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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 490 · 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 common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  3. 3.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
  4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
  6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
  8. 8.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  9. 9.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 60
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  11. 11.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  13. 13.🦾 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 up and right (c) points straight up (d) points left
  14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  16. 16.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  17. 17.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
  20. 20.🦾 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 right (b) points up and left (c) points left (d) points straight up
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
  27. 27.🦾 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 straight up (d) points left
  28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 60
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
  34. 34.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  37. 37.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
  38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

Answer key

  1. 180°
  2. a servo motor
  3. 60
  4. a servo motor
  5. 40
  6. a servo motor
  7. a servo motor
  8. True
  9. 30
  10. a DC motor
  11. movement
  12. a DC motor
  13. points left
  14. True
  15. 120
  16. False
  17. True
  18. a servo motor
  19. a DC motor
  20. points up and left
  21. 100
  22. True
  23. a DC motor
  24. a servo motor
  25. a DC motor
  26. 100
  27. points right
  28. a DC motor
  29. 250
  30. 20
  31. False
  32. 130
  33. 80
  34. False
  35. 30
  36. 150
  37. 60
  38. False
  39. 40
  40. 50

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