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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 853 · 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.🧮 Five equal 125 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) always zero (c) their sum (d) less than either one
  3. 3.🧮 A 100 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)?
  4. 4.🧮 Five equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  5. 5.🧮 A 47 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)?
  6. 6.🧮 A 68 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)?
  7. 7.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) smaller (c) bigger (d) stay the same
  8. 8.🧮 Resistors of 47 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  9. 9.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  10. 10.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  11. 11.🧮 Resistors of 220 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  12. 12.🧮 Resistors of 68 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  13. 13.🧮 Four equal 400 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  14. 14.🧮 A 3.25 V battery is joined to 3 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  15. 15.🧮 A 2.6 V battery is joined to 5 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  16. 16.🧮 Resistors of 33 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
  17. 17.🧮 Resistors of 20 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  18. 18.🧮 Five equal 25 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  19. 19.🧮 A 470 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)?
  20. 20.🧮 A 10 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)?
  21. 21.🧮 Resistors of 10 Ω, 50 Ω, 33 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  22. 22.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  23. 23.🧮 A 22 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)?
  24. 24.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  25. 25.🧮 A 7 V battery is joined to 4 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  26. 26.🧮 A 4.4 V battery is joined to 12 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  27. 27.🧮 A 6 V battery is joined to 4 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  28. 28.🧮 A 3.2 V battery is joined to 4 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
  29. 29.🧮 Resistors of 47 Ω, 220 Ω, 22 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  30. 30.🧮 Resistors of 33 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  31. 31.🧮 A 2.2 V battery is joined to 8 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  32. 32.🧮 Resistors of 100 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.🧮 Resistors of 470 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  35. 35.🧮 A 68 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)?
  36. 36.🧮 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)?
  37. 37.🧮 A 2.25 V battery is joined to 3 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  38. 38.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  39. 39.🧮 A 22 V battery is joined to 12 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  40. 40.🧮 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)?

Answer key

  1. 25
  2. less than either one
  3. 105
  4. 20
  5. 52
  6. 233
  7. bigger
  8. 67
  9. 10
  10. 165
  11. 230
  12. 218
  13. 100
  14. 0.25
  15. 0.2
  16. 55
  17. 30
  18. 5
  19. 570
  20. 245
  21. 140
  22. 5
  23. 72
  24. 50
  25. 1
  26. 0.2
  27. 1
  28. 0.2
  29. 389
  30. 503
  31. 0.2
  32. 250
  33. 100
  34. 490
  35. 303
  36. 480
  37. 0.25
  38. 10
  39. 1
  40. 110

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