Quelpr

Electrical Quantities · CAPE Physics Unit 2

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

Practise Electrical Quantities
  1. 4(a)(i)4 marks· CAPE Physics Unit 2 · 2001 · Paper 2Define the volt, and use this definition to derive the relationship P = IV.
  2. 4(a)(ii)6 marks· CAPE Physics Unit 2 · 2001 · Paper 2An electric heater element has resistance 7.90 Ω and an applied potential difference of 115 V. Determine the current in the wire and the power used by the heater. State what happens to the power if the potential…
  3. 1(a)(i)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Define the term electromotive force.
  4. 1(a)(ii)1 mark· CAPE Physics Unit 2 · 2002 · Paper 1Define the term volt.
  5. 4(c)(ii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2Calculate the induced current in the loop.
  6. 5(a)(ii)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Distinguish between the electromotive force of a cell and the terminal potential difference across a cell.
  7. 6(b)(iii)3 marks· CAPE Physics Unit 2 · 2002 · Paper 2If electricity costs 16 cents/kWh, calculate the cost of operating the charger for 10 hours.
  8. 6(c)(i)2 marks· CAPE Physics Unit 2 · 2002 · Paper 2Calculate the r.m.s. current supplied to the consumer.
  9. 3(b)1 mark· CAPE Physics Unit 2 · 2003 · Paper 1State Ohm's Law.
  10. 3(c)2 marks· CAPE Physics Unit 2 · 2003 · Paper 1Explain the difference between electromotive force (e.m.f.) and the terminal potential difference (p.d.) of a battery.
  11. 5(a)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Explain what is meant by 'drift velocity', v.
  12. 5(a)(ii)4 marks· CAPE Physics Unit 2 · 2003 · Paper 2Show that the current, I, flowing through the conductor is given by I = n e v A, where n is the number of charge carriers, e is the charge on EACH carrier, v is the drift velocity, and A is the cross sectional area of…
  13. 5(a)(iii)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Write down an equation defining the resistivity of a piece of metal of length l and cross sectional area A.
  14. 5(b)(i)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the current flowing through the wire.
  15. 5(b)(ii)3 marks· CAPE Physics Unit 2 · 2003 · Paper 2Calculate the length of the wire.
  16. 5(c)2 marks· CAPE Physics Unit 2 · 2003 · Paper 2Given that each cubic metre of nichrome contains 9.0 x 10^28 conduction electrons, calculate the drift velocity of the electrons.
  17. 1(a)(i)1 mark· CAPE Physics Unit 2 · 2005 · Paper 1Explain what is meant by the 'drift velocity' of charge carriers.
  18. 1(a)(ii)4 marks· CAPE Physics Unit 2 · 2005 · Paper 1Figure 1 shows a current i flowing through a length of wire L with cross-sectional area A, containing n charge carriers per unit volume, with average drift velocity v_d and charge q on each carrier. Show that the drift…
  19. 1(b)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 1Calculate the number of electrons passing through the wire each second.
  20. 1(b)(ii)3 marks· CAPE Physics Unit 2 · 2005 · Paper 1Calculate the drift velocity of the charge carriers in the salt solution.
  21. 4(a)(i)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Explain clearly the difference between 'e.m.f.' and 'terminal potential difference'.
  22. 4(a)(ii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Define the 'volt' and the 'coulomb'.
  23. 6(b)(iii)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Calculate the power that must be supplied to the transformer when the secondary current is 10 mA.
  24. 6(b)(iv)2 marks· CAPE Physics Unit 2 · 2005 · Paper 2Calculate the current rating of the fuse to be used in the primary circuit.
  25. 1(a)(i)1 mark· CAPE Physics Unit 2 · 2006 · Paper 1Give the physical reason why copper is a better conductor than a material such as nichrome.
  26. 1(a)(ii)1 mark· CAPE Physics Unit 2 · 2006 · Paper 1Sketch a graph on the provided axes showing how the resistance per unit length of a wire varies with its cross-sectional area.
  27. 1(a)(iii)1 mark· CAPE Physics Unit 2 · 2006 · Paper 1Write an equation relating the resistance per unit length to the cross-sectional area of the wire.
  28. 1(b)(i)3 marks· CAPE Physics Unit 2 · 2006 · Paper 1Determine the resistance of the heater.
  29. 1(b)(ii)4 marks· CAPE Physics Unit 2 · 2006 · Paper 1The length of nichrome wire required is 42 cm. Calculate the resistivity of nichrome, stating the correct unit.
  30. 4(a)(i)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2Explain the term 'drift velocity'.
  31. 4(a)(ii)2 marks· CAPE Physics Unit 2 · 2006 · Paper 2Define the 'coulomb' and the 'volt'.
  32. 4(a)(iii)4 marks· CAPE Physics Unit 2 · 2006 · Paper 2Figure 4 shows electrons moving through a cross section of a wire. Show that the current, I, through the wire is given by I = nevA.
  33. 4(b)(ii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Calculate the number density of protons in the beam.
  34. 4(b)(iii)3 marks· CAPE Physics Unit 2 · 2006 · Paper 2Calculate the number of protons hitting the target in 1 second.
  35. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1A unit equivalent to 1\text{ volt} is
  36. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1A wire of diameter 1.0\text{ mm} is carrying a current of 1.5\text{ A}. The charge carriers are electrons and the net drift velocity of the electrons is 0.5\text{ mm s}^{-1}. The number of conduction electrons per…
  37. Q91 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1In which resistor below is the GREATEST power dissipated?
  38. Q111 mark · multiple choice· CAPE Physics Unit 2 · 2007 · Paper 1A wire, 1.00\text{ m} long and of uniform cross-sectional area 2.00\text{ mm}^2, has a resistance of 0.5\,\Omega. What is the resistivity of the wire material?
  39. 4(a)(i)2 marks· CAPE Physics Unit 2 · 2007 · Paper 2Explain why the electromotive force (e.m.f.) of a battery is not necessarily equal to the potential difference across its terminals.
  40. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1A 3\text{ V} battery causes a current of 0.5\text{ A} to flow along a wire for 4\text{ seconds}. What is the quantity of charge that passes in this time?
  41. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1Energy per unit of charge is a measure of
  42. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2007 (Specimen) · Paper 1A current of 0.25\text{ A} flows in a uniform wire of length 2\text{ metre} and cross-sectional area 2 \times 10^{-9}\text{ m}^2, when the potential difference across the wire is 4.25\text{ V}. What is the…
  43. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 1A torch bulb uses a 3\text{ V} supply and takes a current of 0.2\text{ A}. It is switched on for one minute. How much electrical energy is used?
  44. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  45. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1Given that a wire of length, L, and area, A, has resistance R, what is the resistance of a wire of similar material which is twice as long and half the diameter?
  46. Q81 mark · multiple choice· CAPE Physics Unit 2 · 2008 (T&T) · Paper 1In the equation for the current through a conductor I = nevA, v represents the
  47. 6(b)(ii)b)2 marks· CAPE Physics Unit 2 · 2008 (T&T) · Paper 2Calculate the number of electrons attached to the oil drop.
  48. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1In the equation for the current through a conductor I = n e v A, v represents the
  49. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2009 · Paper 1The correct unit for resistivity is
  50. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1In the equation for the current through a conductor I = nevA, v represents the
  51. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2010 · Paper 1The current flowing through a piece of copper wire can be increased if
  52. 4(b)2 marks· CAPE Physics Unit 2 · 2010 · Paper 2Distinguish between the 'e.m.f.' and the 'terminal p.d.' of a cell.
  53. 6(b)(i)2 marks· CAPE Physics Unit 2 · 2010 · Paper 2Calculate the electrical power input.
  54. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1In the equation for the current through a conductor I = nevA, v represents the
  55. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1The 'driving force' for charges through an electrical circuit is provided by the
  56. Q361 mark · multiple choice· CAPE Physics Unit 2 · 2011 · Paper 1The electron-volt is a measurement of
  57. 6(b)(i)4 marks· CAPE Physics Unit 2 · 2011 · Paper 2Calculate the mass of oil used per day by the power station.
  58. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  59. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2012 · Paper 1The current flowing through a piece of copper wire can be increased if
  60. 4(b)(ii)4 marks· CAPE Physics Unit 2 · 2012 · Paper 2It is claimed that during the flash, the light is as bright as that from a 200 W light bulb. Comment on this statement.
  61. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1In the equation for the current through a conductor, I = nevA, v represents the
  62. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  63. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2013 · Paper 1Given that a wire of length, L, and area, A, has resistance, R, what is the resistance of a wire of similar material which is twice as long and half the diameter?
  64. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  65. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1A light bulb uses a 3\text{V} supply and takes a current of 0.2\text{ A}. It is switched on for one minute. How much electrical energy is used?
  66. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1Given that a wire of length, L, and cross-sectional area, A, has resistance, R, what is the resistance of a wire of similar material which is twice as long and half the diameter?
  67. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2014 · Paper 1The unit for resistivity is
  68. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  69. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2015 · Paper 1Given that a wire of length, L, and area, A, has resistance, R, what is the resistance of a wire of similar material which is twice as long and half the diameter?
  70. 1(a)2 marks· CAPE Physics Unit 2 · 2015 · Paper 2Distinguish between the 'electrical resistance' and the 'electrical resistivity' of the coil of wire.
  71. 1(d)(ii)4 marks· CAPE Physics Unit 2 · 2015 · Paper 2It can be shown that the equation in Part (c) can be approximated to V_{AB} = 4 - K\rho L, where K = 1.27 \times 10^5\text{ m}^{-2}\text{V }\Omega^{-1} and \rho is the resistivity of the coil wire. Use this…
  72. 4(b)(i)2 marks· CAPE Physics Unit 2 · 2015 · Paper 2Calculate the current drawn from the source.
  73. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The electromotive force (e.m.f.) of a battery is 12\text{ V}. What is the charge passing if 36\text{ joules} of energy is delivered?
  74. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1A light bulb uses a 3\text{ V} supply and takes a current of 0.2\text{ A}. It is switched on for one minute. How much electrical energy is used?
  75. Q31 mark · multiple choice· CAPE Physics Unit 2 · 2016 · Paper 1The unit for resistivity is
  76. 4(a)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2Explain the term 'drift velocity' when applied to the movement of electrons in a conductor.
  77. 4(b)4 marks· CAPE Physics Unit 2 · 2016 · Paper 2Write the meaning of EACH variable in the equation I = nevA and state the unit in EACH case.
  78. 4(c)(i)5 marks· CAPE Physics Unit 2 · 2016 · Paper 2Calculate the drift velocity of electrons in the wire in millimetres per second.
  79. 4(c)(ii)2 marks· CAPE Physics Unit 2 · 2016 · Paper 2Suggest a reason why this value is so small compared to the other values of electron velocity commonly encountered in physics.
  80. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1When a potential difference of 2\text{ V} is applied across a resistor, 10\text{ J} of energy are converted to thermal energy. What charge flows through the resistor?
  81. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2017 · Paper 1Item 2 refers to the following diagram. [Diagram of a cylindrical conductor of length l, cross-sectional area A, with electrons moving inside] The conductor shown above has n free electrons per unit volume, each…
  82. Q11 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1The electromotive force (e.m.f.) of a battery is 12\text{ V}. What is the charge passing if 36\text{ joules} of energy is delivered?
  83. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1A light bulb uses a 3\text{ V} supply and takes a current of 0.2\text{ A}. It is switched on for one minute. How much electrical energy is used?
  84. Q171 mark · multiple choice· CAPE Physics Unit 2 · 2018 · Paper 1A household lamp is marked "120\text{ V}, 60\text{ W}". In normal use, how much energy is transformed for EACH coulomb of charge passing through the lamp?
  85. 1(e)3 marks· CAPE Physics Unit 2 · 2018 · Paper 2State THREE differences between the resistivity of this conductor and that of most metallic conductors.
  86. Q21 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1The unit for resistivity is
  87. Q41 mark · multiple choice· CAPE Physics Unit 2 · 2019 · Paper 1Given that a wire of length, L, and area, A, has resistance, R, what is the resistance of a wire of similar material which is twice the length and half the diameter?
  88. 1(a)(i)4 marks· Physics · Unit 2 Q1 1(a)(i)Explain, in terms of electron movement, how drift velocity occurs in metals.
  89. 1(a)(i)2 marks· Physics · Unit 2 Q1 1(a)(i)Define the term 'volt'.
  90. 1(a)(ii)3 marks· Physics · Unit 2 Q1 1(a)(ii)Define the term 'coulomb' and state its relationship to the elementary physical unit of charge.
  91. 1(a)(ii)5 marks· Physics · Unit 2 Q1 1(a)(ii)Consider a cylindrical piece of metal of length, d, cross-sectional area, A, and number density of charges, n. Derive the equation relating current in the metal to the drift velocity of its electrons.
  92. 1(a)(iii)4 marks· Physics · Unit 2 Q1 1(a)(iii)A DC generator supplies a current of 10 A to a load through a distribution line. The distribution line is a solid copper conductor of diameter 2.0 mm. The free electron density in copper at room temperature is 8.5 ×…
  93. 1(b)(i)4 marks· Physics · Unit 2 Q1 1(b)(i)On the grid provided in Figure 1 on page 7, plot a graph of voltage drop versus length. Draw the line of best fit through the points.
  94. 1(b)(ii)3 marks· Physics · Unit 2 Q1 1(b)(ii)Determine the gradient of your graph in (b)(i).
  95. 1(b)(iii)3 marks· Physics · Unit 2 Q1 1(b)(iii)Derive an expression for the gradient in terms of ρ, the resistivity of the wire.
  96. 1(b)(iv)2 marks· Physics · Unit 2 Q1 1(b)(iv)Hence, determine ρ, the resistivity of the unknown metal.
  97. 1(b)(v)1 mark· Physics · Unit 2 Q1 1(b)(v)Calculate the power dissipated by the wire during the experiment.
  98. 1(b)(vi)3 marks· Physics · Unit 2 Q1 1(b)(vi)Calculate the energy drawn from the power supply if the experiment runs for a total of 15 minutes.
  99. 1(b)(vii)1 mark· Physics · Unit 2 Q1 1(b)(vii)State ONE assumption made about the wire in the experiment.
  100. 2(c)(i)7 marks· Physics · Unit 2 Q2 2(c)(i)Determine the MAXIMUM drift velocity of the charge carriers in the semiconducting cylinder if the number density of electrons is 3 × 10^17 cm^-3.
  101. 2(c)(ii)2 marks· Physics · Unit 2 Q2 2(c)(ii)State how the electron drift velocity obtained in (c)(i) would compare with the electron drift velocity in a copper slug of identical dimensions carrying the same current. Explain your answer.
  102. 2(c)(iii)4 marks· Physics · Unit 2 Q2 2(c)(iii)The resistance of the semiconductor cylinder in (c) was measured and found to be 80 Ω. Calculate the resistivity of the semiconductor in ohmmeters.

Related topics in Electricity and Magnetism