RC where R is the resistance of the resistor and C is the capacitance of the capacitor. (2)
- June 2022, Unit 4, Q15(b) (3 marks): The input to the integrated circuit should be 3.3 V at a time 3.5 seconds after the switch is closed. The following capacitors are available: 4.7 μF 10 μF 15 μF
- January 2022, Unit 4, Q14(c) (3 marks): Determine the capacitance of the capacitor. (3) Capacitance =
- October 2021, Unit 4, Q14(b) (2 marks): The switch is opened. Calculate the time taken for the potential difference across the capacitor to decrease to 4.0 V. Assume the resistance of the electronic c
- June 2021, Unit 4, Q17(b)(ii) (3 marks): Show that the p.d V across the capacitor when it is charging is given by V = V0 – V0e–t / RC where V0 is the e.m.f. of the battery t is the time R is the resis
- January 2021, Unit 4, Q10 (1 mark): A charged capacitor is connected across a resistor of resistance R and the current in the resistor is measured. A graph of ln (current) against time is plotted
- January 2020, Unit 4, Q17(a) (4 marks): The diagram shows the student’s design. R 12 V C The student uses a light emitting diode (LED) and a resistor R. The LED stops emitting light when the potential
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