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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 261 · 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.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🧮 Resistors of 22 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  4. 4.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  5. 5.🧮 Four equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  6. 6.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) more than either one (c) always zero (d) their sum
  7. 7.🧮 A 10 V battery is joined to 2 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  8. 8.🧮 Three equal 75 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  9. 9.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  10. 10.🧮 Resistors of 470 Ω, 100 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  11. 11.🧮 Resistors of 100 Ω, 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  12. 12.🧮 Five equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  13. 13.🧮 A 470 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)?
  14. 14.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  15. 15.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 A 10 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)?
  17. 17.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  18. 18.🧮 An 8 V battery is joined to 6 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  19. 19.🧮 Resistors of 220 Ω, 220 Ω, 470 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  20. 20.🧮 A 330 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)?
  21. 21.🧮 Resistors of 10 Ω, 220 Ω, 330 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  22. 22.🧮 Resistors of 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  23. 23.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) zero (d) bigger
  24. 24.🧮 Resistors of 220 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  26. 26.🧮 A 15 V battery is joined to 10 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  27. 27.🧮 Resistors of 20 Ω, 33 Ω, 330 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  28. 28.🧮 A 2.5 V battery is joined to 8 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  29. 29.🧮 A 33 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)?
  30. 30.🧮 Resistors of 150 Ω, 470 Ω, 330 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  31. 31.🧮 A 220 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)?
  32. 32.🧮 Resistors of 330 Ω, 33 Ω, 22 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 A 33 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)?
  34. 34.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  35. 35.🧮 A 10 V battery is joined to 8 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
  36. 36.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  37. 37.🧮 A 9 V battery is joined to 5 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  38. 38.🧮 Resistors of 33 Ω, 100 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  39. 39.🧮 Resistors of 22 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
  40. 40.🧮 A 2.5 V battery is joined to 3 Ω and 2 Ω resistors in series. What current flows (in amperes)? =

Answer key

  1. 20
  2. 20
  3. 72
  4. 100
  5. 25
  6. less than either one
  7. 1
  8. 25
  9. 50
  10. 617
  11. 340
  12. 20
  13. 520
  14. 5
  15. 10
  16. 60
  17. 110
  18. 1
  19. 920
  20. 495
  21. 610
  22. 240
  23. bigger
  24. 267
  25. 10
  26. 1
  27. 416
  28. 0.25
  29. 268
  30. 970
  31. 330
  32. 432
  33. 83
  34. 235
  35. 0.5
  36. 25
  37. 1
  38. 283
  39. 44
  40. 0.5

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