Edexcel P2 Unit 2.txt

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HLHSscience
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196278
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Edexcel P2 Unit 2.txt
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2013-02-02 04:14:18
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Edexcel P2 Unit2
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Edexcel P2-Unit 2
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  1. Give an example of a type of material that electrical charges can move through easily
    Metals
  2. What is electric current?
    A flow of electric charge
  3. What is the unit of electrical current?
    Ampere (Amp) (A)
  4. How is the size of a current (I) calculated from the total charge (Q) and time (t)?
    I = Q/t
  5. What is the standard unit of electrical charge?
    Coulomb (C)
  6. What is potential difference another name for ?
    Voltage
  7. What is this the symbol for?

    Switch (open)
  8. What is this the symbol for ?
    Switch (closed)
  9. What is the symbol for a fuse?
  10. What is the symbol for a cell ?
  11. What is the symbol for a battery ?
  12. What is this the symbol for ?
    Diode
  13. What is this the symbol for ?
    Variable resistor
  14. What is this the symbol for ?
    Resistor
  15. What is this the symbol for ?
    Light Dependent Resistor (LDR)
  16. What is this the symbol for ?
    Thermistor
  17. What is this the symbol for ?
    Lamp
  18. What is the symbol for a voltmeter?
  19. What is the symbol for an ammeter?
  20. What component is this graph for?
    Resistor
  21. If a component has a larger resistance, will the current be larger or smaller?
    Smaller
  22. In a series circuit, what do you know about the current at different points?
    It is always the same
  23. In a series circuit how is the total resistance calculated?
    By adding up the individual resistances
  24. For components connected in parallel what do you know about the potential difference across each component?
    They are all the same
  25. What component is this graph for?
    Filament bulb (lamp)
  26. Which component only allows current to flow one way?
    Diode
  27. What component is this graph for?
    Diode
  28. What happens to the resistance of an LDR as light intensity increases?
    The resistance decreases
  29. What happens to the resistance of a thermistor as temperature increases?
    The resistance decreases
  30. What happens when an electrical charge flows through a resistor?
    It gets hot
  31. Are ammeters connected in a circuit in series or parallel?
    Series
  32. Are voltmeters connected into a circuit in series or parallel?
    Parallel
  33. What is the difference between a normal resistor and a variable resistor?
    The resistance of a normal resistor does not change but you can manually alter the resistance of a variable resistor
  34. What is the unit of resistance and what is the symbol?
    Ohm 
  35. What affects the resistance of an LDR?
    Light intensity
  36. In a bright light, does the resistance of an LDR increase or decrease?
    Decrease
  37. What does the resistance of a thermistor depend upon?
    Temperature
  38. Does the resistance of a thermistor increase or decrease when it gets warmer?
    Decrease
  39. What unit is used to measure power?
    Watt (W)
  40. What is power?
    The rate at which energy is used. (How quickly it is used)

  41. What is the unit of energy?
    Joule (J)

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