plumiCharge, current and potential difference: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 3.1.2.1 Charge, current and potential difference, 2016–2025, with mark schemes and examiner’s reports where available.
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Q9(c)
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All 27 questions on Charge, current and potential difference, as a list
- June 2025, Paper 2, Q9(c) (3 marks): The capacitance at equilibrium position is 2.35 pF. Use this value and your value from (a) to calculate the mean current from the capacitor as the diaphragm mov
- June 2025, AS Paper 1, Q22(a) (2 marks): Complete the expression for Kirchhoff’s first law at the junction. I1 = [2]
- June 2025, AS Paper 1, Q22(b) (2 marks): Kirchhoff’s first law represents the conservation of charge at the junction. Explain why. [2]
- June 2025, AS Paper 2, Q1(b)(i) (2 marks): Show that when the current is 0.40 A the number of electrons passing through the variable resistor each second is 2.5 × 1018. [2]
- June 2025, AS Paper 2, Q1(b)(ii) (3 marks): Calculate the energy transferred by one electron as it travels from one end of the variable resistor to the other when the current is 0.40 A. Energy transferred
- June 2024, AS Paper 1, Q2 (1 mark): The circuit symbol for a fuse is: A B C D Your answer [1]
- June 2024, AS Paper 1, Q12 (1 mark): The diagram shows an example of Kirchhoff’s First Law for the currents at a junction. I2 I3 I1 I4 I1 = I2 + I3 + I4 The law describes the conservation of: A Ato
- June 2024, AS Paper 1, Q21(a)(i) (1 mark): Complete the sentence to give the definition of current. Put a ring around each correct option. charged particles free electrons Current is the flow of mobile c
- June 2024, AS Paper 1, Q21(b) (1 mark): State the energy transferred in joules when 1C of charge flows through the 20 Ω resistor. Energy = J [1]
- June 2023, AS Paper 2, Q2(c) (2 marks): In use, the LED draws an electric current of 30 mA. Calculate the number of photons emitted each second, assuming that the energy efficiency of a blue LED is 93
- June 2022, AS Paper 1, Q1 (1 mark): Which is the correct circuit symbol for an LDR? A B C D Your answer [1]
- June 2022, AS Paper 1, Q12 (1 mark): “The sum of the currents entering and leaving a junction are equal.” This statement results from the conservation of: A charge B current C energy D momentum You
- November 2021, Paper 1, Q13 (1 mark): Kirchhoff’s Second Law states that the sum of the potential differences around any closed loop in the circuit must be zero. E r R1 I1 R3 I3 R2 I2 Here are three
- November 2021, Paper 1, Q14 (1 mark): Kirchhoff’s First Law states that the sum of currents going into a junction is equal to the sum of currents coming out of that junction. Which conservation law
- November 2021, Paper 1, Q36(b)(i) (1 mark): Show that the unit A h is a unit of charge. [1]
- November 2021, Paper 1, Q36(b)(iii) (2 marks): Estimate the number of moles of lithium Li+ ions that are needed to store the amount of charge delivered by this cell. one mole = 6.0 × 1023 ions number of mole
- November 2021, AS Paper 2, Q2(a) (2 marks): Explain why the charge received by the anode in a given time must have the same magnitude as the charge received by the cathode in that time. [2]
- November 2021, AS Paper 2, Q2(b) (3 marks): Draw an arrow on each ion to show the velocity of its movement. Explain your choices of direction and size of the arrows. [3]
- November 2020, Paper 3, Q1(b)(i) (2 marks): Draw a circuit diagram to represent the apparatus used to calculate the power of the electrical heater. This symbol may be used for the electrical heater. [2]
- June 2019, Paper 1, Q40(a)(ii) (2 marks): Calculate the maximum number of electrons per second that the cell can produce. electrons per second = s−1 [2]
- June 2018, Paper 1, Q34(b) (2 marks): When fully charged, the rechargeable battery has enough charge to deliver an average current of 500 mA for an hour before it is fully discharged. Estimate the t
- June 2018, AS Paper 1, Q2 (1 mark): The sum of the currents entering a junction is equal to the sum of the currents leaving the junction. This is the principle of conservation of which quantity? A
- June 2018, AS Paper 2, Q6(b)(i) (1 mark): Show that a charge of about 4 kC flows during this discharge. [1]
- June 2017, Paper 1, Q31(b) (2 marks): The current in a main strike is 30 kA and lasts for 250 μs. Show that the charge delivered by this strike is less than 8 C. [2]
- June 2017, AS Paper 1, Q21(a) (1 mark): State the relationship between the currents IT, I1 and I2. ����������������������������������������������������������������������������������������������������
- June 2016, AS Paper 1, Q24(a) (2 marks): Explain why there is a current when the power supply is switched on. [2]
- June 2016, AS Paper 1, Q24(b) (2 marks): The charge on a carbon C+ ion is +1.6 × 10–19 C. Calculate how many carbon C+ ions arrive per second at the negative plate when the current is 28 μA. number of
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