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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 752 · 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.🧮 A 7 V battery is joined to 4 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  2. 2.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🧮 Resistors of 47 Ω, 47 Ω, 50 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  4. 4.🧮 Resistors of 20 Ω, 10 Ω, 33 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  5. 5.🧮 Resistors of 150 Ω, 22 Ω, 22 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  6. 6.🧮 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)?
  7. 7.🧮 A 220 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)?
  8. 8.🧮 Resistors of 330 Ω, 220 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  9. 9.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) bigger (d) smaller
  10. 10.🧮 Two resistors in parallel give a total that is … (a) their sum (b) less than either one (c) always zero (d) more than either one
  11. 11.🧮 A 330 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)?
  12. 12.🧮 Four equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  13. 13.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  14. 14.🧮 A 5 V battery is joined to 5 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  15. 15.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 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)?
  17. 17.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  18. 18.🧮 A 10 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)?
  19. 19.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  20. 20.🧮 A 0.7 V battery is joined to 2 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  21. 21.🧮 Four equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  22. 22.🧮 A 2.5 V battery is joined to 5 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  23. 23.🧮 A 1.4 V battery is joined to 12 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  24. 24.🧮 Resistors of 220 Ω, 20 Ω, 330 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧮 A 7.5 V battery is joined to 5 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  26. 26.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  27. 27.🧮 A 220 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)?
  28. 28.🧮 A 1.3 V battery is joined to 8 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  29. 29.🧮 A 6 V battery is joined to 3 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  30. 30.🧮 Five equal 125 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  31. 31.🧮 A 0.8 V battery is joined to 6 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  32. 32.🧮 A 330 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)?
  33. 33.🧮 A 1.8 V battery is joined to 3 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  34. 34.🧮 A 20 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)?
  35. 35.🧮 A 150 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)?
  36. 36.🧮 Three equal 75 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  37. 37.🧮 Resistors of 470 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  38. 38.🧮 Resistors of 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  39. 39.🧮 A 2 V battery is joined to 5 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  40. 40.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

Answer key

  1. 0.5
  2. 50
  3. 244
  4. 533
  5. 227
  6. 118
  7. 320
  8. 1020
  9. bigger
  10. less than either one
  11. 355
  12. 10
  13. 500
  14. 0.5
  15. 20
  16. 110
  17. 20
  18. 110
  19. 50
  20. 0.1
  21. 50
  22. 0.25
  23. 0.1
  24. 580
  25. 0.5
  26. 100
  27. 270
  28. 0.1
  29. 1
  30. 25
  31. 0.1
  32. 335
  33. 0.2
  34. 40
  35. 200
  36. 25
  37. 490
  38. 490
  39. 0.2
  40. 10

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