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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 389 · 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.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  2. 2.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle − 10
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
  7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  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 left (b) points up and right (c) points right (d) points up and left
  10. 10.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  13. 13.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  14. 14.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
  15. 15.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 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 left (c) points up and left (d) points right
  21. 21.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
  22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  24. 24.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  25. 25.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  30. 30.🦾 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 straight up (b) points left (c) points right (d) points up and left
  31. 31.🦾 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 up and right (b) points straight up (c) points up and left (d) points right
  32. 32.⚙️ 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
  33. 33.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo moves from 0° to 30°. How many degrees does it turn?

Answer key

  1. True
  2. False
  3. a DC motor
  4. a DC motor
  5. 130
  6. 70
  7. a servo motor
  8. False
  9. points up and right
  10. 100
  11. 300
  12. 200
  13. 10
  14. 180°
  15. False
  16. a servo motor
  17. a servo motor
  18. a DC motor
  19. 70
  20. points straight up
  21. 10
  22. 80
  23. a DC motor
  24. False
  25. True
  26. a servo motor
  27. True
  28. a DC motor
  29. 50
  30. points up and left
  31. points right
  32. a DC motor
  33. True
  34. False
  35. 30
  36. 30
  37. 60
  38. False
  39. False
  40. 30

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