plumiTransformers: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 6.1.1.1 Transformers, 2016–2025, with mark schemes and examiner’s reports where available.
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Q38(a)
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All 24 questions on Transformers, as a list
- June 2025, Paper 1, Q38(a) (5 marks): The filament lamp connected to the secondary coil is rated at 3 V, 0.6 W. In one experiment the number of turns on the primary coil is 400 and the number of tur
- June 2025, Paper 1, Q38(b) (3 marks): Fig. 38.2 shows an enlarged top view of the top section of the laminated core. Fig. 38.2 Iron (conductor) Iron oxide (insulator) Explain how the laminations mak
- June 2025, Paper 1, Q38(c) (3 marks): In practice the transformer is not ideal and the students find that the values of the potential difference across the primary coil and the current in it are sig
- June 2024, Paper 1, Q31(a) (3 marks): Explain how an alternating current in the primary coil causes an alternating current in the secondary coil. [3]
- June 2024, Paper 1, Q31(b) (2 marks): The table shows the values of the resistor and of the potential differences in the coils. Primary Secondary Secondary potential Primary current potential Resist
- June 2023, Paper 1, Q7 (1 mark): Here are some data for an ideal transformer: number of turns on primary coil = 200 number of turns on secondary coil = 400 primary voltage = 18.0 V output power
- June 2022, Paper 1, Q29 (1 mark): Here are some data about an ideal transformer: input power: 36 W primary current: 4.8 A number of turns on primary coil: 2000 secondary voltage: 60 V What is th
- June 2022, Paper 2, Q2(a)(i) (4 marks): The core is made of sheets of iron which have been laminated (separated by thin sheets of electrically insulating material). The layers of iron and insulator ar
- November 2021, Paper 1, Q39(b) (3 marks): Explain each of the following design features of the motor: 1 The stator is made of iron. 2 The stator is laminated (made of layers of iron separated by thin la
- November 2020, Paper 1, Q25 (1 mark): The input current I to a simple transformer varies with time t as shown in the graph. I / A 0 t / s A B C D At which point in time A, B, C or D shown on the gra
- November 2020, Paper 3, Q4(a)(i) (1 mark): peak potential difference V V = V [1]
- November 2020, Paper 3, Q4(a)(ii) (1 mark): frequency f f = Hz [1]
- November 2020, Paper 3, Q4(b)(i) (2 marks): Use Fig. 4.3 to explain the student’s reasoning. [2]
- November 2020, Paper 3, Q4(b)(ii) (2 marks): The actual ratio of turns for the transformer is 5 4 . Suggest and explain a reason for this difference. [2]
- November 2020, Paper 3, Q4(c) (2 marks): The current in the primary coil is I1 and the current in the secondary coil is I2. Show that the maximum current in the secondary coil is given by the relations
- November 2020, Paper 3, Q4(d)(i) (3 marks): Estimate the maximum flux through the secondary coil. maximum flux = Wb [3] 17 The student now uses a different set of C-cores which have a greater overall leng
- November 2020, Paper 3, Q4(d)(iv) (6 marks): Explain how a small air gap affects the magnetic circuit in Fig. 4.4 and why the core is made of vertically stacked laminated sheets rather than a solid block o
- June 2019, Paper 1, Q33(a)(i) (2 marks): Calculate the voltage across the lamp on the secondary coil. voltage = V [2]
- June 2019, Paper 1, Q33(a)(ii) (2 marks): Calculate the current flowing in the primary coil. current = A [2]
- June 2019, Paper 1, Q33(b) (1 mark): Real transformers are not ideal because of energy losses. State one reason for energy losses in transformers. [1]
- June 2018, Paper 1, Q17 (1 mark): What is the current in the secondary coil? A 1.5 A B 3.0 A C 4.0 A D 6.0 A Your answer [1]
- June 2018, Paper 1, Q18 (1 mark): What is the best estimate for the rate of change of flux in the transformer core? 0.12 Wb s−1 A 0.12 T m−2 s−1 B 12 Wb s−1 C D 12 T m−2 s−1 Your answer [1]
- June 2017, Paper 1, Q23 (1 mark): Which is the best estimate of the current in the secondary coil? 1 A 4 A 1 B 2 A C 2 A D 4 A Your answer [1]
- June 2017, Paper 1, Q24 (1 mark): Which is the best estimate of the current in the primary coil? 1 A 4 A 1 B 2 A C 2 A D 4 A Your answer [1]
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