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Electrical Circuits · CAPE Physics Unit 2

147 past-paper questions on Electrical Circuits, part of Electricity and Magnetism, from every CAPE Physics Unit 2 paper on Quelpr.

Practise Electrical Circuits
  1. 1(a)(i)2 marks· CAPE Physics Unit 2 · 2001 · Paper 2Outline TWO precautions to improve the accuracy of the results.
  2. 1(a)(ii)2 marks· CAPE Physics Unit 2 · 2001 · Paper 2Construct a suitable circuit diagram that could be used for this investigation.
  3. 1(b)(i)3 marks· CAPE Physics Unit 2 · 2001 · Paper 2Use the graph on page 5 to calculate the value of the constant A.
  4. 1(b)(ii)3 marks· CAPE Physics Unit 2 · 2001 · Paper 2Calculate the value of R_0 using a value for T of 333 K.
  5. 4(b)(i)3 marks· CAPE Physics Unit 2 · 2001 · Paper 2State Kirchhoff's laws.
  6. 4(b)(ii)7 marks· CAPE Physics Unit 2 · 2001 · Paper 2In Figure 1, a battery of e.m.f. 12.0 V and internal resistance 0.011 Ω powers a lamp of resistance 1.20 Ω, while being charged by a charger of e.m.f. 14.0 V and internal resistance 0.10 Ω. Calculate the currents I_L,…
  7. 1(b)3 marks· CAPE Physics Unit 2 · 2002 · Paper 1Draw a circuit diagram that could be used to take measurements to obtain the characteristic shown in Figure 1.
  8. 1(c)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Calculate the current flowing through the 200 Ω resistor.
  9. 1(c)(ii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 1Determine the potential difference across the thermistor.
  10. 1(c)(iii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 1Calculate the resistance of resistor R.
  11. 1(a)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Draw a circuit diagram showing how to connect the cell, ammeter, voltmeter, and variable resistor to measure the internal resistance and e.m.f. of the cell.
  12. 1(b)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2Draw the best straight line through the points plotted on Figure 1.
  13. 1(b)(ii)a)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2From the graph in Figure 1, deduce the value of the internal resistance of the cell.
  14. 1(b)(ii)b)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2From the graph in Figure 1, deduce the e.m.f. of the cell.
  15. 1(iii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2Hence, calculate the current through the circuit and the potential difference across the terminals of the cell when connected to a 3 Ω resistor.
  16. 1(iv)1 mark· CAPE Physics Unit 2 · 2002 · Paper 2State what instrument could be used instead of the voltmeter to obtain more accurate voltage readings.
  17. 5(a)(i)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2Derive an expression for the equivalent resistance of THREE resistors connected in parallel.
  18. 5(b)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2A parallel combination of rheostats R1 and R2 is used for current control (Figure 7), where the total resistance of R1 is 25 times that of R2. Describe the procedure to adjust the circuit current I to a desired value.
  19. 5(c)(i)4 marks· CAPE Physics Unit 2 · 2002 · Paper 2Calculate the resistance of the voltmeter.
  20. 5(c)(ii)5 marks· CAPE Physics Unit 2 · 2002 · Paper 2Calculate the voltmeter reading when connected across A'B' in Figure 8(ii).
  21. 5(c)(iii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2State what the results suggest concerning the use of voltmeters in electrical circuits.
  22. 3(a)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1Write an expression for the total resistance, R_T, of three resistors R_1, R_2 and R_3 in parallel.
  23. 3(d)6 marks· CAPE Physics Unit 2 · 2003 · Paper 1Fill in the blank spaces in the table with the missing data.
  24. 7(c)(iii)3 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the resistive load in the secondary circuit of the transformer.
  25. 1(a)(i)2 marks· CAPE Physics Unit 2 · 2004 · Paper 1State Kirchhoff's laws for electrical circuits.
  26. 1(a)(ii)2 marks· CAPE Physics Unit 2 · 2004 · Paper 1Explain the physical basis for EACH law in 1(a)(i).
  27. 1(b)(i)2 marks· CAPE Physics Unit 2 · 2004 · Paper 1Determine the reading when an ideal voltmeter is connected between points A and B in Figure 1.
  28. 1(b)(ii)4 marks· CAPE Physics Unit 2 · 2004 · Paper 1Determine the reading when an ideal ammeter is connected between points A and B in Figure 1.
  29. 4(b)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 1Explain how the circuit in Figure 4 could be modified so that the voltage at X is MAXIMUM when the LDR is in the dark.
  30. 4(b)(ii)6 marks· CAPE Physics Unit 2 · 2004 · Paper 1Calculate the difference in the resistance of the LDR between the dark and light conditions.
  31. 1(a)(i)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Identify the problem affecting the circuit in Figure 1a.
  32. 1(a)(ii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Redraw the circuit so that it will work.
  33. 1(a)(iii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2State which readings should be taken.
  34. 1(b)(i)a)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Determine the e.m.f., E, of the battery using the graph in Figure 1b.
  35. 1(b)(i)b)3 marks· CAPE Physics Unit 2 · 2004 · Paper 2Determine the internal resistance, r, of the battery using the graph in Figure 1b.
  36. 1(b)(ii)1 mark· CAPE Physics Unit 2 · 2004 · Paper 2Explain how the result would have been affected if the resistance of the voltmeter were comparable to that of R.
  37. 4(a)(iii)4 marks· CAPE Physics Unit 2 · 2005 · Paper 2Write down Kirchhoff's laws for electrical networks and give the physical basis for each law.
  38. 4(b)(i)8 marks· CAPE Physics Unit 2 · 2005 · Paper 2Use the circuit in Figure V to find the currents I_1, I_2 and I_3.
  39. 4(b)(ii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Find the potential difference between X and Y.
  40. 4(b)(iii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Find the terminal p.d. of Battery C.
  41. 2(a)4 marks· CAPE Physics Unit 2 · 2006 · Paper 1Complete the circuit diagram to show how a slide-wire potentiometer is connected to compare the p.d. across PQ with the switch open to the p.d. when the switch is closed.
  42. 2(b)(i)2 marks· CAPE Physics Unit 2 · 2006 · Paper 1With the switch open, the balance length is 54.2 cm. Calculate the e.m.f. of cell X.
  43. 2(b)(ii)4 marks· CAPE Physics Unit 2 · 2006 · Paper 1When the switch is closed, the balance length changes to 36.6 cm. Given that resistor R has a resistance of 5.00 Ω, calculate the internal resistance of cell X.
  44. 3(a)(iii)1 mark· CAPE Physics Unit 2 · 2006 · Paper 2To hold the drop stationary when the charge changes the p.d. must be adjusted. Draw a diagram of a circuit which could be connected to P and Q to achieve this, assuming that a power supply with a fixed output of…
  45. 6(d)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Find the potential at the non-inverting terminal of the op-amp in Figure 8.
  46. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1A circuit is set up as shown in the diagram. What happens to the readings on the ammeter and voltmeter if the resistance of the variable resistor is increased?
  47. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1Which of the following shows the I-V characteristic of a filament lamp?
  48. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1A cell of internal resistance r is connected to a load of resistance R. The efficiency of such an arrangement is found from the expression \frac{\text{energy dissipated in the load}}{\text{energy dissipated in…
  49. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1Kirchoff's Laws are derived from the laws of conservation. On which conservation laws do they depend?
  50. Q131 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1Two wires \text{X} and \text{Y}, each of the same length and material are connected in series to a battery. The diameter of \text{X} is twice that of \text{Y}. What fraction of the total potential difference is…
  51. Q211 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1The potential divider in the figure above is formed from a light dependent resistor (LDR) and a resistor (R). The LDR has a resistance of 5\,000\,\Omega in the dark and 50\,\Omega in bright light. The potential…
  52. 4(a)(ii)5 marks· CAPE Physics Unit 2 · 2007 · Paper 2Describe in detail, with the aid of a diagram, how a slide-wire potentiometer can be used to determine the e.m.f. of a battery, assuming a standard cell with e.m.f. 1.02 V is available.
  53. 4(a)(iii)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Explain why a potentiometer is expected to give a more accurate measurement of e.m.f. than a moving coil voltmeter.
  54. 4(a)(iv)3 marks· CAPE Physics Unit 2 · 2007 · Paper 2A cell has an e.m.f. of 1.51 V as measured by a potentiometer. When a 5.0 Ω resistor is connected in parallel with the cell, the terminal p.d. falls to 1.26 V. Calculate the internal resistance of the cell.
  55. 4(b)(i)6 marks· CAPE Physics Unit 2 · 2007 · Paper 2Calculate the values of currents x and y.
  56. 4(b)(ii)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Determine the potential difference between points P and Q.
  57. 6(b)(iii)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Calculate the resistance required for each of the identical protective series resistors in the display circuit.
  58. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1The variable resistor is adjusted to provide a smaller resistance. Which changes BEST describe the changes in the ammeter and voltmeter readings?
  59. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1In the diagram below, the cell has an e.m.f of 9.0\text{ V}. The reading on the high resistance voltmeter is 5.0\text{ V}. What is the current I?
  60. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1A 3\text{ V} battery of negligible internal resistance is connected to six identical resistors as shown. What is the potential difference between X and Y?
  61. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1In closed circuit or loop the algebraic sum of the e.m.f. is equal to the algebraic sum of the products of current and resistance. Which of the following statements is correct?
  62. Q211 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1The potential divider above is formed from a thermistor and a 200\ \Omega resistor. The thermistor has a resistance of 2\text{ k}\Omega at room temperature and 200\ \Omega at 100\ ^\circ\text{C}. What is the…
  63. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1The resistors in Figure 1 can be replaced by one resistor as shown in Figure 2. What is the resistance of R_T?
  64. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Which row BEST corresponds to the graphs above?
  65. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1A battery of e.m.f. 1.5\text{ V} has a terminal potential difference of 1.25\text{ V} when a resistor of 25\ \Omega is joined to it. The internal resistance of the battery is
  66. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1What is the value of Resistor X in the above Wheatstone bridge when the galvanometer reads zero?
  67. Q101 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1Which of the following equations is correct?
  68. Q261 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1When the thermistor in the potential divider is cold its resistance is 1.0\text{ k}\Omega. As its temperature rises, its resistance decreases and potential at P changes from
  69. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Which of the following graphs shows the I - V characteristic of a filament lamp?
  70. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1For the circuit diagram below, determine the current flowing through the 6\ \Omega resistor.
  71. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Item 15 refers to the following diagram. The device above represents a potential divider. The expression used to determine the output voltage is
  72. 4(a)(i)a)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Describe how values for the graph in Figure 5 could be obtained.
  73. 4(a)(i)b)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Figure 6 shows a thermistor in a water bath. Copy Figure 6 and complete it by drawing in the required circuit.
  74. 4(a)(ii)a)3 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Find the potential at point Q in the bridge circuit of Figure 7.
  75. 4(a)(ii)b)4 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2At what thermistor temperature will the galvanometer read zero?
  76. 4(b)4 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Given that current y is 2.0 A and current z is 1.0 A, calculate the e.m.f. of the battery labelled B.
  77. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1The diagram below shows a battery connected in series with a 2 ohm resistor and a switch S. A voltmeter connected across the battery reads 6\text{ V} when S is opened and 4\text{ V} when S is closed. What is…
  78. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1Four identical resistors are arranged as shown in the diagram below. What is the current ratio I_1 : I_2 : I_3?
  79. 1(a)(i)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2Sketch the I-V characteristic graph of a metallic conductor at constant temperature.
  80. 1(a)(ii)1 mark· CAPE Physics Unit 2 · 2009 · Paper 2Sketch the I-V characteristic graph of a filament bulb.
  81. 1(b)(i)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Draw a potential divider circuit suitable for investigating the I-V characteristics of the diode.
  82. 1(b)(ii)2 marks· CAPE Physics Unit 2 · 2009 · Paper 2Describe how experimental readings would be taken using the potential divider circuit.
  83. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1The above diagram is the I-V curve for a specially constructed device. In which part of the graph does the device act as an ohmic conductor?
  84. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1The potential divider shown below is designed to provide a variable output potential difference. Which combination suggests the available range of output?
  85. 4(a)4 marks· CAPE Physics Unit 2 · 2010 · Paper 2State Kirchhoff's two laws for electrical circuits and give the physical principle that each law is based on.
  86. 4(c)(i)3 marks· CAPE Physics Unit 2 · 2010 · Paper 2Calculate the current flowing through the 12 V battery.
  87. 4(c)(ii)6 marks· CAPE Physics Unit 2 · 2010 · Paper 2Points a and b are connected by a wire of negligible resistance. Calculate the new value for the current that will flow through the 12 V battery.
  88. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1Kirchhoff's second law states that the algebraic sum of the potential differences around a complete circuit must equal zero. This is a consequence of conservation of
  89. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1For the circuit diagram below, determine the current flowing through the 6\,\Omega resistor.
  90. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1The above diagram is the I-V curve for a specially constructed device. In which part of the graph does the device act as an ohmic conductor?
  91. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1What is the value of x if the galvanometer reads zero?
  92. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1What is the current in the 10\ \Omega resistor?
  93. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1For the circuit diagram below, determine the current flowing through the 6\,\Omega resistor.
  94. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1The expression used to determine the output voltage is
  95. 1(a)6 marks· CAPE Physics Unit 2 · 2013 · Paper 2With the aid of a diagram, derive the formula for the equivalent resistance of two resistors in parallel.
  96. 1(b)(i)2 marks· CAPE Physics Unit 2 · 2013 · Paper 2Calculate the equivalent resistance, R_eq, in Figure 1B.
  97. 1(b)(ii)1 mark· CAPE Physics Unit 2 · 2013 · Paper 2Determine the voltage, V2.
  98. 1(c)(i)3 marks· CAPE Physics Unit 2 · 2013 · Paper 2Use the results in Table 1 to plot a graph of I against V_T on the grid provided.
  99. 1(c)(ii)3 marks· CAPE Physics Unit 2 · 2013 · Paper 2The slope, S, of the graph is related to the internal resistance, r, by S = -1/r Ω^-1. Find S and hence determine the internal resistance, r, of the battery.
  100. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1The graph above is the I\text{-}V curve for a specially constructed device. At which part of the graph does the device act as an ohmic conductor?
  101. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Kirchhoff's second law states that the algebraic sum of the potential differences around a complete circuit must equal zero. This is a consequence of conservation of
  102. Q71 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1The current flowing through the 6\ \Omega resistor is
  103. Q221 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1The potential divider in the figure above is formed from a light dependent resistor (LDR) and a resistor (R). The LDR has a resistance of 5\ 000\ \Omega in the dark and 50\ \Omega in bright light. The potential at…
  104. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1A thermistor is used in the circuit as shown above. It is found that there is a current of 80\text{ mA} from the supply. What is the current through the thermistor?
  105. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1If all the resistors have equal resistance, R, what is the effective resistance between AB?
  106. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1If the resistances X, P, Q and R are such that no current flows through the galvanometer, the bridge is said to be balanced. Which of the following relationships BEST represents the ratio \frac{X}{R}?
  107. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1The formula used to determine the output voltage is
  108. 1(b)1 mark· CAPE Physics Unit 2 · 2015 · Paper 2Identify the circuit shown in Figure 2.
  109. 1(c)4 marks· CAPE Physics Unit 2 · 2015 · Paper 2By treating the circuit in Figure 2 as two potential dividers in parallel, show that the voltage, V_{AB}, indicated by the multimeter (MM) will be given by: V_{AB} = \left( \frac{R_2}{R_1 + R_2} - \frac{R_x}{R_x +…
  110. 1(d)(i)4 marks· CAPE Physics Unit 2 · 2015 · Paper 2On the grid provided in Figure 3, plot a graph of V_{AB} against L and draw your best straight line through the points.
  111. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The current flowing through the 6\ \Omega resistor is
  112. Q191 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The potential divider in the diagram is formed from a light dependent resistor (LDR) and a resistor (R). The LDR has a resistance of 5000\ \Omega in the dark and 50\ \Omega in bright light. The potential at A…
  113. 1(a)(i)3 marks· CAPE Physics Unit 2 · 2016 · Paper 2Explain how terminal potential difference, internal resistance and ideal source are related in a practical source of electromotive force (e.m.f.) such as an alkaline battery.
  114. 1(a)(ii)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2State TWO qualitative practical observations which demonstrate the existence of internal resistance.
  115. 1(b)(i)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2Measurements of current, I_L, are recorded as the external resistance, R_L, is varied. Show that for this circuit, the relationship between the measured current, I_L, and the external resistance, R_L, can be…
  116. 1(b)(ii)1 mark· CAPE Physics Unit 2 · 2016 · Paper 2Complete Table 1 by inserting the appropriate values in Column 3 for (I_L)^{-1} / \text{Amp}^{-1}.
  117. 1(b)(iii)4 marks· CAPE Physics Unit 2 · 2016 · Paper 2On the grid provided in Figure 2, plot a graph of I_L^{-1} versus R_L and draw the best straight line through the points. Choose appropriate scales to ensure that the origin is included.
  118. 1(b)(iv)1 mark· CAPE Physics Unit 2 · 2016 · Paper 2Determine and record the intercept on the I_L^{-1} axis.
  119. 1(b)(v)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2Use the intercept along with the equation given in (b)(i) to determine the internal resistance of the battery.
  120. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 4 refers to the following circuit diagram. [Circuit diagram showing a resistor R in series with three parallel resistors of resistance R between points A and B] If all the resistors have equal resistance, R,…
  121. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 5 refers to the following circuit diagram which compares an unknown resistance, X, with known resistances, P, Q and R. [Circuit diagram of a Wheatstone bridge with resistors X, R, P, Q and a galvanometer]…
  122. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 6 refers to the following circuit diagram in which a cell of e.m.f., E, and internal resistance, r, is connected to a resistor of resistance, R. [Circuit diagram showing a cell with internal resistance, in…
  123. 4(a)5 marks· CAPE Physics Unit 2 · 2017 · Paper 2With the aid of suitable diagrams, derive the formula for the equivalent resistance of two resistors, R₁ and R₂, connected in parallel.
  124. 4(b)(i)2 marks· CAPE Physics Unit 2 · 2017 · Paper 2State Kirchhoff's voltage law.
  125. 4(b)(ii)8 marks· CAPE Physics Unit 2 · 2017 · Paper 2By applying Kirchhoff's current law to node X and Kirchhoff's voltage law to loops L₁ and L₂, calculate the current I₂ flowing through the 20 kΩ resistor in the circuit shown in Figure 6.
  126. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Kirchhoff's second law states that the algebraic sum of the potential differences around a complete circuit must equal zero. This is a consequence of conservation of
  127. Q51 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1In the potential divider shown, the point \text{X} is to have a potential of +6.0\text{ V}. The resistance of \text{R} is
  128. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1Which of the following materials does the I\text{-}V graph BEST represent?
  129. Q201 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1The battery has negligible internal resistance. Which pair of resistance values would make the voltage between \text{X} and \text{Y} equal to 1.5\text{ V}?
  130. 1(a)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2Complete Column 3 (ln R) in Table 1.
  131. 1(b)4 marks· CAPE Physics Unit 2 · 2018 · Paper 2Using an appropriate scale, plot a graph of ln R vs T on the grid provided in Figure 1, and draw the line of best fit through the points.
  132. 1(c)4 marks· CAPE Physics Unit 2 · 2018 · Paper 2The equation relating absolute temperature and resistance is R = R₀ exp(-β T). Use this equation and your graph to find the value of β.
  133. 1(d)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2Identify the type of thermometric device used in the investigation and justify your answer.
  134. 2(e)2 marks· CAPE Physics Unit 2 · 2018 · Paper 2If the switching circuit turns on the floodlights whenever the voltage at its input falls below 7.5 volts, what should the value of R be?
  135. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 1 refers to the following circuit diagram. If all the resistors have equal resistance, R, what is the effective resistance between AB?
  136. Q61 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 6 refers to the following circuit diagram in which a cell of e.m.f., E, and internal resistance, r, is connected to a resistor of resistance, R. A voltmeter of infinite resistance is connected in parallel…
  137. Q151 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 15 refers to the following circuit diagram. A thermistor is used in the circuit as shown in the diagram above. It is found that there is a current of 80\text{ mA} from the supply. What is the current through the…
  138. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Item 17 refers to the following diagram. The potential divider in the diagram is formed from a light dependent resistor (LDR) and a resistor, R. The LDR has a resistance of 5000\ \Omega in the dark and 50\ \Omega…
  139. 1(a)(i)4 marks· Physics · Unit 2 Q1 1(a)(i)Draw a circuit diagram showing THREE resistors, R1, R2 and R3, placed in series connected to a power supply. On your diagram, label the voltages and the currents associated with EACH resistor and the power supply.
  140. 1(a)(ii)6 marks· Physics · Unit 2 Q1 1(a)(ii)Using the diagram in (a)(i), derive the formula for the effective resistance of the THREE resistors in series.
  141. 1(b)10 marks· Physics · Unit 2 Q1 1(b)Calculate the current I_L through the variable resistor R_L, when R_L has a value of 30 Ω.
  142. 1(c)(i)2 marks· Physics · Unit 2 Q1 1(c)(i)Complete Column 3 in Table 1.
  143. 1(c)(ii)4 marks· Physics · Unit 2 Q1 1(c)(ii)On the grid provided in Figure 2 on page 9, plot a graph of I_L versus [1 + (R_L / 6)]^-1. Draw the line of best fit through the points.
  144. 1(c)(iii)4 marks· Physics · Unit 2 Q1 1(c)(iii)Use the graph in (c)(ii) to determine the value of I_E.
  145. 2(b)5 marks· Physics · Unit 2 Q2 2(b)Show that the bridge is balanced when R_L = R₁R₃ / R₂.
  146. 2(d)4 marks· Physics · Unit 2 Q2 2(d)Determine the value for I, the light intensity being measured.
  147. 2(e)4 marks· Physics · Unit 2 Q2 2(e)Explain why it is desirable to make V_B (the supply to the Wheatstone bridge) as small as practicable.

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