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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 320 · 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.🧮 Four equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Five equal 125 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) smaller (d) bigger
  4. 4.🧮 A 0.9 V battery is joined to 5 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  5. 5.🧮 A 50 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)?
  6. 6.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) always zero (c) their sum (d) more than either one
  7. 7.🧮 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)?
  8. 8.🧮 A 3.5 V battery is joined to 4 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  9. 9.🧮 A 10 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)?
  10. 10.🧮 Resistors of 150 Ω, 470 Ω, 10 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
  11. 11.🧮 A 1.4 V battery is joined to 2 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  12. 12.🧮 An 18 V battery is joined to 6 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
  13. 13.🧮 A 5.5 V battery is joined to 3 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  14. 14.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  15. 15.🧮 A 68 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)?
  16. 16.🧮 Resistors of 68 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  17. 17.🧮 A 2 V battery is joined to 2 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  18. 18.🧮 A 7.5 V battery is joined to 12 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  19. 19.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  20. 20.🧮 Resistors of 22 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  21. 21.🧮 Resistors of 33 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  22. 22.🧮 Resistors of 22 Ω, 50 Ω, 33 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  23. 23.🧮 An 8 V battery is joined to 12 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  24. 24.🧮 Resistors of 68 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧮 A 150 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)?
  26. 26.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  27. 27.🧮 A 3.25 V battery is joined to 10 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  28. 28.🧮 Resistors of 22 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  29. 29.🧮 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)?
  30. 30.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  31. 31.🧮 Resistors of 68 Ω, 68 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.🧮 Resistors of 470 Ω, 47 Ω, 220 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 Three equal 15 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.🧮 A 2.5 V battery is joined to 2 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  35. 35.🧮 A 7 V battery is joined to 2 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  36. 36.🧮 A 2.4 V battery is joined to 10 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  37. 37.🧮 A 1.5 V battery is joined to 10 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  38. 38.🧮 A 6.5 V battery is joined to 8 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  39. 39.🧮 Resistors of 330 Ω, 100 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  40. 40.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

Answer key

  1. 5
  2. 25
  3. bigger
  4. 0.1
  5. 215
  6. less than either one
  7. 268
  8. 0.5
  9. 35
  10. 698
  11. 0.2
  12. 1
  13. 0.5
  14. 100
  15. 118
  16. 118
  17. 0.5
  18. 0.5
  19. 500
  20. 122
  21. 53
  22. 155
  23. 0.5
  24. 136
  25. 315
  26. 50
  27. 0.25
  28. 242
  29. 60
  30. 20
  31. 156
  32. 759
  33. 5
  34. 0.5
  35. 1
  36. 0.2
  37. 0.1
  38. 0.5
  39. 900
  40. 20

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