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Physics Support Materials Higher Electricity and Electronics

Physics Support Materials Higher Electricity and Electronics. Analogue Electronics. Click on a question number. 1, 2, 3, 9, 10, 11, 13, 14, 15, 16, 17, 18, 20. Physics Support Materials Higher Electricity and Electronics. Analogue Electronics. 1.

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Physics Support Materials Higher Electricity and Electronics

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  1. Physics Support MaterialsHigher Electricity and Electronics • Analogue Electronics Click on a question number 1, 2, 3, 9, 10, 11, 13, 14, 15, 16,17, 18, 20

  2. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 1 • Calculate the values of V1 and V2 in the circuit shown for the following situations. (a) VS = 12 V R1 = 40 k W R2 = 20 k W (b) VS = 6 V R1 = 150 k W R2 = 30 k W (c) VS = 10 V R1 = 3 k W R2 = 5 k W (a) (b) (c) Click the mouse to continue

  3. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 2 • Calculate the values of R1 in the following circuits. (a) (b) (c) Click the mouse to continue

  4. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 3 • Calculate the values of V1 and V2 in the circuits shown.(a) (b) (c) Click the mouse to continue

  5. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 9 • (a) In what mode is the op-amp being used in the circuit below. The op amp is in the inverting mode • (b) State the relationship between V1, R1, Rf, and V0. • (c) Find the unknown values in the table shown. All calculations should be set out clearly. Click the mouse to continue

  6. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 10 • (a) Which of the following values of Rf will produce saturation of the output voltage? (i) 15 kW (ii) 25 kW (iii) 35 kW • (b) What is the approximate value of the saturation voltage? Saturation voltage is approximately 85 % of the supply voltage = -10.2 V Click the mouse to continue

  7. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 11 • Calculate the value of VO for the following situations. (a) (c) (d) (b) Click the mouse to continue

  8. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 13 • (a) Calculate the value of the output voltage in the circuit shown. • (b) If the value of Rf is doubled, what would be the output voltage? The output voltage would double to 16 V – however the maximum output voltage is approximately 13 V (saturation voltage) Click the mouse to continue

  9. Voltage (V) 5 0 10 20 30 40 -5 Time (ms) Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 14 • (a) An operational amplifier can be connected in different modes. State the operating mode of the amplifier shown. The op amp is in the inverting mode • (b) Calculate the gain of the circuit. • The graph shows how the voltage applied to the input of the circuit varies with time. (c) Using square ruled paper, draw a graph showing how the output voltage varies with time. Click the mouse to continue

  10. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 14 cont • (d) Describe the output signal if the input voltage is increased to 2 V. The maximum output now exceeds the saturation voltage. The output gets clipped and becomes an approximate square wave • (e) Both resistors have an uncertainty of ± 0.01 kW . Which resistor will introduce the greatest uncertainty into the gain calculation? The biggest percentage uncertainty is in the 10 kW resistor. • (f) What is the uncertainty in the gain? The percentage uncertainty of the 10 k resistor is ten times bigger than the percentage uncertainty of the 100 k resistor. The uncertainty of the 100 k resistor can therefore be neglected. The overall uncertainty is ±0.01 Click the mouse to continue

  11. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 15 • (a) Calculate the gain of the circuit shown. • (b) Calculate the output voltage V0 for an input voltage of 15 mV. • (c) What happens to the gain of the circuit if the feedback resistor is reduced. The gain is reduced. Click the mouse to continue

  12. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 16 • The circuit below shows an operational amplifier in the differential mode. • (a) What is the function of this circuit ? It amplifies the difference between the two voltages, V1 and V2 • (b) State the relationship that applies to this circuit, giving the condition for this to hold. • (c) Find the value of VO when Rf = 10 MW, R1 = 10 kW, R2 = 10 kW R3 = 10 MW, V1 = 480 mV, V2 = 500 mV. Click the mouse to continue

  13. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 17 • Calculate the unknown values in the table for a differential amplifier circuit. (c) (a) (b) (e) (d) Click the mouse to continue

  14. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 18 • (a) In the circuit below, what value should be chosen for R for it to operate as a differential amplifier? • (b) Determine the reading on the voltmeter with the slider at position A. • (c) If the contact is moved to a position midway between A and B calculate the voltmeter reading. Click the mouse to continue

  15. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 18 (cont) • (d) Where should the contact be to produce an output voltage of (i) -1.25 V (ii) 0 V? Click the mouse to continue

  16. Physics Support MaterialsHigher Electricity and Electronics Analogue Electronics 20 • (a) Calculate the gain of the circuit shown. • (b) At what value of (i) V0 (ii) V1 will the transistor switch on? Click the mouse to continue

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