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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 671 · 40 questions
TalentJR

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

NameDateTime takenScore ___ / 40
  1. 1.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  3. 3.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  5. 5.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points right (c) points straight up (d) points up and left
  6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  7. 7.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  11. 11.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  12. 12.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
  13. 13.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
  15. 15.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  26. 26.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  27. 27.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
  28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  30. 30.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points up and left (c) points up and right (d) points right
  32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  33. 33.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
  34. 34.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
  35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points left (b) points right (c) points up and left (d) points up and right
  37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
  39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. a servo motor
  3. 70
  4. False
  5. points right
  6. False
  7. 180°
  8. 200
  9. True
  10. a servo motor
  11. True
  12. swap its two wires
  13. 80
  14. 110
  15. True
  16. 50
  17. 30
  18. 20
  19. 80
  20. 130
  21. a DC motor
  22. 150
  23. a DC motor
  24. a DC motor
  25. False
  26. movement
  27. 20
  28. True
  29. 100
  30. 120
  31. points left
  32. a DC motor
  33. 20
  34. 10
  35. a servo motor
  36. points up and left
  37. 40
  38. 170
  39. False
  40. 90

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