Calculations, calculations, calculations!

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Across
  1. 3. Image size / Magnification
  2. 4. Units for potential difference
  3. 7. Units for charge
  4. 9. Force / Area
  5. 11. Units for force
  6. 12. Distance / Time
  7. 13. Potential difference / Current
  8. 15. Image size / Actual size
  9. 17. Number of moles X 24
  10. 18. Units for energy
  11. 19. 1/2 X Mass X Velocity2
  12. 23. Energy / Time
  13. 24. Mass - Protons
  14. 25. Mass X Acceleration
Down
  1. 1. Mass / Volume
  2. 2. Displacement / Time
  3. 3. Change in speed / Time
  4. 5. Units for current
  5. 6. Mass X 10
  6. 8. Force / Extension
  7. 10. Useful output / Total input X 100
  8. 14. Force X Distance
  9. 15. Mass / Formula mass
  10. 16. Units for frequency
  11. 20. Number of moles / Volume
  12. 21. Wave speed / Wavelength
  13. 22. Current X Time