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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 45 · 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 spins round and round? (a) a DC motor (b) a servo motor
  2. 2.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  4. 4.🦾 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 right (c) points up and left (d) points straight up
  5. 5.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
  6. 6.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 50
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
  8. 8.🦾 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 up and right (c) points left (d) points up and left
  9. 9.🦾 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 up and left (b) points left (c) points up and right (d) points right
  10. 10.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  14. 14.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  16. 16.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
  17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
  24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  25. 25.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  29. 29.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  31. 31.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  33. 33.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
  37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. 40
  3. False
  4. points left
  5. 40
  6. 70
  7. 120
  8. points right
  9. points up and right
  10. 20
  11. False
  12. 50
  13. False
  14. True
  15. True
  16. 10
  17. a servo motor
  18. 10
  19. a DC motor
  20. movement
  21. a servo motor
  22. 180°
  23. a DC motor
  24. a servo motor
  25. True
  26. a servo motor
  27. a DC motor
  28. 100
  29. False
  30. 200
  31. 120
  32. 150
  33. True
  34. False
  35. a servo motor
  36. 50
  37. a DC motor
  38. a DC motor
  39. 50
  40. 140

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