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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 101 · 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.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points straight up (c) points up and left (d) points up and right
  2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
  4. 4.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  7. 7.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  9. 9.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  10. 10.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
  13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  17. 17.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
  18. 18.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
  19. 19.🦾 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 up and left (b) points left (c) points right (d) points straight up
  20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  23. 23.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
  24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  26. 26.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  27. 27.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
  28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points straight up (c) points up and left (d) points up and right
  30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
  34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 10
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo moves from 120° to 40°. How many degrees does it turn?

Answer key

  1. points straight up
  2. 180°
  3. a DC motor
  4. 60
  5. 150
  6. False
  7. 70
  8. a DC motor
  9. True
  10. True
  11. True
  12. 40
  13. 30
  14. a DC motor
  15. a DC motor
  16. a DC motor
  17. points right
  18. 80
  19. points left
  20. movement
  21. 50
  22. 200
  23. 50
  24. a servo motor
  25. a servo motor
  26. False
  27. 30
  28. 40
  29. points up and right
  30. a servo motor
  31. True
  32. 20
  33. 40
  34. False
  35. False
  36. 150
  37. True
  38. a DC motor
  39. False
  40. 80

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