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P2 - Flashcards - Electricity

Gelöschter Nutzer Der Nutzer hat seine Fachbereichs-Information gelöscht. Englisch 86 Karten

P2 - Flashcards - Electricity

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  1. 1What is current?Current is the flow of electrical charge.
  2. 2What is required for current to flow around a complete circuit?A source of potential difference.
  3. 3Describe the current in a series circuit?It will be the same at any point in the circuit.
  4. 4What is another name for potential difference?Voltage
  5. 5What is the unit of current?Ampere. (A)
  6. 6What is the unit of potential difference?Volt (V)
  7. 7What is resistance?Anything that slows the flow of current.
  8. 8What is the unit of resistance?Ohm (Ω)
  9. 9How does the level of resistance affect the current in a circuit?The more resistance there is across a component, the smaller the current is.
  10. 10What is charge?Charge is the size of the current.
  11. 11What is charge measured in?Coulombs (C)
  12. 12How do you calculate charge?Q = It
    Charge = Current x Time
  13. 13A battery charger passes a current of 2A through a cell for 2.5 hours. How much charge is transferred to the cell?18,000 Coulombs
    (2x(2.5x60x60))
  14. 14How could I get more charge to pass through a circuit?By increasing the amount of current.
  15. 15What is the following circuit symbol?CellWhat is the following circuit symbol?
  16. 16What is the following circuit symbol?BatteryWhat is the following circuit symbol?
  17. 17What is the following circuit symbol?Open switchWhat is the following circuit symbol?
  18. 18What is the following circuit symbol?Closed switchWhat is the following circuit symbol?
  19. 19What is the following circuit symbol?Bulb/LampWhat is the following circuit symbol?
  20. 20What is the following circuit symbol?FuseWhat is the following circuit symbol?
  21. 21What is the following circuit symbol?LED
    Light emitting Diode    What is the following circuit symbol?
  22. 22What is the following circuit symbol?ResistorWhat is the following circuit symbol?
  23. 23What is the following circuit symbol?Variable resistorWhat is the following circuit symbol?
  24. 24What is the following circuit symbol?AmmeterWhat is the following circuit symbol?
  25. 25What is the following circuit symbol?VoltmeterWhat is the following circuit symbol?
  26. 26What is the following circuit symbol?DiodeWhat is the following circuit symbol?
  27. 27What is the following circuit symbol?LDR
    Light dependant resistor    What is the following circuit symbol?
  28. 28What is the following circuit symbol?ThermistorWhat is the following circuit symbol?
  29. 29What is the formula which links potential difference and current?V = IxR
    Potential difference = Current x Resistance.
  30. 30A 4Ω resistor has a potential difference of 6V across it. What is the current flowing through the resistor?1.5A
    6 / 4 = 1.5
  31. 31Name three factors that affect resistance in a circuit.Components in series or parallel, length of wire, thickness of wire or temperature of the wire.
  32. 32What is this experiment trying to explore?How the length of a piece of wire impacts the resistance of the wire.What is this experiment trying to explore?
  33. 33What are the two components which are not labelled?Batteries and a SwitchWhat are the two components which are not labelled?
  34. 34What does this graph tell you about the resistance of a wire?The resistance is directly proportional to the length of the wire.What does this graph tell you about the resistance of a wire?
  35. 35Susie's graph doesn't pass through the origin. Suggest a reason why this might be?It could be because the first crocodile clip wasn't placed exactly on zero throwing the results off slightly.Susie's graph doesn't pass through the origin. Suggest a reason why this might be?
  36. 36What is the answer to the following question?r = v/i [1 mark]
    230/5 [1 mark]
    46Ω [1 mark]    What is the answer to the following question?
  37. 37Describe the resistance of an ohmic conductor.The resistance will not change with the current.
  38. 38Describe the relation between the current and potential difference of an ohmic conductor.Provided there is a constant temperature, the current
  39. 39Describe what happens when an electrical charge runs through a filament lamp.Some energy is transferred to the thermal energy store of the filament which heats up. As resistance is affected by temperature, the resistance increases with the temperature.
  40. 40Describe the resistance of a diode.It depends on the direction of the current. Current can easily flow in one direction but there is a large resistance in the other direction.
  41. 41Explain why diodes are used in phone chargers.Because the alternating current is unable to flow out of the phone after it enters, it means that the phone can charge.
  42. 42Draw the I-V characteristic graph for an ohmic conductor.Draw the I-V characteristic graph for an ohmic conductor.
  43. 43Draw the I-V Characteristic graph for a filament lamp.Draw the I-V Characteristic graph for a filament lamp.
  44. 44Draw the I-V characteristic graph of a diode.Draw the I-V characteristic graph of a diode.
  45. 45Explain the following I-V Characteristic graph.The current through an ohmic conductor is directly proportional to the potential difference provided that there is a constant temperature.Explain the following I-V Characteristic graph.
  46. 46Explain the following I-V characteristic graph.As the current increases, so does the temperature of the filament which increases resistance. Less current will be able to flow hence the curve.Explain the following I-V characteristic graph.
  47. 47Explain the following I-V characteristic graph.Current will only flow in one direction in a diode because in the reverse direction there is a high level of resistance.Explain the following I-V characteristic graph.
  48. 48What does LDR stand for?Light dependant resistor.
  49. 49Describe how a LDR works.It alters the resistance depending on the light level. With increased light there is decreased resistance and with decreased light there is increased resistance.
  50. 50Give 2 examples as to the applications of LDRs.Automatic Night Lights, Outdoor lighting, burglar alarms.
  51. 51Describe how a thermistor works.It alters the resistance depending on the heat level. With increased heat there is decreased resistance and with decreased heat there is increased resistance.
  52. 52Explain how, in this circuit, as the room gets warmer the fan would spin faster.As the room gets warmer, the resistance of the thermistor decreases and gets a smaller share of potential difference. Therefore the pd share the other two increases making the fan go faster.Explain how, in this circuit, as the room gets warmer the fan would spin faster.
  53. 53Describe how a series circuit would be connected.Everything would be connected in a line, one after another, between the two sides of the power supply.
  54. 54In the following circuit, what would happen if a bulb was disconnected or removed?The entire circuit would cease to function.In the following circuit, what would happen if a bulb was disconnected or removed?
  55. 55Describe the potential difference in series circuits.The potential difference of the power supply is shared between the components of a circuit.
  56. 56Describe the current in a series circuit.It is equal at any point in the circuit.
  57. 57Describe the resistance of two components in a series circuit.They will add up to the total resistance of the circuit.
  58. 58Calculate the total current passing through the circuit shown on the left.2Ω + 3Ω = 5Ω
    I = V ÷ R
    I = 20 ÷ 5
    I = 4A    Calculate the total current passing through the circuit shown on the left.
  59. 59In a circuit there are two cells each with a voltage of 1.1 volts. What is the total potential difference of the circuit?2.2 Volts
  60. 602 12 V cells are connected in series with a 3Ω resistor, a 2Ω resistor and a 7Ω resistor. Calculate the current passing through the circuit. [5 marks]2 12 V cells are connected in series with a 3Ω resistor, a 2Ω resistor and a 7Ω resistor. Calculate the current passing through the circu...
  61. 61Describe the potential difference in a parallel circuit.It is equal across all components.
  62. 62Describe the current in a parallel circuit.The current is shared amongst branches.
  63. 63What happens if you add a resistor in a parallel circuit?The overall resistance goes down.
  64. 64Explain what happens to the current and resistance in a circuit with a cell and a resistor, when another resistor is added in parallel? [2 Marks]The current through the resistor increases. [1 mark]
    The resistance decreases to less than the value of the lowest resistance. [1 mark]
  65. 65Draw a circuit diagram where 2 bulbs are connected to a battery in parallel. Both lamps should be able to switch on and off without affecting anything else. [3 marks]Draw a circuit diagram where 2 bulbs are connected to a battery in parallel. Both lamps should be able to switch on and off without affec...
  66. 66Draw a graph showing how the number of resistors connected in a circuit changes the resistance in series.Draw a graph showing how the number of resistors connected in a circuit changes the resistance in series.
  67. 67Draw a graph showing how the number of resistors connected in a circuit changes the resistance in parallel.Draw a graph showing how the number of resistors connected in a circuit changes the resistance in parallel.
  68. 68Draw a diagram of a single circuit that could be used to investigate the effect of adding resistors in parallel. Your circuit should include switches. [1 mark]Draw a diagram of a single circuit that could be used to investigate the effect of adding resistors in parallel. Your circuit should incl...
  69. 69Name the two types of electricity supply.Alternating current / AC
    Direct Current / DC
  70. 70Describe the current in the UK mains supply.It is alternating current.
    Has a p.d of 230v
    Has a frequency of 50 Hz
  71. 71Compare AC and DC current.AC constantly changes direction and is produced by alternating voltages.
    DC always flows in the same direction and is created by a direct voltage.
  72. 72Describe the structure of a three core cable.They have three wires inside of them each with a copper core and a coloured plastic coating.
  73. 73Name the three wires in a standard UK cable.Live
    Neutral
    Earth
  74. 74What colour are the three wires in a standard cable?Live - Brown
    Neutral - Blue
    Earth - Green and Yellow
  75. 75Describe the purpose of the live wire.The live wire provides the alternating p.d from the mains supply.
  76. 76Describe the purpose of the neutral wire.The neutral wire completes the circuit and carries away current.
  77. 77Describe the purpose of the earth wire.It is for protecting the wiring, and for safety. It stops the whole appliance from becoming live. It only carries current when there is a fault.
  78. 78Explain what would happen if you were to touch the live wire.Your body has a p.d of 0v. If you touch the live wire then a p.d is produced across your body and a current flows through you giving you a potentially fatal electric shock.
  79. 79What could happen if there was a connection between the live an neutral wires?It could create a low resistance path to the earth causing a huge current to flow which could result in a fire.
  80. 80State the potential difference of: The live wire, The neutral wire, The earth wire. [3 marks]230v - live
    0v - neutral
    0v - earth
    [1 mark each]
  81. 81Write the equation for energy transferred.E = Pt
    Energy transfered (j) = Power (w) x time (s)
  82. 82A 600w microwave is used for 5 minutes. How long in minutes would it take a 750w microwave to do the same amount of work?4 minutes.
    Calculate the energy transferred by the first microwave. re-arrange the equation and find out the time using the energy transferred and power.
  83. 83A circuit is made up of just a 10 Ω resistor. Explain why there is no current in the circuit. [1 mark]There is no source of potential difference.
  84. 84The diagram shows an ammeter . It has a reading of 0.5A. If another ammeter was placed at point x, what would the reading be? [1 mark]0.5AThe diagram shows an ammeter . It has a reading of 0.5A. If another ammeter was placed at point x, what would the reading be? [1 mark]
  85. 85A current of 3A flows through a 6Ω resistor. Calculate the potential difference of the circuit. [2 marks]V = IR
    V = 3x6 [1 mark]
    V = 18 [1 mark]
  86. 86—

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Der Nutzer hat seine Fachbereichs-Information gelöscht. Karteikarten am P2 - Flashcards - Electricity, erstellt von Gelöschter Nutzer am 18/06/2018.
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  • Erstellt von Ein gelöschter Nutzer · 10 Apr 2017
  • Kopiert von Robin Skailes · 18 Jun 2018
  • Kopiert von Robin Skailes · 18 Jun 2018
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