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Electronics Worksheet: Series and Parallel Resistors

Electronics lesson 14: Resistors in series and parallel · Set 213 · 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.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) bigger (d) smaller
  2. 2.🧮 A 33 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)?
  3. 3.🧮 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)?
  4. 4.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) more than either one (c) always zero (d) their sum
  5. 5.🧮 Two equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  6. 6.🧮 A 33 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)?
  7. 7.🧮 A 10 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)?
  8. 8.🧮 Resistors of 50 Ω, 68 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  9. 9.🧮 A 2.4 V battery is joined to 8 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  10. 10.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  11. 11.🧮 Five equal 25 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  12. 12.🧮 Resistors of 22 Ω, 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  13. 13.🧮 Resistors of 330 Ω, 220 Ω, 20 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  15. 15.🧮 Resistors of 20 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
  16. 16.🧮 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)?
  17. 17.🧮 A 2.5 V battery is joined to 6 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  18. 18.🧮 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)?
  19. 19.🧮 A 50 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)?
  20. 20.🧮 Resistors of 20 Ω, 47 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  21. 21.🧮 A 2.25 V battery is joined to 4 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  22. 22.🧮 A 100 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)?
  23. 23.🧮 Resistors of 150 Ω, 100 Ω, 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  24. 24.🧮 A 2.8 V battery is joined to 8 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  25. 25.🧮 A 50 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)?
  26. 26.🧮 A 6.5 V battery is joined to 10 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  27. 27.🧮 Four equal 400 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  28. 28.🧮 Resistors of 10 Ω and 150 Ω are joined in series. What is the total resistance (in ohms)?
  29. 29.🧮 A 1.25 V battery is joined to 3 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  30. 30.🧮 Resistors of 68 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  31. 31.🧮 Resistors of 68 Ω, 220 Ω, 50 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.🧮 Resistors of 22 Ω, 22 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  33. 33.🧮 A 2.5 V battery is joined to 8 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  34. 34.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  35. 35.🧮 A 7 V battery is joined to 5 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  36. 36.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  37. 37.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  38. 38.🧮 Two equal 20 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 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  40. 40.🧮 A 150 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)?

Answer key

  1. bigger
  2. 43
  3. 120
  4. less than either one
  5. 25
  6. 533
  7. 175
  8. 138
  9. 0.2
  10. 235
  11. 5
  12. 512
  13. 900
  14. 500
  15. 120
  16. 233
  17. 0.25
  18. 35
  19. 55
  20. 287
  21. 0.25
  22. 125
  23. 740
  24. 0.2
  25. 285
  26. 0.5
  27. 100
  28. 160
  29. 0.25
  30. 78
  31. 668
  32. 264
  33. 0.25
  34. 20
  35. 1
  36. 100
  37. 165
  38. 10
  39. 522
  40. 170

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