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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 12 · 40 questions
TalentJR

Remember (Add in a row, share side by side): Series: R total = R1 + R2 + R3 … Parallel, equal resistors: R total = R ÷ number of resistors (two equal → half). Then I = V ÷ R total. Example: 6 V across 4 Ω + 8 Ω = 12 Ω → 0.5 A.

NameDateTime takenScore ___ / 40
  1. 1.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) zero (d) bigger
  3. 3.🧮 A 3.75 V battery is joined to 12 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  4. 4.🧮 A 50 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  5. 5.🧮 Resistors of 20 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  6. 6.🧮 A 220 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  7. 7.🧮 Two resistors in parallel give a total that is … (a) always zero (b) more than either one (c) less than either one (d) their sum
  8. 8.🧮 Resistors of 33 Ω, 20 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  9. 9.🧮 Resistors of 100 Ω, 68 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  10. 10.🧮 Four equal 400 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  11. 11.🧮 A 47 Ω resistor is joined in series with two equal 220 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  12. 12.🧮 Resistors of 20 Ω, 33 Ω, 10 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
  13. 13.🧮 Resistors of 22 Ω, 470 Ω, 10 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.🧮 A 50 Ω resistor is joined in series with two equal 40 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  15. 15.🧮 Four equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  17. 17.🧮 A 330 Ω resistor is joined in series with two equal 50 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  18. 18.🧮 A 20 Ω resistor is joined in series with two equal 100 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  19. 19.🧮 A 10 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  20. 20.🧮 A 2.5 V battery is joined to 2 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  21. 21.🧮 Resistors of 22 Ω, 33 Ω, 50 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  22. 22.🧮 A 220 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  23. 23.🧮 A 220 Ω resistor is joined in series with two equal 50 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  24. 24.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  25. 25.🧮 A 50 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  26. 26.🧮 Resistors of 68 Ω, 150 Ω, 33 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  27. 27.🧮 Five equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  28. 28.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  29. 29.🧮 Five equal 25 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  30. 30.🧮 Five equal 125 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  31. 31.🧮 A 4.5 V battery is joined to 5 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  32. 32.🧮 Resistors of 20 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 A 220 Ω resistor is joined in series with two equal 470 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  34. 34.🧮 Resistors of 150 Ω, 220 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  35. 35.🧮 A 1.1 V battery is joined to 8 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  36. 36.🧮 A 100 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  37. 37.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  38. 38.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  39. 39.🧮 A 47 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  40. 40.🧮 Resistors of 22 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?

Answer key

  1. 50
  2. bigger
  3. 0.25
  4. 60
  5. 40
  6. 230
  7. less than either one
  8. 103
  9. 638
  10. 100
  11. 157
  12. 85
  13. 652
  14. 70
  15. 50
  16. 50
  17. 355
  18. 70
  19. 15
  20. 0.25
  21. 325
  22. 225
  23. 245
  24. 5
  25. 550
  26. 581
  27. 10
  28. 100
  29. 5
  30. 25
  31. 0.5
  32. 120
  33. 455
  34. 417
  35. 0.1
  36. 110
  37. 165
  38. 10
  39. 212
  40. 242

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