Skip to content
Try on iPad

Operational amplifier in:: AQA A‑Level Physics questions

Every AQA A-Level Physics exam question on 3.13.4 Operational amplifier in:, 2016–2025, with its mark scheme and examiner’s report.

Find questions2,714
Calculations

2,714 questions

  1. Q02.1

    June 2025 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 02.1: Explain the combined role of the 33 kΩ resistor and C in this circuit. [1 mark]

  2. Q02.2

    June 2025 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 02.2: State the function of the potential divider formed by the three 100 kΩ resistors. [1 mark]

  3. Q02.3

    June 2025 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 02.3: Deduce the voltage V+ at the non-inverting input of the operational amplifier when: • the output voltage Vout is 0.0 V • the output voltage Vout is 9.0 V. [3 ma

  4. Q03.2

    June 2025 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 03.2: Explain what is meant by a virtual earth. [1 mark]

  5. Q03.3

    June 2025 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 03.3: The output signal Vout from stage 1 is used as the input signal Vin for stage 2. Figure 9 is an incomplete circuit diagram of stage 2. Figure 9 Complete Figure

  6. Q03.4

    June 2025 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 03.4: Stage 3 uses an operational amplifier as a comparator to determine whether the irradiance detected by the photodiode in stage 1 exceeds a critical value. Figure

  7. Q03.5

    June 2025 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2025 Paper 3 Electronics, question 03.5: When the monitor is tested, the LED turns on fully. However, the LED does not turn off fully when the irradiance falls below the critical value. Suggest one rea

  8. Q04.3

    June 2024 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2024 Paper 3 Electronics, question 04.3: The particle detector produces an analogue signal that is the input voltage Vin to an amplifier circuit. Vin is amplified by a factor of +10 Draw, on Figure 12,

  9. Q02.3

    June 2023 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2023 Paper 3 Electronics, question 02.3: The voltages at X and Y in Figure 5 are now used as inputs to an operational amplifier. The operational amplifier is configured as a difference amplifier with a

  10. Q04.1

    June 2023 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2023 Paper 3 Electronics, question 04.1: A particular operational amplifier has the following properties: • open-loop gain = 1 × 105 • break frequency (cutoff frequency) = 10 Hz • gain × bandwidth = 1

  11. Q04.2

    June 2023 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2023 Paper 3 Electronics, question 04.2: Figure 9 shows the operational amplifier being used in an inverting amplifier circuit. Figure 9 Annotate Figure 9 with: • an X to indicate a point that acts as

  12. Q04.3

    June 2023 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2023 Paper 3 Electronics, question 04.3: The value of Rf in the feedback loop in Figure 9 is increased. State and explain the effect of this change on the bandwidth of the inverting amplifier. [2 marks

  13. Q01.1

    June 2022 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2022 Paper 3 Electronics, question 01.1: Draw an X on the circuit in Figure 1 to indicate a virtual earth point. [1 mark]

  14. Q01.2

    June 2022 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2022 Paper 3 Electronics, question 01.2: Show that the closed loop voltage gain for the amplifier in Figure 1 is given by: State any assumptions made in your answer. [2 marks] assumptions Rf Rin out Vi

  15. Q01.3

    June 2022 · Paper 3 Electronics

    2 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2022 Paper 3 Electronics, question 01.3: Figure 2A shows the input signal Vin that is applied to the circuit in Figure 1. Figure 2A Figure 2B The circuit in Figure 1 has a closed loop gain of −20 and h

  16. Q01.4

    June 2022 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    June 2022 Paper 3 Electronics, question 01.4: A student converts the circuit in Figure 1 into one that will add two input signals V1 and V2 . The new circuit produces an output voltage Vout so that: Vout =

  17. Q03.3

    November 2021 · Paper 3 Electronics

    3 marks3.13.1 Discrete semiconductor devices3.13.4 Operational amplifier in:
    The whole paper ↗
    November 2021 Paper 3 Electronics, question 03.3: Monochromatic radiation of wavelength 850 nm and power 4.0 µW is incident on the photodiode in Figure 10. Calculate the output voltage of the detector circuit.

  18. Q03.4

    November 2021 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    November 2021 Paper 3 Electronics, question 03.4: The output from the detector circuit in Figure 10 needs to be amplified by a factor of +4 Complete Figure 12 to show the amplifier circuit required. In your com

  19. Q04.1

    November 2020 · Paper 3 Electronics

    1 mark3.13.4 Operational amplifier in:
    The whole paper ↗
    November 2020 Paper 3 Electronics, question 04.1: What is the configuration of the operational amplifier circuit shown in Figure 6? Tick () one box. [1 mark] comparator differential amplifier inverting amplifi

  20. Q04.2

    November 2020 · Paper 3 Electronics

    3 marks3.13.4 Operational amplifier in:
    The whole paper ↗
    November 2020 Paper 3 Electronics, question 04.2: Figure 7 shows the variation of photocurrent with intensity for the monochromatic radiation incident on the photodiode. Figure 7 Radiation of intensity 3.0 W m−
All 40 questions on Operational amplifier in:, as a list
  1. June 2025, Paper 3 Electronics, Q02.1 (1 mark): Explain the combined role of the 33 kΩ resistor and C in this circuit. [1 mark]
  2. June 2025, Paper 3 Electronics, Q02.2 (1 mark): State the function of the potential divider formed by the three 100 kΩ resistors. [1 mark]
  3. June 2025, Paper 3 Electronics, Q02.3 (3 marks): Deduce the voltage V+ at the non-inverting input of the operational amplifier when: • the output voltage Vout is 0.0 V • the output voltage Vout is 9.0 V. [3 ma
  4. June 2025, Paper 3 Electronics, Q03.2 (1 mark): Explain what is meant by a virtual earth. [1 mark]
  5. June 2025, Paper 3 Electronics, Q03.3 (2 marks): The output signal Vout from stage 1 is used as the input signal Vin for stage 2. Figure 9 is an incomplete circuit diagram of stage 2. Figure 9 Complete Figure
  6. June 2025, Paper 3 Electronics, Q03.4 (3 marks): Stage 3 uses an operational amplifier as a comparator to determine whether the irradiance detected by the photodiode in stage 1 exceeds a critical value. Figure
  7. June 2025, Paper 3 Electronics, Q03.5 (1 mark): When the monitor is tested, the LED turns on fully. However, the LED does not turn off fully when the irradiance falls below the critical value. Suggest one rea
  8. June 2024, Paper 3 Electronics, Q04.3 (3 marks): The particle detector produces an analogue signal that is the input voltage Vin to an amplifier circuit. Vin is amplified by a factor of +10 Draw, on Figure 12,
  9. June 2023, Paper 3 Electronics, Q02.3 (3 marks): The voltages at X and Y in Figure 5 are now used as inputs to an operational amplifier. The operational amplifier is configured as a difference amplifier with a
  10. June 2023, Paper 3 Electronics, Q04.1 (2 marks): A particular operational amplifier has the following properties: • open-loop gain = 1 × 105 • break frequency (cutoff frequency) = 10 Hz • gain × bandwidth = 1
  11. June 2023, Paper 3 Electronics, Q04.2 (2 marks): Figure 9 shows the operational amplifier being used in an inverting amplifier circuit. Figure 9 Annotate Figure 9 with: • an X to indicate a point that acts as
  12. June 2023, Paper 3 Electronics, Q04.3 (2 marks): The value of Rf in the feedback loop in Figure 9 is increased. State and explain the effect of this change on the bandwidth of the inverting amplifier. [2 marks
  13. June 2022, Paper 3 Electronics, Q01.1 (1 mark): Draw an X on the circuit in Figure 1 to indicate a virtual earth point. [1 mark]
  14. June 2022, Paper 3 Electronics, Q01.2 (2 marks): Show that the closed loop voltage gain for the amplifier in Figure 1 is given by: State any assumptions made in your answer. [2 marks] assumptions Rf Rin out Vi
  15. June 2022, Paper 3 Electronics, Q01.3 (2 marks): Figure 2A shows the input signal Vin that is applied to the circuit in Figure 1. Figure 2A Figure 2B The circuit in Figure 1 has a closed loop gain of −20 and h
  16. June 2022, Paper 3 Electronics, Q01.4 (3 marks): A student converts the circuit in Figure 1 into one that will add two input signals V1 and V2 . The new circuit produces an output voltage Vout so that: Vout =
  17. November 2021, Paper 3 Electronics, Q03.3 (3 marks): Monochromatic radiation of wavelength 850 nm and power 4.0 µW is incident on the photodiode in Figure 10. Calculate the output voltage of the detector circuit.
  18. November 2021, Paper 3 Electronics, Q03.4 (3 marks): The output from the detector circuit in Figure 10 needs to be amplified by a factor of +4 Complete Figure 12 to show the amplifier circuit required. In your com
  19. November 2020, Paper 3 Electronics, Q04.1 (1 mark): What is the configuration of the operational amplifier circuit shown in Figure 6? Tick () one box. [1 mark] comparator differential amplifier inverting amplifi
  20. November 2020, Paper 3 Electronics, Q04.2 (3 marks): Figure 7 shows the variation of photocurrent with intensity for the monochromatic radiation incident on the photodiode. Figure 7 Radiation of intensity 3.0 W m−
  21. November 2020, Paper 3 Electronics, Q04.3 (2 marks): The intensity of radiation incident on the photodiode remains at 3.0 W m−2. Deduce whether the light-emitting diode (LED) in Figure 6 is on or off. [2 marks]
  22. June 2019, Paper 3 Electronics, Q02.1 (1 mark): What is the operational amplifier configuration shown in Figure 4? Tick () one box. [1 mark] non-inverting amplifier comparator summing amplifier difference am
  23. June 2019, Paper 3 Electronics, Q02.2 (2 marks): The circuit shown in Figure 4 is tested by making the following connections: • input A is connected to an audio signal of amplitude 150 mV • input B is connecte
  24. June 2019, Paper 3 Electronics, Q02.3 (3 marks): A microphone converts a sound wave into the voltage signal labelled signal 1 in Figure 5. At the same time the microphone produces a second signal, labelled sig
  25. June 2018, Paper 3 Electronics, Q02.1 (1 mark): An ultrasound sensor produces an output that needs to be amplified to 3.0 V The amplifier used has a voltage gain of 40 Calculate the input voltage Vin to the a
  26. June 2018, Paper 3 Electronics, Q02.2 (2 marks): An operational amplifier in non-inverting mode is used to amplify the output of the sensor. The partially completed circuit diagram is shown in Figure 3. Figure
  27. June 2018, Paper 3 Electronics, Q02.3 (2 marks): Determine, using resistors selected from the list below, how the voltage gain of 40 can be achieved by the non-inverting amplifier of Figure 3. 1 kΩ 3.6 kΩ 10 k
  28. June 2018, Paper 3 Electronics, Q02.4 (2 marks): The ultrasound frequency detected by the sensor is 50 kHz For this operational amplifier gain × bandwidth = 1.0 MHz Discuss whether this operational amplifier i
  29. June 2017, Paper 3 Electronics, Q01.1 (1 mark): Label Figure 1 with an X to show the point which is a virtual earth. [1 mark]
  30. June 2017, Paper 3 Electronics, Q01.2 (1 mark): Name the input pin shown by a (+) on the operational amplifier. [1 mark]
  31. June 2017, Paper 3 Electronics, Q01.3 (2 marks): Derive the expression for the inverting amplifier gain [2 marks] Vout V in = − Rf Rin
  32. June 2017, Paper 3 Electronics, Q01.4 (1 mark): Figure 2 shows the inverting amplifier modified to make a summing amplifier that is to form part of a two-channel audio mixer. Calculate the voltage gain produc
  33. June 2017, Paper 3 Electronics, Q01.5 (2 marks): The mixer is tested using the input signals to channels 1 and 2 with the amplitudes shown in Figure 2. Calculate the amplitude of the output voltage Vout produc
  34. June 2017, Paper 3 Electronics, Q01.6 (1 mark): Describe how the function of the audio mixer could be improved by changing the two input resistors from fixed values to variable values. [1 mark]
  35. June 2017, Paper 3 Electronics, Q04.2 (1 mark): In which mode is the operational amplifier being used in Figure 10? Tick () the correct box. [1 mark] Non-inverting amplifier Comparator Summing amplifier Diff
  36. June 2017, Paper 3 Electronics, Q04.5 (2 marks): The 10 kΩ linear potential divider shown in Figure 10 is set to give 1.75 V at point Y. Assume that the operational amplifier has ideal characteristics. Deduce
  37. Specimen, Paper 3 Electronics, Q03.1 (2 marks): Figure 2 shows a circuit that includes an ideal operational amplifier. A student uses this circuit to amplify the signal from the sensor before further processi
  38. Specimen, Paper 3 Electronics, Q03.2 (2 marks): Figure 2 shows a circuit that includes an ideal operational amplifier. A student uses this circuit to amplify the signal from the sensor before further processi
  39. Specimen, Paper 3 Electronics, Q03.3 (2 marks): Figure 2 shows a circuit that includes an ideal operational amplifier. A student uses this circuit to amplify the signal from the sensor before further processi
  40. Specimen, Paper 3 Electronics, Q03.4 (3 marks): Figure 2 shows a circuit that includes an ideal operational amplifier. A student uses this circuit to amplify the signal from the sensor before further processi

Questions, mark schemes and examiner’s reports are © AQA, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Every AQA A-Level Physics paper.

Rather write your answers by hand on iPad? Plumi marks them against the same mark schemes.