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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 34 · 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 DC motor (b) a servo motor
  2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  8. 8.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 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 left (c) points straight up (d) points up and right
  10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
  12. 12.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  13. 13.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
  14. 14.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  15. 15.🦾 A servo moves from 170° to 120°. How many degrees does it turn?
  16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 30
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  22. 22.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  24. 24.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
  25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  27. 27.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 10
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  29. 29.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  33. 33.🦾 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 right (c) points straight up (d) points left
  34. 34.🦾 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 straight up (b) points right (c) points left (d) points up and left
  35. 35.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
  36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
  40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

Answer key

  1. a DC motor
  2. a DC motor
  3. 180°
  4. True
  5. 150
  6. a DC motor
  7. a servo motor
  8. 30
  9. points right
  10. a servo motor
  11. a DC motor
  12. True
  13. 40
  14. False
  15. 50
  16. 100
  17. 200
  18. 70
  19. movement
  20. 60
  21. False
  22. False
  23. a DC motor
  24. 20
  25. False
  26. 50
  27. 170
  28. True
  29. False
  30. a servo motor
  31. 90
  32. a DC motor
  33. points left
  34. points straight up
  35. 10
  36. 60
  37. False
  38. False
  39. 70
  40. a servo motor

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