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Jun 29th, 2017
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  1. QUESTION 1
  2. b) the electrons flow from W to Z, as electrons are negatively charged, they are attracted to the positive terminal of the power supply.
  3.  
  4. c) number of free electrons per unit volume
  5.  
  6. d) (re-arrange I = nAve)
  7. = 1.56x10^30
  8.  
  9. e) ???
  10.  
  11. QUESTION 2
  12. a) i. number of free electrons per unit volume
  13.  
  14. a) ii. (see diagram middle of page 60)
  15.  
  16. b) i. (re-arrange I = nAve)
  17. = 4.14ms^-1
  18.  
  19. b) ii. due to the high drift velocity, the electrons are travelling at a higher speed. Therefore more energy is converted to heat when they collide with the fixed wire nuclei. Hence more energy is wasted.
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