L6th Xmas crossword

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Across
  1. 3. what second?
  2. 5. voltmeter connection
  3. 6. channel with lots of energy
  4. 9. they are going an unconventional way
  5. 10. at this point you probably won't have heard of the this Pearl Jam album.
  6. 12. it might get cold but never that cold
  7. 14. symbol confused with resistivity
  8. 16. how Galileo mesured time
  9. 18. when R is zero
  10. 19. why you can hear through a doorway
  11. 21. 4 not 6
  12. 22. universe speed limit
  13. 23. per unit time
Down
  1. 1. double the diameter, halve the length and the resistance…..
  2. 2. sans direction
  3. 4. thoeretical resistance of a voltmeter
  4. 5. property of reflected light
  5. 7. can be found by displacement
  6. 8. waved goodbye to that
  7. 11. billionth
  8. 13. conservation of charge is the first law
  9. 15. JperC
  10. 17. millionth
  11. 19. J is, N is, A isnt & K isnt
  12. 20. the route light takes