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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 357 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
  2. 2.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  4. 4.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  6. 6.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  8. 8.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  9. 9.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
  11. 11.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
  12. 12.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  13. 13.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 10
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 30
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
  19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  21. 21.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  23. 23.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 50
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
  35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  36. 36.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
  40. 40.🦾 A servo moves from 60° to 70°. How many degrees does it turn?

Answer key

  1. a DC motor
  2. True
  3. 100
  4. True
  5. False
  6. movement
  7. a servo motor
  8. False
  9. 70
  10. 30
  11. 140
  12. True
  13. 40
  14. 50
  15. a servo motor
  16. 30
  17. 40
  18. 50
  19. a DC motor
  20. a servo motor
  21. False
  22. a servo motor
  23. 80
  24. 120
  25. a servo motor
  26. 200
  27. 250
  28. 50
  29. True
  30. False
  31. 80
  32. True
  33. 40
  34. 180°
  35. a DC motor
  36. 90
  37. 50
  38. a servo motor
  39. 110
  40. 10

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