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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 456 · 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.

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  1. 1.🧮 Resistors of 20 Ω, 68 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  2. 2.🧮 A 7 V battery is joined to 10 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  3. 3.🧮 Resistors of 33 Ω, 68 Ω, 330 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  4. 4.🧮 Adding another resistor in series makes the total resistance … (a) bigger (b) zero (c) smaller (d) stay the same
  5. 5.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  6. 6.🧮 Five equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  7. 7.🧮 Resistors of 47 Ω, 220 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  8. 8.🧮 Two resistors in parallel give a total that is … (a) their sum (b) less than either one (c) more than either one (d) always zero
  9. 9.🧮 A 470 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)?
  10. 10.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  11. 11.🧮 Resistors of 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  12. 12.🧮 Resistors of 150 Ω, 330 Ω, 20 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  13. 13.🧮 Resistors of 33 Ω, 22 Ω, 33 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  15. 15.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 A 2.75 V battery is joined to 6 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  17. 17.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  18. 18.🧮 A 3.2 V battery is joined to 8 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  19. 19.🧮 Resistors of 20 Ω, 330 Ω, 100 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  20. 20.🧮 A 1.5 V battery is joined to 5 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  21. 21.🧮 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)?
  22. 22.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  23. 23.🧮 A 47 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)?
  24. 24.🧮 Resistors of 22 Ω, 470 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧮 Resistors of 470 Ω, 10 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  26. 26.🧮 A 9 V battery is joined to 10 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  27. 27.🧮 Five equal 25 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  28. 28.🧮 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)?
  29. 29.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  30. 30.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  31. 31.🧮 A 2.8 V battery is joined to 8 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  32. 32.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  33. 33.🧮 A 2.2 V battery is joined to 12 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  34. 34.🧮 A 1.4 V battery is joined to 10 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  35. 35.🧮 A 33 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)?
  36. 36.🧮 Resistors of 68 Ω, 220 Ω, 33 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
  37. 37.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  38. 38.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  39. 39.🧮 A 22 Ω resistor is joined in series with two equal 200 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  40. 40.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

Answer key

  1. 138
  2. 0.5
  3. 531
  4. bigger
  5. 100
  6. 20
  7. 597
  8. less than either one
  9. 635
  10. 25
  11. 490
  12. 650
  13. 138
  14. 10
  15. 5
  16. 0.25
  17. 100
  18. 0.2
  19. 500
  20. 0.1
  21. 60
  22. 50
  23. 67
  24. 512
  25. 530
  26. 0.5
  27. 5
  28. 225
  29. 20
  30. 20
  31. 0.2
  32. 165
  33. 0.1
  34. 0.1
  35. 53
  36. 343
  37. 20
  38. 50
  39. 122
  40. 235

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