difficult spellings 3

12345678910111213141516171819
Across
  1. 3. DC
  2. 6. AC
  3. 10. a place where books are kept and can be borrowed
  4. 11. someone who offers to help to do something without being paid
  5. 13. the rate of energy transfer
  6. 15. paper, envelopes and other items used in administration
  7. 16. an occupation undertaken for a significant period of one's life
  8. 18. describes a very small thing, for example a small model of a train
  9. 19. a book that provides information about the meaning of words
Down
  1. 1. something that makes you feel afraid is ....
  2. 2. the value in a set of data that lies at the midpoint, eg 3rd in series of 5 items arranged in order
  3. 4. when 2 straight lines go in the same direction and never meet they are ....
  4. 5. not moving
  5. 7. an assistant to a manager who takes phone calls and carries our administrative work
  6. 8. the rate of flow of electrical charges
  7. 9. the most frequently occurring value in a set of data
  8. 12. the difference in electrical charge between 2 points
  9. 14. the second month of the year
  10. 17. a combination of electronic components connected by conducting wires, where an electric current can flow
  11. 18. the "average" value calculated by adding up all the values and dividing by the number of values