plumiWhat is the process inside an electric generator?: OCR GCSE Physics B questions
Every OCR GCSE Physics B exam question on P3.7 What is the process inside an electric generator?, 2018–2025, with its mark scheme and examiner’s report.
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Q4(a)
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Q4(c)(i)
The whole paper ↗Q4(c)(ii)
The whole paper ↗Q7(a)
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Q7(b)
The whole paper ↗Q7(a)(i)
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Q7(a)(ii)
The whole paper ↗Q9(a)
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Q9(b)
The whole paper ↗Q9(c)
The whole paper ↗Q7(b)(i)
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Q7(b)(ii)
The whole paper ↗Q7(b)(iii)
The whole paper ↗Q6(e)(i)
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Q6(e)(ii)
The whole paper ↗Q8(a)
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Q8(b)
The whole paper ↗Q8(c)(i)
The whole paper ↗Q8(c)(ii)
The whole paper ↗Q4(a)(i)
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All 36 questions on What is the process inside an electric generator?, as a list
- June 2025, Paper 1 Foundation, Q4(a) (1 mark): What must be spinning near the coil of wire to induce a potential difference? Tick (✓) one box. A battery A current A magnet A transformer [1]
- June 2025, Paper 1 Foundation, Q4(c)(i) (1 mark): Draw a line of best fit on the graph. [1]
- June 2025, Paper 1 Foundation, Q4(c)(ii) (1 mark): Find the pedal speed for a potential difference of 5V. Use your line of best fit. Pedal speed = rpm [1]
- June 2025, Paper 3 Higher, Q7(a) (1 mark): What must the coil of wire be connected to so that a direct current is produced in the circuit? Tick (✓) one box. An ammeter A slip ring A split ring commutator
- June 2025, Paper 3 Higher, Q7(b) (1 mark): The graph shows the potential difference-time graph for the exercise bike. Potential difference (V) Time (s) Which feature of the potential difference-time grap
- June 2024, Paper 1 Foundation, Q7(a)(i) (1 mark): The diagram shows a transformer that converts potential difference from 25 000 V to 400 000 V. Primary coil Secondary coil What type of transformer is this? Tic
- June 2024, Paper 1 Foundation, Q7(a)(ii) (3 marks): The current in the 25 000 V primary coil of the transformer is 18 000 A. The secondary coil has a potential difference of 400 000 V. Calculate the current in th
- June 2024, Paper 3 Higher, Q9(a) (3 marks): Explain why a battery cannot be used in a transformer. [3]
- June 2024, Paper 3 Higher, Q9(b) (2 marks): Show how the potential differences of the primary and secondary coils relate to the number of turns on each coil. Use data from the diagram in your answer. [2]
- June 2024, Paper 3 Higher, Q9(c) (2 marks): This transformer is only 85% efficient. The engineers want to make it more efficient to make the light fitting safer for household use. Explain why transformers
- June 2024, Paper 4 Higher, Q7(b)(i) (3 marks): During an earthquake P-waves cause the magnet to move up and down inside the coil. Explain how the movement of the magnet produces an electrical signal to the d
- June 2024, Paper 4 Higher, Q7(b)(ii) (2 marks): S-waves cause the magnet to swing from side to side. During the earthquake the P-waves and S-waves have a similar amplitude of vibration. Explain why the trace
- June 2024, Paper 4 Higher, Q7(b)(iii) (1 mark): Ryan wants to make the amplitude of the trace larger when P-waves are detected. Suggest one change Ryan can make to his apparatus to increase the signal to the
- June 2023, Paper 4 Higher, Q6(e)(i) (1 mark): Describe how Sara can use the motor as a generator. [1]
- June 2023, Paper 4 Higher, Q6(e)(ii) (1 mark): Sara replaces the split ring commutator with slip rings. Describe how the output of the generator changes. [1]
- June 2022, Paper 4 Higher, Q8(a) (1 mark): Which letter in Fig. 8.2, A, B, C, or D, shows the potential difference when the coil is in the vertical position shown in Fig. 8.1? Tick (3) one box. A B C D [
- June 2022, Paper 4 Higher, Q8(b) (4 marks): Explain the change in potential difference during one complete revolution of the coil, using Fig. 8.2. Include the side of the coil labelled XY in Fig. 8.1 in y
- June 2022, Paper 4 Higher, Q8(c)(i) (2 marks): What change could be made to the generator in Fig. 8.1 to change it into a direct current (d.c) generator? [2]
- June 2022, Paper 4 Higher, Q8(c)(ii) (2 marks): Draw the potential difference output for a direct current generator rotated at the same speed, on Fig. 8.3. Potential difference (V) 4 2 Time (s) 0 – 2 – 4 Fig.
- November 2021, Paper 4 Higher, Q4(a)(i) (3 marks): Explain how the battery inside the toothbrush can charge on the charger stand. [3]
- November 2021, Paper 4 Higher, Q4(a)(ii) (3 marks): When the battery is charging the current in the primary coil is 0.25 A and the potential difference across the battery is 20 V. Calculate the current in the sec
- November 2021, Paper 4 Higher, Q4(b) (3 marks): Calculate the ratio of the number of turns in the primary coil to the number of turns in the secondary coil. Use the Data Sheet. Ratio = [3]
- November 2021, Paper 4 Higher, Q9(a) (2 marks): The bulb flashes on and off. As the coil passes through the vertical position the bulb is off. Explain why. [2]
- November 2021, Paper 4 Higher, Q9(b) (2 marks): The coil is rotated at a faster speed. Suggest two changes this will have on the bulb. 1. 2. . [2]
- November 2021, Paper 4 Higher, Q9(c) (1 mark): The slip rings shown in Fig. 9.1 are replaced by a split-ring commutator. Which graph A, B, C or D shows the potential difference that will now be generated acr
- November 2021, Paper 4 Higher, Q9(d)(ii) (4 marks): When the soundwave has a high frequency the changing current that is produced also has a high frequency. Explain how the microphone produces a current from a so
- November 2020, Paper 2 Foundation, Q13(a) (3 marks): The National Grid uses a step-up transformer to increase the potential difference from 25000 V to 400000 V before the current is sent along the transmission cab
- November 2020, Paper 4 Higher, Q2(a) (3 marks): The National Grid uses a step-up transformer to increase the potential difference from 25000 V to 400000 V before the current is sent along the transmission cab
- November 2020, Paper 4 Higher, Q11(a) (4 marks): Explain why negative current flows in Coil 2 when the switch is closed. [4]
- November 2020, Paper 4 Higher, Q11(b) (2 marks): Explain why no current flows in Coil 2, a few seconds after the switch is closed. [2]
- June 2019, Paper 4 Higher, Q8 (6 marks): 8* Electrical energy is transported across the country using the National Grid. Transformers play a key role in this transportation. Describe and explain the ro
- June 2018, Paper 3 Higher, Q7(a) (2 marks): Explain why a current is produced in the coil. [2]
- June 2018, Paper 3 Higher, Q7(b)(i) (2 marks): Complete the graph by plotting the missing results in Table 7.1 and draw a line of best fit. 12 10 8 current 6 (mA) 4 2 00 200 400 600 800 1000 1200 number of t
- June 2018, Paper 3 Higher, Q7(b)(ii) (1 mark): Use your line of best fit to determine the maximum current that Ali could produce if he used a coil with 700 turns. Maximum current = mA [1]
- June 2018, Paper 3 Higher, Q7(b)(iii) (1 mark): Amaya says that this experiment is not valid because the speed of the magnet may be different each time. Suggest how Ali could control the speed of the magnet.
- June 2018, Paper 3 Higher, Q7(c) (2 marks): As Ali pushes the magnet towards the coil, he feels a small repulsive force. Explain why. [2]
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