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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 892 · 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 drives the wheels? (a) a DC motor (b) a servo motor
  2. 2.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 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 left (b) points straight up (c) points left (d) points right
  4. 4.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ 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
  7. 7.🦾 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 up and right (c) points left (d) points straight up
  8. 8.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
  9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  10. 10.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  11. 11.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
  12. 12.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
  13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  17. 17.🦾 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 straight up (b) points left (c) points right (d) points up and right
  18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  20. 20.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  24. 24.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
  27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  30. 30.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
  31. 31.🦾 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
  32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  33. 33.⚙️ 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
  34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  35. 35.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
  36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  39. 39.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 20
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. 40
  3. points straight up
  4. 40
  5. True
  6. a DC motor
  7. points up and right
  8. 40
  9. True
  10. True
  11. 80
  12. swap its two wires
  13. False
  14. False
  15. a DC motor
  16. 300
  17. points right
  18. False
  19. 180°
  20. 10
  21. a servo motor
  22. 150
  23. a servo motor
  24. True
  25. 40
  26. 130
  27. a DC motor
  28. a servo motor
  29. False
  30. 70
  31. points left
  32. a DC motor
  33. a servo motor
  34. True
  35. 110
  36. 150
  37. a DC motor
  38. False
  39. 30
  40. 100

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