wikiHow Calculating Impedance Practice Answers 1. 100 ohms 2. 75 ohms 3. 159.15 ohms 4. 20 ohms 5. 27.3 ohms 6. 69.28 ohms 7. 124.4 ohms 8. 75 ohms 9. 250 ohms 10. 180 ohms 11. 16.97 ohms 12. 40 ohms 13. 250 ohms 14. 145.5 ohms 15. 60 ohms 16. 62.5 ohms 17. 51.32 ohms 18. 100 ohms 19. 45 ohms 20. 178.33 ohms Page