plumiResistance, conductance and I-V graphs: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 3.1.2.2 Resistance, conductance and I-V graphs, 2016–2025, with mark schemes and examiner’s reports where available.
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All 50 questions on Resistance, conductance and I-V graphs, as a list
- June 2025, Paper 1, Q6 (1 mark): A number of identical resistors are connected in parallel to a cell of negligible internal resistance. Which graph shows how the power dissipated in the circuit
- June 2025, Paper 1, Q7 (1 mark): A network of resistors consists of m parallel branches. Each branch contains n identical resistors of resistance R. What is the total resistance of the network?
- June 2024, Paper 1, Q27 (1 mark): The diagram shows seven identical resistors connected in a circuit with a 6 V battery. 6 V P Q R S T Which pair of points has a potential difference of 0.5 V be
- June 2024, Paper 2, Q2(d) (3 marks): A student repeats the experiment but does not control the current. This leads to higher current values for shorter lengths of wire. Describe and explain the cha
- June 2024, Paper 3, Q2(a) (3 marks): Calculate the conductance of the semiconductor diode when the potential difference = 0.65 ± 0.02 V and the current = 7.5 ± 0.02 mA. Give the uncertainty in your
- June 2024, Paper 3, Q2(b) (3 marks): Describe how the circuit could be used to obtain values of current at different emfs in order to plot a graph of I against V. Explain the purpose of the fixed r
- June 2024, Paper 3, Q2(c) (2 marks): Sketch on the axes below the shape of the graph you would expect to obtain for both forward and reverse bias. I V 0 [2]
- June 2024, AS Paper 1, Q21(a)(ii) (1 mark): Two electrical components with different resistance are connected together so that the same current flows through them both. Complete the sentence. The two comp
- June 2024, AS Paper 1, Q26(e) (1 mark): The 22 Ω resistor is replaced with Component X and the experiment is repeated. The sketch graph below shows the p.d. across Component X against current. V 0 0 I
- June 2023, Paper 1, Q22 (1 mark): A d.c. power supply is connected to a resistor combination as shown. The ammeter reads 2.0 A. The p.d. across the 3.0 Ω resistor is 6.0 V. d.c. supply 3.0 Ω A 1
- June 2023, Paper 1, Q34(a) (1 mark): Show that the resistance of the filament when carrying 2.5 A is 1.6 Ω. [1]
- June 2023, Paper 1, Q34(c) (2 marks): Suggest and explain why the conductivity changes as the current through the filament increases. [2]
- June 2023, Paper 3, Q1(a)(i) (1 mark): Calculate the current and complete the missing rows in Table 1. [1]
- June 2023, AS Paper 1, Q16 (1 mark): Estimate the reading on the ammeter in this circuit. 6 V 100 Ω 47 Ω A 100 Ω A 20 mA B 30 mA C 40 mA D 60 mA Your answer [1]
- June 2022, Paper 1, Q5 (1 mark): A student is asked to construct a circuit to investigate the electrical characteristics of a resistor R. Which is the correct circuit? A V A V R R A B A V V A R
- June 2022, Paper 1, Q10 (1 mark): The diagram shows a network of four conductors, each with conductance 0.2 S. What is the total conductance of the arrangement? A 0.12 S B 0.27 S C 0.30 S D 0.53
- June 2022, AS Paper 1, Q6 (1 mark): Three identical resistors, each of resistance R, are connected in parallel. The resistance of the combination is: A 3R 3 B R R 3 C R D 3 Your answer [1]
- June 2022, AS Paper 1, Q21(b) (2 marks): At the start, the resistance of the thermistor is 36 kΩ. Calculate the reading on the meter. reading = mA [2]
- November 2021, Paper 1, Q8 (1 mark): The following three statements were made by students to explain the relationship between current I in an ohmic resistor and the p.d. V across it. 1 I is directl
- November 2021, Paper 1, Q27 (1 mark): The diagram shows a combination of three resistors connected to a 6.0 V power supply of negligible internal resistance. 6.0 V 300 Ω 100 Ω R A voltmeter connecte
- November 2021, AS Paper 1, Q14 (1 mark): What is the total resistance between terminals X and Y? 100 Ω 47 Ω X Y 100 Ω A 47.02 Ω B 97 Ω C 147 Ω D 247 Ω Your answer [1]
- November 2020, Paper 1, Q5 (1 mark): the highest conductance? [1] Your answer
- November 2020, Paper 1, Q6 (1 mark): a conductance of 0.15 S? [1] Your answer 5 The diagram is for use in questions 7 and 8. The diagram shows a comet in elliptical orbit around a sun. sun A D B co
- November 2020, Paper 1, Q24 (1 mark): The potential divider is set to its mid-point with Vout = 6.0 V. A 200 Ω resistance is connected across the output. Which statement about Vout is correct? A It
- November 2020, AS Paper 1, Q3 (1 mark): In the diagram below each resistor has resistance 30 Ω. X Y What is the total resistance between X and Y? A 0.1 Ω B 10 Ω C 60 Ω D 90 Ω Your answer [1]
- June 2019, Paper 1, Q1 (1 mark): The unit of electrical conductance is the siemens S, 1 S is the same as 1 J C−1 A 1 A V−1 B 1 C V−1 C 1 Ω−1 m−1 D Your answer [1]
- June 2019, Paper 1, Q31(a) (1 mark): Calculate the total resistance of the two resistors when in series. total resistance = Ω [1]
- June 2019, Paper 1, Q31(b) (1 mark): Calculate the total conductance of the two resistors when in parallel. total conductance = S [1]
- June 2019, Paper 2, Q2(c)(i) (1 mark): Using your answer to (b), calculate the current in the circuit. current = A [1]
- June 2019, AS Paper 1, Q2 (1 mark): Three identical resistors each of conductance G are connected in parallel. The conductance of the combination is A 3G 3 B G G3 C G D 3 Your answer [1]
- June 2019, AS Paper 1, Q3 (1 mark): Which sketch graph shows how the current I in an ohmic resistor varies with the p.d. V across it? I I I I V V V V A B C D Your answer [1]
- June 2019, AS Paper 1, Q15 (1 mark): Which combination of resistors gives the lowest overall resistance? 200 Ω 100 Ω 200 Ω 100 Ω 300 Ω 200 Ω 200 Ω 100 Ω A B 200 Ω 100 Ω 100 Ω 400 Ω 400 Ω 300 Ω 100
- June 2019, AS Paper 1, Q26(a) (2 marks): Explain why the voltmeter should have a very high resistance. [2] 22 The cell has an e.m.f. of 1.0 V and negligible internal resistance. The wire has a resistan
- June 2019, AS Paper 2, Q4(a) (3 marks): The two components are connected, in parallel, between the terminals of a battery of e.m.f. 3.0 V with negligible internal resistance. Calculate the conductance
- June 2019, AS Paper 2, Q4(b) (2 marks): A and B are now connected in series to a battery of e.m.f. 6.0 V with negligible internal resistance. Explain why the graph of Fig. 4 shows that the current thr
- June 2018, Paper 1, Q8 (1 mark): Which combination of resistors gives the lowest total resistance? A 200 Ω 100 Ω 300 Ω B 300 Ω 400 Ω 100 Ω C 200 Ω 300 Ω 100 Ω D 100 Ω 200 Ω 400 Ω Your answer [1
- June 2018, Paper 1, Q40(a) (3 marks): Draw a straight line of best fit on Fig. 40.2 and use it to predict the current in the coil when the motor is not rotating. Use your prediction to calculate the
- June 2018, Paper 3, Q1(a)(i) (2 marks): Show that the resistance R of the filament bulb Y in this circuit is approximately 2 Ω. [2] The bulb is broken and the diameter of the filament wire is measured
- June 2018, Paper 3, Q1(b) (6 marks): (b)* A new working identical bulb is put in the circuit in Fig. 1. The resistor X is changed to one with a resistance of 6.9 Ω. A student calculates that the vo
- June 2017, Paper 1, Q2 (1 mark): The unit of electrical resistance is the ohm Ω. 1 Ω is the same as 1 C V–1 A 1 S–1 B 1 C2 J–1 s–1 C 1 A V–1 D Your answer [1]
- June 2017, Paper 1, Q5 (1 mark): What is the resistance between X and Y? A 5 kΩ B 7.5 kΩ C 15 kΩ D 30 kΩ Your answer [1]
- June 2017, AS Paper 1, Q20 (1 mark): The resistors below are identical. Each combination is connected in a circuit to a 6 V battery of negligible internal resistance. For which combination is the m
- June 2017, AS Paper 1, Q21(b) (2 marks): Explain why I2 is twice as large as I1. �����������������������������������������������������������������������������������������������������������������������
- June 2017, AS Paper 1, Q21(c) (2 marks): Show that the total resistance of the circuit is less than 170 Ω. ���������������������������������������������������������������������������������������������
- June 2017, AS Paper 2, Q2(b) (2 marks): The conductance of the silicon section, in the direction of current, is 1.7 mS. Calculate the p.d. V2 across the silicon section. V2 = …………………………… V [2]
- June 2016, AS Paper 1, Q28(a)(i) (1 mark): State which of the two graphs relates to the diode. Explain your decision. [1]
- June 2016, AS Paper 1, Q28(a)(ii) (1 mark): Calculate the resistance of the fixed resistor. resistance = Ω [1]
- June 2016, AS Paper 1, Q28(b)(i) (1 mark): Suggest why the diode should not be connected directly across a 1.5 V supply in its conducting direction. [1]
- June 2016, AS Paper 1, Q28(b)(ii) (2 marks): The diode and resistor are connected in series across a 1.5 V supply. The diode is connected in its conducting direction. Use Fig. 28.1 to predict the current d
- June 2016, AS Paper 1, Q28(c) (4 marks): A sensitive ammeter has a full scale deflection of 100 μA and a resistance of 1000 Ω. The meter remains undamaged for voltages across it of up to 0.6 V. To prot
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