Science crossword puzzle

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Across
  1. 2. unit used to measure power
  2. 4. unit used to measure energy
  3. 5. opposition to flow of electric current
  4. 6. flow of electric charge energy
  5. 11. circuit with multiple current paths
  6. 13. tiny particles carrying electric charge
  7. 14. flow of electric charge in circuit
  8. 15. machine that produces electrical energy
  9. 16. material electricity flows through easily
  10. 18. safety device that melts if current high
  11. 19. electrical push moving charge around circuit
Down
  1. 1. device that stores electrical energy
  2. 3. device that opens or closes circuit
  3. 7. material that resists electric current flow
  4. 8. circuit with single current path
  5. 9. changes voltage in power transmission
  6. 10. area where magnetic forces act
  7. 11. rate energy is transferred or used
  8. 12. complete path for electricity to flow
  9. 17. how much useful energy compared to input