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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 36 · 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 15 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🧮 Resistors of 150 Ω, 10 Ω, 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  4. 4.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) more than either one (c) their sum (d) always zero
  5. 5.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  6. 6.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  7. 7.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) zero (d) bigger
  8. 8.🧮 A 100 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)?
  9. 9.🧮 Resistors of 33 Ω, 47 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
  10. 10.🧮 Resistors of 50 Ω, 220 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  11. 11.🧮 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)?
  12. 12.🧮 Resistors of 10 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  13. 13.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  14. 14.🧮 A 7.5 V battery is joined to 12 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  15. 15.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 A 2.5 V battery is joined to 3 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  17. 17.🧮 A 3.2 V battery is joined to 12 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  18. 18.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  19. 19.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  20. 20.🧮 Resistors of 68 Ω, 33 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  21. 21.🧮 A 150 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)?
  22. 22.🧮 An 11 V battery is joined to 6 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  23. 23.🧮 Resistors of 150 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  24. 24.🧮 An 8 V battery is joined to 2 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  25. 25.🧮 Resistors of 33 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  26. 26.🧮 Resistors of 150 Ω, 47 Ω, 10 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  27. 27.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  28. 28.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  29. 29.🧮 Resistors of 22 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  30. 30.🧮 A 220 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)?
  31. 31.🧮 A 68 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)?
  32. 32.🧮 A 470 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)?
  33. 33.🧮 Resistors of 68 Ω, 10 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  34. 34.🧮 A 1.75 V battery is joined to 4 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  35. 35.🧮 A 2.8 V battery is joined to 6 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  36. 36.🧮 A 2.25 V battery is joined to 3 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  37. 37.🧮 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)?
  38. 38.🧮 Resistors of 10 Ω, 330 Ω, 50 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  39. 39.🧮 Resistors of 50 Ω, 22 Ω, 330 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  40. 40.🧮 Resistors of 150 Ω, 470 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?

Answer key

  1. 5
  2. 165
  3. 650
  4. less than either one
  5. 100
  6. 50
  7. bigger
  8. 265
  9. 148
  10. 420
  11. 110
  12. 60
  13. 20
  14. 0.5
  15. 110
  16. 0.5
  17. 0.2
  18. 100
  19. 5
  20. 134
  21. 385
  22. 1
  23. 200
  24. 1
  25. 53
  26. 537
  27. 25
  28. 10
  29. 72
  30. 385
  31. 73
  32. 480
  33. 548
  34. 0.25
  35. 0.2
  36. 0.25
  37. 35
  38. 610
  39. 412
  40. 720

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