Isaiah's Electricity puzzle

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Across
  1. 2. Flows in one direction
  2. 4. Material that isn't good or bad at conducting electricity
  3. 8. When a material doesn't allow easy transfer
  4. 9. A path for a current
  5. 11. Smallest positive particle
  6. 15. Possibility of doing work
  7. 16. When electrons escape the outermost ring and become able to be transferred
  8. 17. Number of protons in the nucleus balanced by a equal amount of orbiting electrons
Down
  1. 1. When there is no current
  2. 3. Smallest negative particle
  3. 5. Unit to measure potential difference
  4. 6. Opposition to the flow of current
  5. 7. When electron and protons are equal
  6. 10. When a electron can move easily between material
  7. 12. Has no resistance
  8. 13. Periodically reverses direction
  9. 14. Number of electrons in a incomplete outer shell that it can take or lose