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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 605 · 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 up and right (b) points up and left (c) points right (d) points straight up
  2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  4. 4.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  5. 5.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  9. 9.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
  11. 11.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  12. 12.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
  14. 14.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
  16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  18. 18.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  19. 19.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
  20. 20.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
  21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
  22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  24. 24.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  29. 29.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
  30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 10
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  35. 35.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 30
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 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 straight up (d) points up and right
  37. 37.🦾 A servo moves from 180° to 130°. How many degrees does it turn?
  38. 38.🦾 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 left (b) points right (c) points up and left (d) points straight up
  39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. points straight up
  2. a DC motor
  3. False
  4. True
  5. swap its two wires
  6. 50
  7. a DC motor
  8. a servo motor
  9. 0
  10. 30
  11. 60
  12. 140
  13. 50
  14. True
  15. a servo motor
  16. 50
  17. 80
  18. False
  19. 150
  20. 80
  21. a DC motor
  22. a DC motor
  23. a DC motor
  24. 180°
  25. 150
  26. a servo motor
  27. True
  28. 100
  29. 170
  30. False
  31. a servo motor
  32. False
  33. 50
  34. a DC motor
  35. 30
  36. points up and right
  37. 50
  38. points up and left
  39. False
  40. 180

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