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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 146 · 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 10 Ω, 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  2. 2.🧮 Four equal 20 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) smaller (c) bigger (d) stay the same
  4. 4.🧮 Resistors of 100 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  5. 5.🧮 A 3 V battery is joined to 2 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  6. 6.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) always zero (d) less than either one
  7. 7.🧮 A 2.8 V battery is joined to 6 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  8. 8.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  9. 9.🧮 A 2.25 V battery is joined to 4 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  10. 10.🧮 Resistors of 150 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
  11. 11.🧮 Resistors of 47 Ω, 33 Ω, 220 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  12. 12.🧮 A 1.4 V battery is joined to 8 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  13. 13.🧮 A 20 V battery is joined to 8 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
  14. 14.🧮 Resistors of 470 Ω, 20 Ω, 20 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  15. 15.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  16. 16.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  17. 17.🧮 Resistors of 68 Ω, 10 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  18. 18.🧮 A 100 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)?
  19. 19.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  20. 20.🧮 Resistors of 33 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  21. 21.🧮 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)?
  22. 22.🧮 Resistors of 100 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  23. 23.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  24. 24.🧮 Resistors of 50 Ω, 100 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  25. 25.🧮 Four equal 400 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  26. 26.🧮 Resistors of 33 Ω, 20 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  27. 27.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  28. 28.🧮 A 1.25 V battery is joined to 3 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  29. 29.🧮 Resistors of 47 Ω, 100 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  30. 30.🧮 A 10 Ω resistor is joined in series with two equal 220 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  31. 31.🧮 Resistors of 470 Ω, 470 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.🧮 Resistors of 50 Ω, 50 Ω, 50 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  35. 35.🧮 Resistors of 330 Ω, 10 Ω, 50 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  36. 36.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  37. 37.🧮 Resistors of 33 Ω, 220 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  38. 38.🧮 Resistors of 20 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  39. 39.🧮 A 20 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  40. 40.🧮 Resistors of 20 Ω, 470 Ω, 220 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?

Answer key

  1. 250
  2. 5
  3. bigger
  4. 570
  5. 0.25
  6. less than either one
  7. 0.2
  8. 50
  9. 0.25
  10. 218
  11. 320
  12. 0.1
  13. 1
  14. 610
  15. 20
  16. 50
  17. 111
  18. 120
  19. 25
  20. 183
  21. 105
  22. 120
  23. 100
  24. 170
  25. 100
  26. 273
  27. 20
  28. 0.25
  29. 247
  30. 120
  31. 1160
  32. 197
  33. 50
  34. 5
  35. 423
  36. 20
  37. 300
  38. 53
  39. 520
  40. 760

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